Service and parking brake - function test

AP42.00-T-4255C

Service and parking brake - function test

1.3.00



Check



Service brake

1

Switch ignition on

2

Check operating pressure, function of "operating pressure " indicator lamps (1, 2) and function of "STOP" fault indicator lamp (7).

 If (optional) gauges are present for brake circuits I (3) and II (4), the supply pressure must appear in the display.

The indicator lamps must switch on.

 If the supply pressure is under 5.7 bar then the warning buzzer should also be activated.

Danger!

Risk of accident from vehicle starting off by itself when engine running. Risk of injury from contusions and burns if you insert your hands into the engine when it is started or when it is running

Secure vehicle to prevent it from moving off by itself.
Wear closed and close-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

3

Start engine

 If the supply pressure is over approximately 5.7 the indicator lamps must be off after starting.

 If the "STOP" fault indicator lamp remains on, a fault has occurred not relating to the brakes.

4

Reduce the supply pressure below 5.7 bar by applying the brakes several times

Only if supply pressure exceeds 5.7 bar.

 Indicator lamps and buzzer switch on.

5

Apply the service brake and ask an assistant to observe whether the movement at the brake levers on the wheel brakes (8) is correct

6

Switch off engine



Parking brake

7

Switch on ignition

8

Check function of "parking brake" (6) and "parking brake service pressure" (5) indicator lamps

Danger!

Risk of accident from vehicle starting off by itself when engine running. Risk of injury from contusions and burns if you insert your hands into the engine when it is started or when it is running

Secure vehicle to prevent it from moving off by itself.
Wear closed and close-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

9

Start engine

 Once the supply pressure exceeds approximately 6.2 bar the "parking brake air pressure" indicator lamp is switched off.

10

Actuate the parking brake until the service pressure of the parking brake drops below approx. 6.2 bar

Only if operating pressure for parking brake is in excess of approx. 6.2 bar.

 "Parking brake operating pressure" indicator lamp comes on.

11

Release the parking brake and have an observer watch the motion of the rear brake levers (9) to ensure that they operate properly

 "Parking brake" indicator lamp must be off.

12

Check the emergency release device of the spring-loaded parking brake

AP42.20-T-4350B