its not the standard ford first pump and it grenades the rear brakes.

if i hit my brakes hard i.e. if a jab the brakes for a deer my rear drums refuse to let go .

the first time it happened i locked the rear end up i n my truck and had to replace the whole rear end.

now ive replaced ALL of the brake hardware from the proportioning valve back .

i came home late last night and slid in the gravel coming down my road and now i cant move again .

can i just bypass the rear brakes by cramming a bolt in the master cylinder?

 

Did you replace the proportioning valve?

Did you completely flush the brake fluid with new fluid from a sealed bottle?

What do you mean by ? "the standard Ford first pump and it grenades the rear brakes"

If your rear brakes are locking up and your trashing the rear end, what size tires are you running?

I suggest posting pictures of both rear brakes the brake lines, flexible brake line etc

perhaps we may get lucky and spot something you missed.

the few things I can think of that would cause rear brakes to lock up are.
A collapsed flexible brake hose at the rear end, water in the brake fluid.

A bad proportioning valve, or a problem with the Antilock braking system if equipped.

Give us more detail so we have a chance to help.

 

every ford ever when the truck sits for a bit the rear drums will try to throw you through the windsheild .. every truck ive ever owned does it .

but i think i narrowed my problem down to a sensor up by my fuel filter .. abs hydraulic sensor ???

i bypassed it with a compression fitting it hasnt done it since.