any guesses

[bpc720]

Hello,I have a 1986 720 2.4L. The brakes on the front wheels locked and would not release so i replaced the master cylinder which didn't help. I then replaced the booster which made a little difference but still not drivable. I then replaced the two front calipers but this also did not fix the problem. I don't know what else the problem could be. anyone got any ideas?

Thanks

[Q451990]

Do the wheels rotate OK when the calipers are removed? My only guess would be that it's not the brakes, but seized or incorrectly torqued front wheel bearings...

Heath

[rsagen]

when did this start to happen?

was the car sitting for awhile or were you just driving it when it did this?

[rioredstang]

Sounds like the rod in the back of the m/c is too long. I don't know how hard the bolts on the m/c are to get to, but when it locks down loosen the bolts on the m/c. If it unlocks then the rod is misadjusted.

[otto888man]

It sounds like you have a bad case of brake hose, that has deteriorated from inside that had become like a one way check valve. I hope this helps. Keep us posted.

OM

[lbreevesii]

^ thats my first guess(assuming they weren't replaced with the calipers)

second would be the maladjusted MC.