Check/adjust automatic load-dependent brake (ALB)

AR42.80-W-0050D

Check/adjust automatic load-dependent brake (ALB)

20.8.12

MODEL

375.1 (except 375.151), 958.0, 970, 972, 974, 975, 976

with leaf spring suspension

Modification notes

3.1.08

Function of automatic load-dependent brake (ALB) changed, added.

BT42.80-W-1000-01A

1

Rear axle combination cylinder test connection

2

Test connection for brake power regulator

3

ALB lever

4

Brake power regulator linkage

5

Test connection for front axle diaphragm cylinder (left and right)

ALB plate (example)



Check

1

Determine rear axle load

Except vehicles with wheel configuration 6x2, 8x2

AR42.80-W-0060A

Only vehicles with wheel configuration 6x2, 8x2

AR42.80-W-0060B

2

Connect test kit

AR42.80-W-0050-01D

 Test kit

*360589002100

3

Fill compressed-air reservoir with air from external source

AR42.60-W-0070B

 Fill to  9 bar.

4

Note down test values specified on ALB plate



Function of automatic load-dependent brake (ALB) changed

BT42.80-W-1000-01A

 The ALB plate is located behind the maintenance flap or in the stowage compartment in the cab.

5

Perform zero-load test

AR42.80-W-0050-02B

 Test kit

*360589002100

If the pressure specified on the ALB plate is not achieved:



Adjust pressure at linkage of brake force regulator (4).

 An extension of the brake force regulator linkage (4) induces an increase in pressure, shortening of the brake force regulator linkage (4) induces a reduction in pressure.

6

Perform half-load test

AR42.80-W-0050-03B

 Test kit

*360589002100

7

Perform full-load test

AR42.80-W-0050-04B

 Test kit

*360589002100

8

Check mechanical through control in service brake valve

AR42.80-W-0050-06A

 Test kit

*360589002100