I have done a diff swap on my 1990 rs drum brakes to a 1989 IROC G92 9 bolt BW 3.42 with discs. I have gotten the cables for the 1989 car and tried them but they seem too long maybe or something isn't right. When I pull the lever it can only be pulled about half way and is really hard to pull. When I pull it as far as I can it still doesn't hold the car on the slightest incline. Anyone know whats going on here?

Thanks
Matt

 

82-89 cars have a tunnel-mounted adjuster, while the 90+ are self-adjusting. IIRC, members who tried the swap you mention also swapped the tunnel-mounted adjuster into their cars. My swap into an 85 IROC required the first-design cable, 1460mm.

BTW, for best brake performance, swap in the correct combination valve.

JamesC

 

The Delco rear brakes also require retrofitting with the recall kit in order to function correctly. If they've been non-functional for a while, the pistons are apt to seize in the cylinders. This is a common problem with them.

 

True. The 89, however, "should" have PBR's.

JamesC

 

Ok thanks for the info. So if I get the tunnel adjuster with the 89 cables I should be good to go? And I did do the valve swap with the diff as well.

 

what does PBR stand for?

 

Pabst Blue Ribbon

 

Apparently I live in the same world as Gumby.

 

The company is Aussi. They make the alum calipers for 89-92 thirdgens.

JamesC

 

back in my day, PBR was a beer also, hehe. thanks to all that took the time to answer my question

 

And cheap beer!