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Re: Proportioning valve problem?
Quote:
Originally Posted by Steeveedee
DO NOT have someone put "a little pressure" on the brake pedal with the drum(s) off. One (or both) wheel cylinders will pop and leak, guaranteed. Then they will need to be rebuilt.
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That's probably good advice, although it happened accidentally when I was a kid w/o too much drama. 
I just now remembered that yesterday when my buddy stepped on the pedal with the bleeder valves closed, the drums would no longer turn by hand. So that means the wheel cylinders are working at least somewhat, but there's still a pressure problem based on minimal shoe wear and how slowly fluid flows out of the bleeder valves.
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Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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