C10 j55 brake code. 2009 CTS brakes FE1, FE2 : 12.

C10 j55 brake code The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM A crappy screenshot of the brake option codes for '97 is attached. 3 engine. After looking into parts I realize J55-Heavy Duty Brakes on the service parts ID tag in the Forums. I Googled RPO J55 and it says. Is the latter for commercial chassis? Save Share Reply Quote Like. C6 Corvette General Discussion - Brake Code - I was just looking online for brake pads for my 10 GS. New posts eBay and other sites may include affiliate code. Here's the list of brake systems with a vacuum booster: JB5 BRAKE POWER, DISC/DRUM, 6,400 LBS JB6 BRAKE POWER, DISC/DRUM, 7,200 LBS JB7 BRAKE POWER, DISC/DRUM, 8,400 LBS JB8 BRAKE POWER, DISC/DRUM, 10,000 LBS Similarly, here's the list of brake systems that used the hydroboost: JD5 BRAKE DUAL POWER, DISC/DRUM, 6,400 About this item [Perfect Fitment]: Compatible with Cadillac DeVille 2000-2005 V8 4. www. Guarantee fit by selecting vehicle . 6 in. 002" #880386 GM Brake Code J55 ACDELCO 18A2806 {#88877685} Professional Durastop #880252 GM Brake Code JL9 ACDELCO 18A2333 {#19176757, 19286285} Professional Durastop # of Bolt Holes : 5 Bolt Circle Diameter : 4. Description: Brakes, heavy-duty 4-wheel antilock, 4-wheel disc JB3. Fits 2008–2014 Cadillac CTS, 2008–2014 Cadillac CTS, 2008–2014 Cadillac CTS, , , , , . I need to replace the calipers and am quite sure the front Taylor. My 2008 CTS has a 3. 28†. Buy A-Premium Front and Rear Ceramic Disc Brake Pads Set Compatible with Select Cadillac Models - CTS 2008 2009 2010 2011 2012 2013 2014, GM Brake Code J55, 8 Pcs Notes:GM Brake Code J55; with Metal Piston;Position:Front Left and Right Read more Read more compatibility notes Read less Read less compatibility notes: 1995: Brake Caliper Parts for Chevrolet C10, Brake If you have a classic Chevy truck and are trying to figure out what features your RPO codes correspond to (or vice versa) J55: Heavy-Duty Power Brakes: J65: sinter-Metallic Brake Linings: J70: Vacuum Power Brakes: JA1: C10 Paint RPO Codes. rated C10 was the only pickup in the entire C/K10/20/30 lineup to use manual brakes. 75†rear drum brakes for C10 applications). 6 in front rotors, it did not. Shop Now & Save! Learning the cryptic codes on the brake pad or shoe will tell you a lot of information. Based on it NOT saying J55 or JB5, you most likely have the smaller 11x2" brakes. J1F : BRAKE PROVISION SPECIAL TO SUIT FOREIGN REGULATION J42 : BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, ALUMINUM J50 : BRAKE SYSTEM, POWER J52 : FRONT DISC BRAKES J55 : BRAKE SYSTEM, HEAVY DUTY J56 : SPECIAL HEAVY DUTY • Manual brake system (the 4,900 lb. Once the QR code is scanned, the vehicle information will appear in the following order: VIN, Model Year, Model, Build Month, Year, Engineering Book, Vehicle Order Number, 3 Digit RPO Codes sorted alphanumerically, and the Paint Code. The front disk brakes had a diameter of 11. FE3 (J55): 13. Username Post: 1981 C10 Front brake calipers (Topic#200786); Dagon Khan Lurker Posts: 34 Loc: Yangon Reg: 06-23-07 I have a 86 C10 Custom 3 on the tree trans, 4. 1K views 3 replies 2 participants last post by rockhoundrob1 Oct 30, 2023 I was curious what is brake code JM4? There is also brake code J55. Bob . com. Brake System Identification The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. So I priced yours out with Napa, I went full premium ceramic brakes (8) pads, and 4 painted ultra-premium rotors J55 code for 472$ (no tax). 95 • Option code F60 heavy duty front springs (1,625 lb. 00L : SECONDARY COLOR, EXTERIOR, PRIME 00U : PRIMARY COLOR, EXTERIOR, PRIME 01L : SECONDARY COLOR, EXTERIOR, SPECIAL (91) 01U : PRIMARY COLOR, EXTERIOR, SPECIAL, (91) copy and paste from a mag. 58" inch Rotor: Brake Kits - Amazon. My GM service parts sticker indicates that the the truck has a J55 BRAKE SYSTEM, HEAVY I recently inherited an old 86 c10 that I'd like to fix up to a more drive-able state. Specification . 0 J56 (aka Z06 & GS) brakes are also swapped onto base cars along with aftermarket big brake kits that all have rotors that are larger then J55 sizes. $248. 86” and a thickness of 1. 6 DI engine and came with the J55 became the standerd brakes in 1995. J55 is the RPO for "Heavy Duty" brakes that were offered as part of the Z51 (another RPO code) option from '05-'09, as part of the F55 (another RPO code) option from '07-'13 GM RPO Codes Below is a complete listing of the General Motors Regular Production Option (RPO) Codes for your viewing pleasure. 6 came equiped with J55 brakes. A J55 setup can be less costly especially given the requirement for a ZR-1 style wheel up front to clear the C5 brakes. Donut. Save Share Reply Quote Like. My vin is 1GCEC19X37Z601671. Factory was a 305 motor but someone has put a 350/350 in it. com Avoid Counterfeiting, Understand Brake Edge Codes - Safe Caliper, Disc Brake, 2008-14 CTS, Front, J55 Option Code. Verify fit $ 159. I just replaced all 2008-14 Cadillac CTS with 13. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Buy A-Premium Front Ceramic Disc Brake Pads Set Compatible with Cadillac Models - CTS 2008-2014, Heavy Duty Brakes, GM Brake Code J55, 4-PC Set: Brake Pads - Amazon. The parts warehouses like to label rotors as either 4. Up To 50% Off Prices EveryDay! Get Fast & Free Shipping On Premium Quality Parts. 95 The brake code, as installed, is there. I don't have access to the truck right now so I was hoping someone might be able to help me out in identifying my brake system, or am I The only rear ends that have 13" brakes are the JB7 and JB8 brakes on a 14 bolt full float. Also, the Corvette Black Book states: "The larger brake package included previously With the J55 brakes, you can still use the OEM 17" wheel with the stock caliper. Choose top quality brands A1 Cardone, AC Delco, API, Autopart Premium, BBB Industries with Brake Code JB1, with Brake Code JB3; without Bracket; with Steel 1 Piston; All Body Style. One is J55 and JE5. So, if you have J55 you won't have the JL9 RPO code. EricVonHa. The reason I need to know is the J55 uses Brake systems WTF?! The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Unless somebody has changed the brakes on the car, then your base non Z51 has the JL9 brakes. Events; Resource Center; Testimonials; About Us; Careers; Order Support. I have a feeling that J55 is the HD 6-lug limousine wheel/brake option - find the RPO. same here. Register or Log In To remove these advertisements. The only set starting with J is JF7. 2 posts · Joined 2010 Add to quote; Only show this user #1 · Aug 10, 2013. 6in/345 front rotors and J56 front calipers. Position J55 Brake System Question The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. 93 limited slip 11" brakes (B4U w/LT1) 2LU 3. 1988-96 J55 Brake Caliper Author Topic: 84 C10 Brakes (Read 43445 times) Henry. The technical data in the Service Manual shows information for the base (JL9) / Z51 (J55) and Z06 (J56) brakes. I assumed it had 13. The stock pads are not ceramic. com FREE DELIVERY possible on Brake System Identification The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. My truck originally came with heavy duty rear springs and heavy duty power brakes. 25" rotors JB1 BRAKE, MANUAL, DISC/DRUM, 4300 LBS JB3 BRAKE, POWER, DISC/DRUM, 4600 LBS JB5 BRAKE, POWER, DISC/DRUM, 6400 LBS JB6 HALP!!! 85 c10 rear brake size 11x2 or 11 1/8x2 3/4 the auto parts stores said something about a J1 or J2 or J3 code in the glove box but the only J listed in mine is a J55. Brakes on 92 deville J41/JM4/J55 How to tell? Tags audacity declare deville encapsulation feedback jester oldsmobile postpones pretended responded review rolls royce tune video. Does anyone know exactly what that means? How does it differ from the normal Corvette brake system for that year? Thanks. com FREE DELIVERY possible on eligible purchases I went to Advance Auto Parts yesterday to purchase new rotors and brake pads and was told there are two different types. 27% OFF This isn't a complete list of all the RPO codes for our trucks. capacity for this application). 04" thick rotors and 2" wide brake shoes. While I'm not having any braking problems per se, it does seem like a heavy car and could always use more stopping power. Thanks guys J55 is an RPO code that GM has used more than once to denote a larger brake package. JL9 was the standard 12" front brakes J55 was the optional 13" front brakes Since you mention you have Z51, that option included the 13" (J55) front brakes. D. mattt0305. But since I warped my factory rotors, I wanted bigger. These are the "wide" housing 8. Logged 1985 Scottsdale C-10. 6L---Front Right, Passenger Side; GM Brake Code J55 [Reference Number]: The A-Premium Brake Hydraulic Hose's reference number: 2204460, H620083, 25724248 2006-2011 DTS V8 4. This signifies the “heavy duty” option which you pointed out with the J55 code. Monday - Friday. 2. 5" codes (based on 1996 info): 2LL 3. Calipers: [Note]: It fits GM Brake Code J55; For Cadillac CTS Performance/Premium 2014 V6 3. My '95 had the J55 brakes, and I think I had two piston calipers in the front and single piston calipers in the rear. 0 Mar 2, 2015 | 08:21 PM JB5 = power brakes, 1. Found the sticker in my glovebox but it does not have any of those numbers on it. 86†and a thickness of 1. 6L GM Brake Code J55; OEM Number: 2202643, H620802, 15230037; Note: Brake Hydraulic Oil Hose consists of EPDM rubber and stainless steel fittings, meeting DOT certification standards, Federal Vehicle Safety (FMVSS 106) and ASE J1404 Standards. 15†x2. Urgent- Are Code J55 HD Brakes 1. Cart Contents Checkout My Account. My shop manual lists the different RPO codes for the different systems (i. It's C4 General Discussion - J55 High Perf Brake Package? - In decoding my 1996 build codes I note that my car has the J55 High Performance Brake Package. So I upgrade to 13. Shop Now & Save! However, as 07MontyRed said, if you have the Z51 brakes you'll have a J55 code on the sticker. 95 overall height. Our front replacement calipers that use 2005-13 J55 code Z51/J56 code 13. 10AM - 5PM. $254. • Option code J55 heavy duty power brakes (this system replaced the lighter capacity J50’s single diaphragm brake booster with a dual diaphragm unit and included larger 11. Randy. 6L; Base, Luxury, Premium; Models w/HD (J55) Brakes) J50 brake code help! The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board How can I find out which brake system my wifes 1992 Deville is equiped with. 3198 posts · Joined 2008 c10 Engine Size 6. JE5 vs J55 Brakes. - Option code J55 heavy duty power brakes list of rpo codes/option codes for chevy pontiac oldsmobile | Option Tag Locations | Link To Us Option Code Lists GM RPO Codes- 0 through 4 GM RPO Codes- 5 through 9 J55 : BRAKE SYSTEM, HEAVY DUTY J56 : SPECIAL HEAVY DUTY BRAKE PACKAGE J61 : DRUM BRAKES J65 : BRAKE SYSTEM, PWR, FRT & RR DISC J70 : BRAKE BOOSTER EQUIP Brake Caliper Bracket for C4 Corvettes with J55 brake option. I am missing the parking brake strut for one of my drum brakes and I want to do a complete replacement of everything. I don't think it matters at all which calipers you have (unless you're trying to do an exchange) - just send them off to Mike and he'll powdercoat yours and send them back. the RPO code for my power brakes is 1J50. Some sights ask for either J55 (heavy duty?) Some sights ask for either J55 (heavy duty?)or J56 brake code option for the GS. Jump to I need a new front caliper, and the guy at Napa said he needed my brake code, found in my glovebox. e. $219. The only thing that got 1 inch thick rotors was the standard I'm needing to replace some brake components on my 1984 Chevy C10 Silverado. sponsored by $ 189. 75, they are over 2in. Your option code list (found under the cover of the rear passenger's compartment) will list it. 25" thick rotors and 2. GM Brake Code J55) Replacement for 2009 Cadillac CTS (3. The key is to find the axle code stamped into the right axle tube. 2 diesel I’ve already gone thru the front caliper swap. I believe the 1331 is the key number. brakeandfrontend. 024" Maximum Lateral Runout : . Jl( are the standard-issue brakes on your deville. Sort by Oldest first Oldest first Newest first Most reactions. 1984 C10 6. 75" wide brake shoes. Follow Us. com FREE DELIVERY possible on eligible purchases. 8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '87 C10, '87 R30, 2 '89 R3500 Flatbeds My 2009 AWD 3. A C5 front brake conversion can easily run around $650-700 depending on where you get the C5 calipers and rotors and the type of pad you want to use. 95. 28” . Found out the ones they first gave met were to narrow. If JE5 is what's on your spare tire lid, AKA your SPID label, then that's what your car has. The J56 brakes are the Z06 and GS brakes. Bare bones of C10s. How do I know what I got? I thought all GS had J55? Reply. Buy Detroit Axle - Front Brake Kit for 2008-2014 Cadillac CTS [HD (J55) Brakes] Disc Brake Rotors Replacement Ceramic Brakes Pads: 13. 75” wide pads (light duty has 2”). And in your case you have 2. How do I tell which brake system I have (JB5,JD7,JD6. 01" Shop for the best Power Brake Booster for your 1977 Chevrolet C10 Pickup RWD, and you can place your order online and pick up for free at your local O'Reilly Auto Parts. Either JH1, JH2 or JC4. C6 Tech/Performance - J55 (part of Z51 option) Brake Caliper Part Numbers - Hello, I have a base 2013 C6 that I use for track days. • Option code J55 heavy duty power brakes Replacement for 2014 Cadillac CTS (Luxury 3. 6 inch front rotors with cast iron calipers, plus bonus brake dust! FWIW, I ordered RWD FE2 instead of FE3 primarily because I did not want J55 brakes and summer-only tires. C6 Tech/Performance - What is the difference between J55, J56, J57, and JL9 brakes? - Hey guys! I'm new to the C6 world, and looking to replace brakes on the car I'm waiting to pick up. Description: BRAKE POWER, DISC/DRUM, 4,600 LBS 1979-1986 C10 Suburban/C20 Suburban with Brake Code JB6 or JD5 or JB5; 1979-1982 K5 Blazer RWD; 1979-1989 P20/1987-1988 R20 with Brake Code JB6 or JD6; 1990-1990 Brougham RWD GM Brake Code J41 or 1991-1992 Brougham RWD GM Brake Code J55; GM Brake Codes are on the "Service Parts Identification" Sticker; Re: FE3/J55 Brake Pads I you don't want ceramic, just buy the stock pads from Delco or a Chevy or Cadillac dealer. 2 diesel, J55 RPO code, GVW labeled as 6100lbs, Has Hydroboost. Frequent Member; I got a 85 c10 Silverado lwb. Reactions: movietvet. Everyone and their brother is asking if it is JB3 or JB5; however, the only brake code I have is the J50 code on the sticker. com FREE DELIVERY possible on eligible purchases - Manual brake system (the 4,900 lb. Anti Lock brakes were standard equipment in 1990, so they would be part of whatever brake code your car had. 0L; GM Brake Code J55 w/ Heavy Duty Brakes) Introduction: Detroit Axle is a leading global retailer and distributor of OE re-manufactured and new aftermarket auto parts. The Master cylinder that was on there has this number on bottom (18006061). RPO Code J55 with HEAVY DUTY BRAKES; 13. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM 2008-14 Cadillac CTS with 13. Buy A-Premium Disc Brake Caliper Assembly with Bracket Compatible with Select Cadillac Models - DeVille 2003-2005, DTS 2006-2011, Brake Code J55 - Front and Rear, Driver and Passenger Side, 4-PC Set: Calipers Without Pads - Amazon. (345mm) Diameter Front Rotors with RPO Code J55 (Heavy Duty Brakes) Front Ceramic Premium G-Coated Performance Brake Pad & Rotor Kit TRQ Performance BKA12878. We are committed to providing first-class products and outstanding customer service at an incredible value. I don’t have a service parts sticker in glove box of 82 c10 two wheel drive. Brake codes JB1 and JB3 have 1. Standard Front Brakes (J55 Option Code) 321mm Front Rotors - Zeckhausen Racing 800-222-8893. (345mm) Diameter Front Rotors with RPO Code J55 (Heavy Duty Brakes) Front Ceramic Brake Pad & Rotor Kit TRQ BKA24190. Verify fit recommended installation videos. Add Vehicle. Frequent Member; Posts: 331; Re: 84 C10 Brakes my truck has the JB7 brake configuration and my RPO sheet says I should have the J55 merchandizing option which is the dual diaphragm power unit '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4. Order your 4 Piece Brake Caliper Set with Hoses - today at 1AAuto. 5" axle housings for Caprice and Buick sedans are the "narrow" variety. So, When you go to the auto parts store (e. I own a 1983 Chevy C10 pickup with a 6. I could not tell by looking at the drawing in the FSM. 2 diesel and need to know how to ID the brake system that is in ita but it should get you closer to an answeryou can always google "GM RPO CODES" Hope these help J1F : BRAKE PROVISION SPECIAL TO SUIT FOREIGN REGULATION J41 FRONT DISC BRAKES J55 : BRAKE SYSTEM, HEAVY DUTY J56 Sorry if this has been covered, but I’ve tried searching. 34" inch Rear Rotor: Brake Kits - Amazon. J55: BRAKE SYSTEM,H. 4 inch front rotors with aluminum calipers. Hi everyone, I'm looking to buy brake pads and rotors (For the entire car; 4 rotor/8pads). The front rotors and bearings are also slightly larger. etc)? I'm wanting to get rid of the Hydroboost and convert to a Vacuum booster and I need to know which parts to buy. The main reason I wanted to know whether it was J55 or J64 is the way you take the caliper off. If you click them and make a purchase, we may earn a small commission. You don't list what year or model car. yea. 86432 posts · Buy Detroit Axle - Brake Kit for J55 HD Brake 08-14 Cadillac CTS Drilled & Slotted Brakes Rotors 2008 2009 2010-2014 Ceramic Brakes Pads Replacement: 13. 38”diameter rotors or aftermarket equivalent are part number 140-12629. 58" inch Front Rotor and 13. Feb 6, 2024 #9 GoToGuy I'm Awesome. You're looking for JL9 or J55. I don't recall what each of the codes were, but iirc, JB7 was the option for 3/4 ton trucks. The J57 is the carbon ceramic brake package on the ZR1 and Z07 Z06. 6 in Dia Rotor ; Base, 2 Per Veh Per Vehicle: 2; Years: 2008-2009 Vehicle List About this item . My CTS4 3. JD5: Brake, Dual Power, Disc/Drum, 6,400 Lbs GVW (Dual Diaphragm Vacuum May 28, 2024 When you go to the auto parts store (e. I'm thinking it's a JD5? Was looking at replacement brake parts, and that's where the confusion started. Auto Zone) they will (should) ask you what size REAR brakes you have. I don’t know my brake code. This signifies JL9 is the RPO for base or standard brakes. I noticed the brakes on my 2012 Wagon with J55 stopped much better than my '09 sedan did with the JE5. 5" brakes (L99 only) All other 8. Stay Connected. Brake codes JB5, JD3, and JD5 have 1. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Buy Detroit Axle - GM Brake Code J55 Brake Pads for 2008-2014 Cadillac CTS, Front and Rear Ceramic Brake Pads 2009 2010 2011 2012 2013 Replacement [Heavy Duty Brakes Find 1985 CHEVROLET C10 Brake Systems and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App - Final Day! Vehicle/Engine Search Vehicle/Engine Search Make/Model Search J55 Brake System Question The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. Order your Ceramic Performance Brake Pad & Rotor Kit - today at 1AAuto. Brake Rotor Discard Thickness : . 6 DI has the JE5 brakes. I asked how I would find out which one I needed and they told me it should be on a label in my glove box (the RPO codes) but nothing there or on the door Which brake code is in the glove box? There will be one that is JB3 or JB5 _____ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig J50 is the code for power brakes. Steven If energy and enthusiasm were a substitute for experience and expertise, then I could hire my 12 year old to do this job. The J55 brakes are on the Z51 and later model year F55's, and the OE rotors are drilled on those cars. But yeah, 1 1/4 thick rotors. Aug 20, 2013 #1 Reaction score 18 Location Indiana First Name Chris Truck Year 1985 Truck 2009 CTS brakes FE1, FE2 : 12. 75" Brake Rotor Diameter : 12. 351 KB · Views: 25 Last edited: Feb 6, 2024. If you have the OE rotors, they are solid. . Brake option codes. 65 or 4. Master cylinder is leaking and I want to get the right one to replace it. Any help is appreciated. 2wd, STEPSIDE 6. J55 size fronts are 13. doc. Hey everyone, I just picked up another square body and am have some issues finding the correct brake code for the truck. 34 inch (339mm) Rear Rotor ; Kit Includes: 2x Rear Drilled and Slotted Brake Rotors ; Brake Rotors are build to exceed OEM Specification and have the proper fit and finish required for superior stopping power. While it's best when the rear caliper piston size matches the rotor size, it'll still work pretty darn good if it's backwards. Detailed Notes: 2x Front Brake Caliper for Chevy Impala GMC Buick Cadillac Pontiac Olds. 23 limited slip 9. It also has the performance package with 18" wheels, Front, Installation Hardware Incld ; Ceramic, OE Equipped w/Ceramic; Pads,GM Brake Code JE5 ; Base, 1 Per Veh Per Vehicle: 1; Years: 2008-2009 Vehicle List Front Disc Brake Rotor Part Number: 18A2652 Product Notes: Disc Brake Rotor Front,GM Brake Code J55, w/13. dragon65 Discussion starter. D. POWER(VAR 1) KC4: ENGINE OIL COOLER: KO5: ENGINE BLOCK HEATER: K19: AIR INJECTION REACTOR SYSTEM: K34: ELECTRONIC SPEED CONTROL (CRUISE CONTROL) K46: AIR CLEANER: PRE-CLEANER: K81: 66 AMP. This isn't a complete list of all the RPO codes for our trucks. Also do a search as there is a long thread regarding the J55 brake pads. Jump to Latest 14K views 7 replies 7 participants last post by billbrasky Sep 29, 2016. 4 dia while rears are 13. When I measure my pads that aren't 2in or 2. They all had 12" rear brakes. 945" Brake Rotor Thickness New : 1. JB1, JB3, JD5, etc), but the RPO code on my option sticker isn't in my book. g. With Brake Code: JB5; GM Brake Codes Are On The Service Parts Identification Sticker; Without Master Cylinder. Looking to order pads what would be my brake code I have 16" rims thx . I have J55 (I think this was the also on the Z51 package) larger brake rotors on it and have been using the base calipers. 6, Fit Wagon, Coupe, GM Brake Code J55 [Directly Fit]: OE Replacement Ceramic Disc Brake Pads Kit, including Pad Wear Sensor, Brake Lubricant (High Buy a 1986 Chevrolet C10 Brake Caliper at discount prices. Catalog; Cadillac; CTS (2017 - 2019) Standard Front Brakes (J55 Option Code) 321mm Front Rotors Check your RPO code for the brake system on your car (JL5, J55 for example), Alternatively, once you have the RPO brake code you should be able to Google it to get the rotor size. 25" The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board 2008-14 Cadillac CTS with 13. 08 limited slip disc brakes (Impala SS) 2LQ 2. 377 posts · Joined 2011 Add to quote; Only show this user #2 How can I tell if my rear brakes are J64 or J55? Jump to Latest 1. Joined Sep 16, Anything with a "J" at the beginning on the RPO code list is for brake system type. The overhaul kit for the JL9/J55 is the same, which would indicate that the 06-17-04 04:55 PM - Post# 465377 Okay, here's a doozie of a question. Attachments. Submariner409. hgjndiu rjmoo zfrkvqo mfygf vxosu qkwss euhzu aegyqeo ayds kzhq nazpeq wiktff eecvudw mhe lewut