brake problem

[tom's dad]

When I brake, the fronts dont apply full pressure and if I am stopping hardish the rears lock up. I have replaced the front pads to try to overcome the problem but no change. The cylinders move in and out easily, no sign of leaks or loss of fluid. I know that it is a dual circuit.
Anyone any idea what is causing this to happen.

Brakes have been fine since a rebuild in 2010, the brake lines being replaced then. Disks look fine.

Any advise appreciated.

Cheers.

[GJR]

Do you know for sure that the fronts are not applying enough pressure or are you assuming this because the rears lock up before the fronts? Could it be a brake bias issue rather than an actual issue with the fronts brakes?

[SSPPGG]

there is a unit in the brake line by the diff, that effects bias to the rear. perhaps that is faulty

[tom's dad]

I dont seem to be able to get the fronts to lock.
Little pedal movement and no spongy pedal, so in that respect they feel fine.

This morning I did a 3 pump bleed to each front. No air seen to be expelled, but brakes now good. Could this point to a slow internal leak in the servo?

[330p4]

Could be master cylinder seals
Ian