Service and parking brake - function check

AP42.00-T-4255B

Service and parking brake - function check

21.10.98



Check

1

Switch on electric system

2

Check function of brake circuit 1 service pressure indicator lamp (1), brake circuit 2 service pressure indicator lamp (2), and "STOP" malfunction indicator lamp (7).

 The indicator lamps must be on.
If the reservoir pressure is below 5.5 bar, the buzzer must also be activated.

 If fitted, the displays for the brake circuit 1 service pressure (3) and brake circuit 2 service pressure (4) must indicate the reservoir pressure.

Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns when working in engine during starting procedure

Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

3

Start engine

 With a reservoir pressure in excess of approx. 5.5 bar the indicator lamps must extinguish after starting the engine.

 If the "STOP" malfunction indicator lamp (7) remains on, there is a fault which is not related to the brake.

4

Reduce the reservoir pressure below 5.5 bar by applying the brake several times

 Only if reservoir pressure exceeds 5.5 bar.

 The indicator lamps and buzzer are switched on.

5

Apply service brake

 Except for model 613 with rear axle 746.217

 Ask an assistant to observe whether the movement at the front wheel brake lever (8) or rear wheel brake lever (9) is correct.

6

Turn off engine

7

Switch on electric system

8

Check function of parking brake indicator lamp (6) and parking brake service pressure indicator lamp (5).

Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns when working in engine during starting procedure

Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

9

Start engine

 If the reservoir pressure exceeds 6.0 bar, the parking brake service pressure indicator lamp (5) is switched off.

10

Actuate the parking brake until service pressure of parking brake falls below 6.0 bar

 Only if service pressure of parking brake exceeds 6.0 bar. The parking brake service pressure indicator lamp (5) comes on.

11

Release parking brake

 The indicator lamps and buzzer are switched on. Parking brake indicator lamp (6) must be switched off.