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Rotor Question

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Old Sep 25, 2007 | 09:57 PM
  #1  
MaSTeRofDZaSTeR's Avatar
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From: "Drive like Hell, you'll get there faster." Tucson AZ
Default Rotor Question

I was wondering what size the front brake rotors should be on a '90. Its not a Z if it makes a difference. The guy at Checker told me they sell em in 2 sizes for the front and one in the back. I dunno if he was full of ****, but he said there's either a 12 or a 13.
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Old Sep 25, 2007 | 10:10 PM
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Code J55 on your RPO list is for the 13" front, stock size is 12" front. The rears are all the same.
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Old Sep 25, 2007 | 10:20 PM
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St. Jude Donor '11-'12-'13
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I ended up putting 13" GS brakes on the front of mine. They work great.
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Old Sep 25, 2007 | 10:27 PM
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Originally Posted by aminnich
Code J55 on your RPO list is for the 13" front, stock size is 12" front. The rears are all the same.


I remember they mentioned J55 when I asked. Would it specify that in the VIN or somewhere on the actual vehicle what the option was? BTW, aminnich my problem with the squeak in the rear from the other post turned out to be brakes afterall. Dunno if its a good thing as it probably cost more.... Pads were practically gone and the rotors needed replacement. They said they would've thought to check the u joints first too but luckily they were fine. Thanks for all your help though man.
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Old Sep 25, 2007 | 10:30 PM
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Originally Posted by FF1wms
I ended up putting 13" GS brakes on the front of mine. They work great.





So I take it it doesn't matter, I can put on which ever one? I assume its a must to have 13s in pairs then at the least. IE both in the front or both in the rear. Did you have to replace all 4 with 13s or you just did the front?
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Old Sep 25, 2007 | 10:31 PM
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Glad I was able to help and that you got it fixed. I think the RPO code list on a 90 model is in the glove compartment, they seem to move it around some from year to year. The VIN # would not show which brake option you have.
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Old Sep 25, 2007 | 10:39 PM
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does the collector edition have the same brake set up as the grand sport
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Old Sep 26, 2007 | 08:33 AM
  #8  
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St. Jude Donor '09
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Originally Posted by zmanz1
does the collector edition have the same brake set up as the grand sport
It sure does....right down to the smallest fitting.
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Old Sep 26, 2007 | 08:51 PM
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St. Jude Donor '11-'12-'13
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Originally Posted by MaSTeRofDZaSTeR
So I take it it doesn't matter, I can put on which ever one? I assume its a must to have 13s in pairs then at the least. IE both in the front or both in the rear. Did you have to replace all 4 with 13s or you just did the front?
Just the fronts. To change to 13" the only thing you really need is the rotors and the caliper brackets. J55 calipers or the GS calipers will work. The GS calipers say Corvette on them. That looks cool through ZR-1 wheels.
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