CorvetteForum - Chevrolet Corvette Forum Discussion

C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

brake size

Thread Tools
 
Search this Thread
 
Old Jun 3, 2008 | 06:50 PM
Share
  #1  
littleredcorvette88's Avatar
littleredcorvette88
Thread Starter
Racer
15 Year Member
 
Joined: May 2007
Posts: 424
Likes: 0
Default brake size
anybody know the code that is under the arm rest that determines what size the brake rotors are? I have a 91 and im pretty sure that they are 12" in the front and rear but i want to make sure before i buy my new cross slotted drilled rotors thanks
Reply
0
Old Jun 3, 2008 | 07:07 PM
Share
  #2  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
Default
Just make sure there is no J55 code.
Reply
0
Old Jun 3, 2008 | 07:24 PM
Share
  #3  
janarvae's Avatar
janarvae
Burning Brakes
15 Year Member
 
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
Default
I believe the 12 inch rotors are the JL9 option. J55 is the 13 inch HD brakes code, as already mentioned.
Reply
0
Old Jun 3, 2008 | 07:47 PM
Share
  #4  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
Default
Originally Posted by janarvae
I believe the 12 inch rotors are the JL9 option. J55 is the 13 inch HD brakes code, as already mentioned.
My list shows JL9 as anti-lock, I think this could be listed with J55 so may not be a good indication of what brakes are on. I have not comfirmed this though.

JL9 - Anti-lock front and rear disc brakes
Reply
0
Old Jun 3, 2008 | 07:55 PM
Share
  #5  
janarvae's Avatar
janarvae
Burning Brakes
15 Year Member
 
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
Default
Originally Posted by Aardwolf
My list shows JL9 as anti-lock, I think this could be listed with J55 so may not be a good indication of what brakes are on. I have not comfirmed this though.

JL9 - Anti-lock front and rear disc brakes
Yep,

Just checked my '91 FSM on the RPO code page and it says exactly that. Anyone have a J55 factory-equipped car that has the JL9 code on the underside of the armrest? That would solve it.

Jonathan
Reply
0
Old Jun 3, 2008 | 09:12 PM
Share
  #6  
RollaMo-LT4's Avatar
RollaMo-LT4
Race Director
20 Year Member
St. Jude 15 Year Donor
Liked
Community Favorite
 
Joined: Oct 2005
Posts: 11,770
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Default
Originally Posted by janarvae
Yep,
Anyone have a J55 factory-equipped car that has the JL9 code on the underside of the armrest? That would solve it.

Jonathan
My '96 has J55 listed (as the 13 inch front brakes became standard in 1995). But there is no JL9 listed on my RPO codes.

I do believe the JL9 is the code for the standard brakes (12" front). And anti-lock brakes became standard back in 1986.
Reply
0
Old Jun 3, 2008 | 09:14 PM
Share
  #7  
janarvae's Avatar
janarvae
Burning Brakes
15 Year Member
 
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
Default
Originally Posted by RollaMo-LT4
My '96 has J55 listed (as the 13 inch front brakes became standard in 1995). But there is no JL9 listed on my RPO codes.

I do believe the JL9 is the code for the standard brakes (12" front). And anti-lock brakes became standard back in 1986.
Cool, thanks.
Reply
0
Old Jun 3, 2008 | 09:18 PM
Share
  #8  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
Default
Is there a pre-86 code for brakes?
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-1

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-2

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-3

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-4

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-5

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-6

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-7

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-8

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-9

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
Old Jun 3, 2008 | 10:43 PM
Share
  #9  
littleredcorvette88's Avatar
littleredcorvette88
Thread Starter
Racer
15 Year Member
 
Joined: May 2007
Posts: 424
Likes: 0
Default
yea i just checked i have the jL9 code so is this 12 in the front?
Reply
0
Old Jun 3, 2008 | 10:58 PM
Share
  #10  
janarvae's Avatar
janarvae
Burning Brakes
15 Year Member
 
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
Default
Originally Posted by littleredcorvette88
yea i just checked i have the jL9 code so is this 12 in the front?
Correct, they are 12 inches in the front if you have the JL9 code and NOT the J55 code. If you're looking for some easily available rotors, try NAPA, I paid $40 each. If you can wait, you'll be able to find a better deal online or from forum vendors or members.

Jonathan
Reply
0
Old Jun 4, 2008 | 02:05 PM
Share
  #11  
littleredcorvette88's Avatar
littleredcorvette88
Thread Starter
Racer
15 Year Member
 
Joined: May 2007
Posts: 424
Likes: 0
Default
ok thanks a ton
Reply
0

Get notified of new replies

To brake size

Tags
Back to Subforum
C4 Tech/Performance
View Next Unread
FS: 2 Nitrous Throttle Plates, and March Pulleys




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 12:04 AM.

story-0
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-1
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-2
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-3
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-4
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-5
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-6
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-7
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-8
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-9
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE