Reoccuring air in brake lines

[smutts]

i bet anything its sucking past the seals in the prop valve

So no chance of it being the (much!) cheaper wheel cylinder.........

[R.O.R-2.0]

i bet anything its sucking past the seals in the prop valve

So no chance of it being the (much!) cheaper wheel cylinder.........

every issue ive had was from the prop valve..

[smutts]

Well, just to be awkward, the brakes have decided to behave themselves the last few weeks, but as I do a lot of driving over Dartmoor with lots of 25% grades, bends, stone walls, wild horses and the sheep like to sleep on the road at night, it will just be a matter of time.............

[pointynoggin]

Well i changed the master cylinder and the prop valve with no effect.  Guess I will change the rear pistons and pads now.

One other note,  when i press,the peddle during bleeding it clicks halfway down, loudly if i am pressing hard.  What is the deal with that?

[smutts]

when i press,the peddle during bleeding it clicks halfway down, loudly if i am pressing hard.  What is the deal with that?

Tandem master cylinders do that. The fluid pressure from your foot pressing the pedal presses fluid into one circuit, and the pressure also pushes a dumb piston that pressures the second circuit. The sound is the foot piston clunking against the dumb piston, as the fluid that usually passes the force is flying out of your bleed nipple. Clever, because if your pipe bursts, once the fluid has gone, you still have some brakes. My very old land rover doesn't have this and will simply carry on to the accident. 

[pointynoggin]

thanks, that is good to know