1970 bmw 2000

--------------------------------------------------------------------------------

Hi guys thought I would try this thread for advice or be pointed in the right direction.

Recently my young mechanic suggested I fit discs to the rear of my classic BMW Ok all good except after a few brake applications pressure seems to build up and the pedal becomes fairly hard it seems the calipers (must be the rear as front fitted standard) are not returning the brake fluid and brakes not jamming but certainly on a little. It makes me think of the old days where a blocked compensating port gave you a hard pedal.

Would appreciate any thoughts or directions.

Just a quick thought:
On a Mercedes in the mid 60ies, they also had the front disk, rear drum arrangement.

HOWEVER: Calipers and brake drum wheel cylinders I believe work on different tensions/pressure, and different release current (??).
There is a valve that regulates the rear pressure in the system, located (on the Mercedes's) under the rear center of the car before the lines splice to right or left.
I would bet something similar is built into the BMW system and this young Mechanic of yours, may have not have removed this, therefore the ...........

Just a wild guess.

It would be nice to hear back , right here, if that or any other cause was found and the issue was resolved !!