Vacuum pump (diesel models only) (Brakes)

Vacuum pump (diesel models only)

As the diesel engine air inlet system does not produce sufficient depression to operate the brake servo assembly, an engine driven vacuum pump is installed. The vacuum pump is integrated with the engine alternator and driven by the accessory drive belt. The pump is a rotary vane type, lubricated and cooled by engine oil supplied through a pipe connected to the centre front of the engine block and returned through a pipe connected to the centre front of the oil sump. Air extracted from the brake servo assembly is vented into the oil sump with returning lubricating oil.

NOTE: Normally, only a small volume of air is drawn from the brake servo assembly. However, a leak in the brake servo assembly or vacuum pipe may cause excessive crankcase pressure.

Vacuum pump installation

1. Alternator
2. Vacuum pump
3. Brake servo assembly vacuum connection
4. Oil feed pipe
5. Oil drain pipe