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rear PBR to Ls1 rear brakes?

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Old 01-02-2011, 08:37 PM
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Car: 1989 IROC-Z
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rear PBR to Ls1 rear brakes?

hello
ive got 12" rear PBR brakes factory, and i want to switch to the ls1 rear calipers because they are smoother [mainly a looks swap] and will look better against c5 front brakes.. what am i looking at to change?

thanks
Old 01-02-2011, 08:51 PM
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Re: rear PBR to Ls1 rear brakes?

Originally Posted by speedmachine
ive got 12" rear PBR brakes factory, and i want to switch to the ls1 rear calipers because they are smoother [mainly a looks swap] and will look better against c5 front brakes.. what am i looking at to change?
Speed, I'm unsure what you currently have (an OE 89 with PBR's would be a 9-bolt, but you mention 3.73 gears which are a 10-bolt gear).

At any rate, the LS1 system is designed for a 10-bolt. The 9- and 10-bolt housing ends have different bolt patterns.

JamesC

Last edited by JamesC; 01-02-2011 at 09:11 PM.
Old 01-03-2011, 10:38 AM
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Re: rear PBR to Ls1 rear brakes?

hmm, i have factory 12" rears on a 9 bolt, but now i have a hybrid 8.8 rear with 9 bolt tubes. at any rate we can just pretend its a 9 bolt which means i need a different backing plate for them to swap. hmmm im gonna search 9bolt with ls1 brakes as see what comes up.
Old 01-03-2011, 11:13 AM
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Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: rear PBR to Ls1 rear brakes?

Originally Posted by speedmachine
hmm, i have factory 12" rears on a 9 bolt, but now i have a hybrid 8.8 rear with 9 bolt tubes. at any rate we can just pretend its a 9 bolt which means i need a different backing plate for them to swap. hmmm im gonna search 9bolt with ls1 brakes as see what comes up.
The backing plate is a part of the LS1 set-up as seen in the following pic:

http://www.flynbye.com/catalog/i60.html

As far as I know, there isn't a 9-bolt plate for that set-up. Should you find anything, please post the results.

JamesC
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