I Had a problem with rear brakes........ check this out

https://www.dieselbombers.com/1st-ge...ar-brakes.html

 

i was looking at the 70 i got today and i forgot you have to remove the hub assembly to ge tthe drum off. easy if you know hwo to do it and have the hubnut tool. bu if notbe a it can pain if youve never done one

 

If your front s work and not the. Back it's not your wheel cylinder

 

that isnt necesarily true. if its a 2 piece master cylinder it controls them individually. on ym chevy i had the rears completely disconnected for a long time and the fronts still worked.

but with the proportioning valve dodge uses, it could allow pressure to be held up front but not in the rear, since the valve distributes the brake power

 

It's non abs. And the master cyl has 2 resiviors... I think that's why I have fronts and no rears... The rears resiviors goes empty right away as fast as I can pump the pedal

 

Did you ask the shop for a quote?

 

have someone pump the pedal after filling it up, and find that brake leak, it wont just disappear. trace down where its leaking and youll be fine

 

Normally, the price range of a wheel cylinder is from $20-$30.. And replacing it is just a DYI..