i have redone the brakes for the front and when i got to the back brakes ,and pulled off the drums it was hard cakey stuff all in there on both sides and the shoes were completely worn and some of the hardware was missing so i replaced the rear wheel cylinders on both sides and the master cylinder but i can get fluid to the front brakes but when i take the bleed needle form the rear cylinders i cant get any fluid back there,i have put the air compressor on the lines to make sure they are all clear and the lines are clear can someone give me info on how i can get get this master cylinder to let fluid get to my rear wheels.........................thanks
2007-03-25 12:05:05 · 5 answers · asked by slick 50 1 in Cars & Transportation ➔ Maintenance & Repairs
whre is the proportioning vavle located
2007-03-25 12:21:23 · update #1
the proportioning valve is not too far from the master cylinder, look to see where all the lines connect coming off the master cylinder, they all go into the proportioning valve, 2 lines will run off it to the front wheels and the other 2 lines will go to the rear brakes, there could be an obstruction in the valve for the rear brakes, you could take both lines out and have someone press the brake pedal and see if it squirts out fluid and if it does hook the lines back up while he is still holding the brake to the floor and then start bleeding your rear brakes like normal, it might take a little while to get all the air out of the rear lines.
2007-03-25 12:38:52 · answer #1 · answered by mister ss 7 · 0⤊ 0⤋
Did you have an assistant helping you with the bleeding process? Remember, you have to close the bleeder screw before the pedal is released after each and every pump of the brake pedal. You also have to remember to stop periodically to keep adding to the reservoir. Seeing that these are the rear brakes, that's a lot of line to get fluid through if you're not patient.
Something's definitely not right here. Is it a new master cylinder? If so, did you bench bleed it first? This is very important!
If you've followed the bleeding process correctly and are still having problems, you could have a bad proportioning valve.
2007-03-25 19:18:06 · answer #2 · answered by Atlas shrugged 1 · 0⤊ 0⤋
I takes time for the fluid to get yo the back, and the valve is just below the master cylinder if you have one on a 1978. The lin goes from the master cylinder into the valve if it goes to the wheels you don't have one.
2007-03-25 19:43:24 · answer #3 · answered by James B 5 · 0⤊ 0⤋
the proportioning vavle is located right under the master it allows your breaks to on at 70lbs. front pressure30lbs rear pressure it alos has steel lines coming out of it
2007-03-25 20:54:08 · answer #4 · answered by oldmanarnie 4 · 0⤊ 0⤋
try and check for fluid before and after the
proportioning valve.be careful not to twist off the lines.they rust and the line will twist.then you will have to change that to.probly be easer than the brakes were.but watch close.
2007-03-25 19:37:29 · answer #5 · answered by a1972chevytruck 2 · 0⤊ 0⤋