SHOP MANUAL
HYDRAULIC
Ch 5 page PB Ch 5 page 60
HYDRAULIC
Parking brake, description
The parking brake is spring actuated, hydraulic released, self adjusting, single disc brake mounted at the fixed
propeller shaft in rear chassis.
Operation
When the parking brake switch, is switched to the “on” - position, the parking brake accumulator, charged by
the hydraulic pump is closed by the solenoid valve and park brake oil is returned to tank.
When the parking brake oil is drained, the park brake light switch is disconnected and park brake light on dash-
board disconnects.
With the Park Brake Switch in the off position, the solenoid valve allow pressurised oil to compress the spring in
the brake chamber to keep Park Brake in the off position.
If for some reason the Park Brake oil pressure drops below approx 108 bar the spring force will apply the Park-
ing Brake as an emergency brake. The warning light come on at 110 bar.
1
2
3
4
5
6
7
8
9
10
11
1 Chamber
2 Spacer
3 Pin
4 Cotter pin
5 Spacer
6 Lining assembly
7 Spring
8 Retaining ring
9 Cotter pin
10 Washer
11 Adjuster plug
Figure 46
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