The bore in the wheel cylinder may be scored if so it'll never seal right. Bleed them one at a time. 3 pumps of the pedal, hold, open line. Use clear vinyl tubing so you can see the bubbles.
Wheel cylinders are cheap you may want a new one.
quote:hi i have a 1972 mazda pickup b1600.
the brake pedal is soft and everytime i pump it the passenger front wheel cylinder leaks.
it is drum brakes front and rear.
i have rebuilt the wheel cylinder but everytime i try to bleed the brakes, the wheel cylinder from the passenger front starts leaking again.
is there something im doing wrong?
sorry im not too familiar with a drum brake system so i might be doing something wrong
ive been working with disc brakes my whole life so this whole front and rear drum brake system is relatively new.
just to make sure, since there are 2 wheel cylinders from each wheel do i bleed both bleeder screws from each wheel at the same time??
any advice will be greatly appreciated thank you!!