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Old Jun 3, 2008 | 06:50 PM
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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
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Old Jun 3, 2008 | 07:07 PM
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Just make sure there is no J55 code.
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Old Jun 3, 2008 | 07:24 PM
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I believe the 12 inch rotors are the JL9 option. J55 is the 13 inch HD brakes code, as already mentioned.
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Old Jun 3, 2008 | 07:47 PM
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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
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Old Jun 3, 2008 | 07:55 PM
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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
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Old Jun 3, 2008 | 09:12 PM
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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.
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Old Jun 3, 2008 | 09:14 PM
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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.
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Old Jun 3, 2008 | 09:18 PM
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Is there a pre-86 code for brakes?
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Old Jun 3, 2008 | 10:43 PM
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yea i just checked i have the jL9 code so is this 12 in the front?
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Old Jun 3, 2008 | 10:58 PM
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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
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Old Jun 4, 2008 | 02:05 PM
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ok thanks a ton
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