Hey guys, I had to replace the rear in my 85' Trans Am and decided I'd upgrade to a 4th gen PBR caliper equipped rear while I was in there. I have the stock MC and proportioning valve. I had read something that said the fluid specs for the PBR calipers were very close to those of the stock drums, and that no further modification would be necessary. Can anyone confirm/deny this?
chazman
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I believe that is correct.
JamesC
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Apr 15, 2026
If you have the OE drum master, you have the correct one.
JamesC
JamesC
That simplifies things a lot. Thanks guys.