9000 Hatchback L4-2290cc 2.3L DOHC Turbo EFI (1994)
Vacuum Brake Booster: Description and Operation
Without ABS System
Manufacturer: Girling
Type: Vacuum Assisted
Diameter: 203 mm (8 inch)
Power Amplification: 4:1 (at 300 N (66 ft lb) pedal pressure)
The brake servo unit boosts the pressure on the brake pedal exerted by the driver when the brakes are applied. The power supplied by the servo unit is
obtained from the vacuum formed in the engine intake manifold and provides assistance in the ratio of about 4:1. A hose connects the servo unit to the
intake manifold.
The servo unit consists of a metal casing mounted between the brake pedal and the master cylinder and connected to the by pushrods. In the event of a
leak in the servo unit, the two pushrods act as a single pushrod.
The brakes will then work conventionally without servo assistance but much greater pedal force will be required.
Rest (Brakes Off) Position
