37A-55
MECHANICAL COMPONENT CONTROLS
Brake servo: Check
37A
CHECKING THE SEALS
a When checking the brake servo seals, ensure that
there is a perfect seal between this and the master
cylinder. If there is a leak here, replace the seal (A) .
The brake servo seals must be checked when fitted
on the vehicle and when the hydraulic circuit is oper-
ational.
a Connect thebetween the brake servo and the vacu-
um source (inlet manifold) with a « T » union and the
shortest possible pipe.
a Let the engine idle for approximately 10 minutes.
a Press the pipe between the « T » union and the vac-
uum source using the (Ms. 583) (1) .
If the vacuum drops by more than 33 mbar in 15 se-
conds, there is a leak either:
-at the non-return valve (replace it),
-at the pushrod diaphragm (if this is the case, you
should replace the brake servo).
If the brake servo is not operational, the braking sys-
tem will operate but the force required at the pedal to
obtain the equivalent deceleration as for assisted
braking is considerably higher.
Special tooling required
Ms. 583 Pipe clamps.
3701
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