HEEEEELLLLPPPPP !!!!!!!! > I CANT STOP !!!!!!!!

[newyotaowner]

Ok coming home from the movies the other night . ( a-team was funny as hell btw ) . I tried stopping for a red light and my brake pedal went to the floor . pumped it to no avail . i only had about 1/8 inch of pedal until floor . checked master cylinder and it is full . i woke up this morning and went to test my truck to see if i was going to have to tow it to pep boys where i work . well my pedal felt normal . i causiously drove it to work giving my self plenty of room and power braking with my 5 speed . upon inspection the rear axle seal had leaked until it ate the rear shoes to nothing . $311 later i have a new seal . complete new rear brakes and a very solid pedal . well after getting it home i decided to change the front pads since they were low and it would be pointless to have a solid rear end and low front brakes . well after doing that the demon showed up again . very low pedal and almost no brakes . upon pulling into my yard i tried to stop . then heard a thunk . now NO BRAKES !!!!! i almost ran into our patio which would have been very bad and severly damage my truck . ANY IDEAS ???

[Robinhood4x4]

My money is on the master cylinder needs to be replaced. The seals are probably shot.

[partsman93274]

I agree that the master is on its last leg. Even with large amounts of air in the system you would still have some brake pedal travel remaining.

[newyotaowner]

ok changed master cylinder and now brakes are great again . wired part is now that my pedal is like it used to be but slightly higher verses when it first got fixed it was higher . only problem now is the rear proportioning valve has a slight leak ? do i need that part or can i run "old school "brakes and just have the hose go straight to a junction block to the rear brakes

[corax]

you need something to reduce the pressure to the rear brakes or they might lock up before the fronts do. The factory uses a height sensing proportioning valve, if you want to get rid of it you'll need a manual proportioning valve. You'll also need to block off the line from the front hydraulic circuit to the proportioning valve
Here's how I did mine