Servo braking system defects - Causes :

MASTER-VAC brake servo for 1000 - 1500 naturally aspirated engines Fig. I

Conventional brake servo (with one compartment A)

The thrust rod is set back with reference to the master cylinder mounting face by . 0.3 to 0.5 mm

Diameter … 8" (203.2 mm)

MASTER-VAC brake servo for 1800 - TURBO vehicles Fig. II

Tandem (two compartments A')

This unit operates on exactly the same principles as those of the conventional MASTER-VAC brake servo.

WARNING : The thrust rod (5) is adjusted at the factory. It is forbidden to re-adjust it under repair conditions

Diameter … 8" (203.2 mm)

Servo braking system defects - Causes :

• Leakage into the vacuum pipe between the inlet manifold (Petrol engines) and the valve (1) or between it and the exhauster (Diesel Engine).
• Leakage at valve (1) or seal (2).
• Fouling up of the filter (3) on the atmospheric pressure input.
• Leaks in the diaphragm or diaphragms (4).

On the J5 Diesel, a PIERBURG exhauster provides vacuum for the brake servo.

Exhauster oil capacity … 40 cm³

Oil grade … SAE 10 W 30