Brake Improvements - Looking for thoughts

which potentially means the safety piston/shuttle valve will have flipped in the distribution block switching off the rears, and keeping full pressure available to the front.

most of the time they never move so when they do they can get stuck. there are 2 types one that locks out and the common in the USA one that doesn't.

undoing the collar where the wire plugs into the switch and tapping the unit usually seats the valve back where it should be.

US valves in distribution blocks have no lockout, they should not be getting stuck...! some later units and all used in australia (situated in the side of the girling style master cylinders they use) do have a lock out.
Once that safety piston has moved the only way to click it back is to remove the switch/wire unit by loosening its collar and pulling it out 1/4 inch, then put it back

in these days of globalisation and all stuff made in 1 factory but sold in different boxes
do you have a lockout one.?

US mopar is like a piston and detent ball set up it locks off the problem circuit each time the peddle is pressed.
Australian and some of europe its a piston with grooves and a lock pin end, on the sprung switch with wire to the dash light, that holds the piston in its lock off the rear or lock off the front position

does the red light on the dash work and come on when you press the brakes, that would indicate that the piston is moving to lock off the rears....if it stays on when you don't well the reason for that is explained above... :) (or you have the parking brake on)


Dave