LR3/Disco 3
GENERAL
Power assistance for the brakes is provided by a vacuum operated brake booster. On petrol models, the vacuum is
produced by the intake manifold and an electric vacuum pump. On diesel models, the vacuum is produced by an engine
driven vacuum pump.
VACUUM PIPES
Plastic vacuum pipes connect the brake booster to the vacuum source. Check valves are incorporated into the vacuum
pipes. On petrol models there are two in-line check valves, to maintain the vacuum in the brake booster when the throttle
is open and the vacuum pump is not running, and prevent fuel vapor entering the brake booster. On diesel models there
is a single check valve integrated into the vacuum pipe connection with the brake booster, to maintain the vacuum in the
brake booster when the vacuum pump is operating at less than the optimum.
Item Part Number
Description
1
-
Vacuum pump
2
-
Brake booster
3
-
Vacuum pipe connection to brake booster (includes check valve)
4
-
Vacuum pipe connection to vacuum pump
5
-
Vacuum pipes
