Re: 57 truck brake issue
What are the pressure ratings of your valves? For disc they should be 2 PSI. Are you sure they are pointed in the right direction? Is this a new set up? Are you sure you have no pinching or folding points on your brake lines during suspension compression? Is your pedal returning all the way to the top after you use the brakes? What is the condition on the calipers? Are they clean and have free movement of the piston, meaning no chance of jamming in the out position?
Just some things to check.
Rob
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