billy050302

I just swapped the rear end out of my 84 z28 from disk/drums to a rear end that has disk/disk. I am not happy with the braking performance. I purchased the right proportioning valve for a disk/disk setup, but is there anything else that needs to be replaced. I have not yet installed the prop valve, I want to make sure I get everything before I start.

built91Z28

You'll have to change the brake lines on the axle itself. The drums have a single flex line going from the body to the axle then hard line going into both drums. The calipers need flex line going into them as well.

JamesC

iTrader: (5)

Make sure that the combination valve you purchased 'looks' exactly like the one in your car--if not, you may have an SAE vs. metric problem where the lines are concerned. I assume the new rear is an 82-88 with Delco-Moraine iron calipers. If it's an 89+ with PBR's, you'll need the 1LE combination valve. Either way, you'll need parking brake cables, and if the new rear has a different gear ratio, you'll need to swap the drive and/or driven gears to make the speedo function correctly.

The following link, toward the bottom, may answer your questions more fully:

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

JamesC

billy050302

Thanks for the link. I wasn't sure if I needed a new master cylinder as well, but the link answered it. I guess it wouldn't hurt to change out a 25+ year old master cylinder anyways.

CaliChevyLover

i thought i heard somewhere the master cylinder needed to be swapped. is this true?

so far i got:

brake lines
ebrake cables
prop valve
(i plan on keeping the same gear ratio)

JamesC

iTrader: (5)

No. The following from the 10-Bolt FAQ I listed above:


If I Swap From a Drum to a Disc Rear End Do I Have to Change the Master Cylinder?
No. https://www.thirdgen.org/forums/brak...fferences.html (Master Cylinder Differences)

JamesC

rs89todd

he would be right on an older camaro but these ones i believe you just have to change the porportioning valve to make it work, i got mine out of a car and grabbed everything i could but the portportionging valve