Heres some backround on what I've done to my 56 GMC 300 dually brakes.I've adjusted up all the brake shoes then I bled the brakes to the hydrovac unit then out to the wheels, furthest one away first.
Here's what happens the pedal will pump up to a good pedal,then when left alone for 30 seconds or mor it'll go to the floor,and will pump back up again.When looking into the brake fluid reservoir when the pedal is left alone there is brake fluid returning to the reservoir and filling it up.It's almost seems like I havn't adjusted the brakes up and the brake springs are pushing fluid back to the reservoir.
Any ideas ?
Thanks
Tim
