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  #16 (permalink)  
Old 05-13-2013, 03:52 PM
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This is the setup I am using:


When my pedal is at it's neutral position the booster linkage and pedal pivot are pretty much straight up and down from one another, but I don't think that should make a difference since I have the booster shaft fully extended out in the pedals neutral position.

I also noticed when I apply the brakes with the master cylinder lid off that fluid will jet up from the bottom of the resevior. I take it this is normal?

I noticed in the picture of the GM combo valve below that it says to hold the metering valve when bleeding the front brakes. I have just been bleeding the brakes the conventional way with pumping the pedal. Is this metering valve really necessary to properly bleed the front brakes?


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  #17 (permalink)  
Old 05-17-2013, 01:15 PM
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If your brakes were locking up and then got better after you let the truck sit: you have the brake booster arm (where it goes into the master cylinder) out too far. You have the master cylinder partially compressed causing pressure to build every time you hit the pedal

Reduce the length at least 1 full turn in. They say 1/64" of play is ok but you can have more and still have a good pedal. Regardless, brakes rubbing and locking upward usually the booster arm is too long

Going farther back you said the pedal goes to the floor and you eventually found a leak. That should be the fix. If the pedal still drops then you're still losing fluid somewhere

Fluid squirting up from the master cylinder (with the cap off) is normal.

The combination valve you're picturing would have no effect on bleeding. If its not working properly you'd have hard brakes in the front or rear only. There's a way to test the valve position with a bulb but I don't think it's necessary

Hard pedal with engine off is normal and tells little.

Fix the brake booster rod length first.
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Old 05-18-2013, 01:46 PM
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Are you sure you have the front calipers on the right way. The bleeder needs to be at the top. If it isnt you can bleed them forever and you will never get the air out. I have seen this several times and is an easy mistake to make.
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