Anyone completed this swap (I'm talking about swapping only the brakes, not the entire rear end)? If so, did the newer car have shims in place? Any problems or shortcuts?

JamesC

 

I was curious as to why you were looking to do this. It seems most people on this boards try to do exactly the opposite of what youre trying to do. From what Ive understood, the Delco Moraine brakes on the pre-89 rears were junk and hardly worked properly without a rebuild, plus you'd be downsizing your rotors. Feel free to explain your reasoning. Thanks, Efrain.

 

I want to retro fit the PBR's with 12-inch rotors to an 85 IROC with the D/M brakes without swapping rear ends.

JamesC

 

Here's a GREAT how-to from GMHTP on how they switched to the PBR disc brakes from Baer on their project car's older style disc rearend. All PBRs will be about the same so here's what you'd have to do:

http://www.gmhightechperformance.com...mht_baerfacts/


Ed

 

ebmiller88

Great link!

My question to you now would be this, If I have an 86 or so 10bolt with drums and a 91 10bolt with PBR, all I have to do Is swap parts from the mounting plate out?

thankx

 

And the e-brake cables and the hard lines (unless you mod your own), but essentially , yes. There would be a bit of modding of the drum axle flanges but it's not that bad.

Ed

 

Any further details?

So its not a bolt and go?

 

I got the ebrake stuff, and axle hardlines, you arent talking about the hardlines on the unibody are you?

 

Should be a straight swap. You have to swap the brake hardline on the rear too. The PBR rears used a different bore size MC then the iron rears did.

 

Nope. You'll have to hack the top of the flange off and drill some new bolt holes.

 

Ominous, the drum flange mod is covered in the LS1 brake upgrade tech article section on the homepage. Here's the link with great pics of hos to chop the drum flange:

https://www.thirdgen.org/newdesign/t...reardisc.shtml


Ed

 

he already has a disc brake rear. not a drum rear. so cutting and re-drilling should not be necessary.


he's going from the sucky rear 10.5 discs to the PBR type. not drum to PBR.

 

I responded to his question, not the thread topic.




Ed

 

i totally read over that.