I'm doing drum to disc conversion on my 1990 IROC this weekend. I have PBR calipers, pads, rotors, bracket (from Flynbye), hoses, and e-brake cable. My question is the following: are shims and spacers needed to complete the installation? Thanks

If it's anything like the LS1 PBR (4th gen) brakes I converted on my second gen from drums. I had to mock it up then find out what I needed for spacers/washers to align everything properly.

OK. Thanks.

Primarly what I had to align was the caliper bracket on the passenger side. My driver side was pretty much fine. So I had everyhing assembled without the wheel on and then chekced to make sure everything was straight. I should have given that information before, but didn't think about it. Hope this helps.

I swapped from Delco-Moraines to PBR's. The following link provides pics and part numbers which might prove useful. Also, note the spacers. As I recall I only used one.

https://www.thirdgen.org/forums/faq-...iscs-89-a.html

JamesC

My PBRs installed the same as JamesC (JamesC's ?). One shim (or pair I should say) to centre one carrier over the rotor. .030" in my case.

Thanks. It does helps.

Thanks. I'll check it out.

Cool! Thanks

Where did you get the brackets (the ones attached to the rear end) for the brake hoses?

Never mind. I just finished reading one of your old posts.

i m changing complete rear from 273 drums to 323 posi discs. do i need a different prop valve or any thing else?

Welcome to TGO, jerry.

The following link will provide info on combination valves, master cylinders, and so on.

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC