I’ve read all the available posts regarding binding disc brakes but I do have a small question . I have an XK150 3.8l OTS. Had really bad binding at the front so changed the original calipers etc to Coopercraft replacements. Unfortunately no improvement as the binding is quite severe - very hard to turn the wheel by hand when jacked up.
This is my detail question however. The original workshop manual advises that the Master Cylinder piston / push rod should be adjusted by "slackening off the clevis locknut and screwing the clevis along the rod until free axial movement of 15 - 20 thou ( 0.38 - 0.51mm) is achieved. "
As the clevis needs to be reconnected to the rod I can’t see how the free play can be measured , as the brake pedal is now connected.Is it sufficient to attempt to get the free play ( which is required to allow the piston to release and therefore allow fluid back into the
supply line and hence allow the disc pads to release) by using the pedal stop instead ( or at least just to see if this fixes the binding?) Can the piston / rod actually come out of the master cylinder if the free play is too much? I have seen a number of previous replies to this issue advise that the rod should be able to retract “as much as possible”
Sorry if this is going over old ground but any suggestions would be gratefully received