I would appreciate your thoughts. New caliper fitted to nearside front. Pump the pedal as many time as you like and brake is free. Drive on road and brake as normal and near side brake binding. Release brake pipe at master cyl and free. Drive again on road and same problem. Release two nuts at master cyl and pull away from servo and brake is released. My head is starting to explode with possible theories. Should be able to rule out master and servo as only affecting one brake. When on rollers front brakes rise and fall evenly. Possible abs unit??
Kind regards. Les

Hi Les
Would suspect flexi hose with this sort of fault.


peter

Thanks for your reply Peter. First thing I thought of. For a new caliper the piston is a little stiff to go back. As soon as you slacken the pipe going to the flex hose the piston goes back very easy which I would think should rule out flex hose. Will be back at it tomorrow. Took for 5 mile run today. Wheel free before the run. I did not touch the brake at all through the run and hot and binding when I came back. A couple of theories in my head. I do have a hose standing by but can't see it.
Regards
Les

I have had an issue, Just once in 30 years, of a master cylinder fault that caused just this sort of thing.

Unfortunately, it is not the sort of thing that can easily be tested other than by substitution.

How much/Hard to fit would a new master cylinder be?

Hi Paul. Not hard but expensive and hard to come by. I think you are on the right track. I have had the cyl out already to make sure the plunger was free to move and returning against its stop. i am going to check cyls at rear offside tomorrow to see if they are free to move the fluid back to master. I will keep you posted

Les

Hi.Went for a master cyl and by good luck cured the fault.
Cheers
Les