COMPONENT OPERATION / Axle

Parking Brake

The parking brake is a wet-type spring set hydraulic released multi-disc brake. The brake is released when the parking brake release pressure acts on the oil chamber in the parking brake piston. The parking brake is used in combination with the service brake and is installed in the front axle.

• When brake is applied

When the parking brake switch is set to the ON position, the brake release pressure from the parking brake solenoid valve does not act on the oil chamber in parking brake piston (5). Spring (6) moves parking brake piston (5) to the left so that piston pin (7) is moved to the left. Then, brake disc (2) and brake plate (3) are fitted tightly.

The inner surface of brake disc (2) is splined to shaft (8) through differential gear case (10). The outer surface of brake plate (3) is fixed to axle case (1). Therefore, the rotation of brake disc (2) stops so that the parking brake is applied.

• When brake is released

When the parking brake switch is set to the OFF position, the brake release pressure from the parking brake solenoid valve acts on the oil chamber in parking brake piston (5). Parking brake piston (5) moves to the right so that piston pin (7) is moved to the right by return spring (9). Then, brake disc (2) is freed so that the parking brake is released.

T3-7-10