Block outlets from brake fluid reservoir with two
pointed wooden sticks.
Remove rear left brake hose (34 32 551).
Unscrew brake lines from brake pressure limiter.
Remove brake pressure limiter.
Never attempt to alter the setting of the brake
pressure limiter.


34 32 551

Brake pressure limiter - checking
Connect a high pressure gauge to the front end rear
axle brake circuit and a second gauge to the rear
brake calliper. Depress the brake pedal and hold down
with the pedal prop.

Until a pressure of 20 atü (285 psi) is registered, both
pressure gauges must indicate the same reading.
From 20 atü (285) upwards, the pressure at the rear
fixed calliper should be correspondingly reduced as
shown in the diagram.
A output pressure B input pressure C tolerance range
If the measured values differ from the nominal values,
the repuired rear axle pressure can be set with the
adjusting screw when the brakes are released.
Screw out - increases rear axle pressure
Screw in - reduced rear axle pressure
Prevent the adjusting screw and castellated
nut from turning with Klebert M 28 sealer.