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12-13-2022
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#1 |
 Join Date: Jun 2022
Location: Alpharetta
Posts: 28
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I have the J55 RPO, but pretty sure I have the 12" rotors installed
Need to replace the front rotors/pads/calipers, as I had the car pull to one side during a recent drive. Only happened once, but this kind of issue won't just magically go away.
Looking at my RPO codes, I see J55 listed, which are the heavy duty brakes. Everything I've read, this means it includes the 13" rotors in the front. But I think this car has had the rotors replaced with standard 12" rotors. Pic below of my wheel for reference. Please don't judge too much for the dirty car. If I go to replace everything with the J55 stuff, do the caliper brackets line up, or are things different? Suspension codes are FE1 and FX3, so I do not have the HD suspension. I knew I was having a heck of a time finding the right parts for some reason, and if the HD rotors were replaced with standard rotors, this would make sense. |
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12-13-2022
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: I have the J55 RPO, but pretty sure I have the 12" rotors installed
Yup, at the very least those are the wrong rotors. Without better photos it looks like the Calipers are correct. All ZR-1's had J55 standard..
H 
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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12-14-2022
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#3 |
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Join Date: Jul 2020
Location: Nashville TN
Posts: 323
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Re: I have the J55 RPO, but pretty sure I have the 12" rotors installed
I?d venture to say your brake pads are half hanging off that rotor!
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12-14-2022
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#4 | |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: I have the J55 RPO, but pretty sure I have the 12" rotors installed
Quote:
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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12-15-2022
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#5 |
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Join Date: Jul 2020
Location: Nashville TN
Posts: 323
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Re: I have the J55 RPO, but pretty sure I have the 12" rotors installed
He might just need the right size rotors and pads. Calipers could very well be correct already. that would make this an easy fix.
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