Yeah, they sure can be glad we figured out how to bleed the rear earlier, there's just no room between the backing plate and the spring pack without dropping the diff out…. Gotta say I do love the narrowed cab and chassis dually rears so the pain is worth it for me.
Brakes were really great before the failure but El Rae is gonna stop on a dime again! Ha, maybe as good as this kid on his skate board?
https://www.youtube.com/watch?v=jrRWoo1Wiug
Installed a 4-wheel disc, PV4 (Summit brand) combination/proportioning valve this time around and eliminating the metering valve part that failed so quickly. That particular part of the combination valve slows brake fluid to the front disc brakes for various reasons (softens nose dive, allows the rear drums to get a head start, etc.)
Those who have been following a while may remember we had to enlarge the inner prop valve bore (see the 4th pic) to get the rear brakes to function correctly in the first place. The 3+3 donor had a much larger bore in the main body as well as the prop valve. It’s brake setup ran a secondary ride height prop valve in the rear that we eliminated (
http://67-72chevytrucks.com/vboard/s...&postcount=395).
The PV4 prop valve has a larger inner bore to start with and don’t think it’ll need to be messed with, also adding a Wilwood manually adjustable valve to the rear line this time for some control if needed.