Automatic load-dependent brake - check play and adjustment

AP42.80-G-4263C

Automatic load-dependent brake - check play and adjustment

16.8.11



Check

1

Determine rear axle load of vehicle in ready-to-drive condition by weighing

 Test scale

*385589052100

2

Note down test values specified on ALB plate (6)

 The ALB plate (6) is on the inside of the left door (except on model 437.465, where the ALB plate (6) is at a different position depending on the body type).

3

Check that control linkage (7) and operating lever (8) can move easily and that joints are play-free

4

Check length of control linkage (7) and operating lever (8)

 In event of deviation, set length of control linkage (7) and operating lever (8), for details refer to ALB plate (6).

5

Connect pressure gauge to test connection (5)

 The uncontrolled brake pressure must be between 8.1 and 8.4 bar.

6

Connect the pressure gauge to the test connections (1, 2, 3, 4)

7

Pressurize compressed-air system up to cutoff pressure

 Before fully depressing the brake pedal each time, the compressed-air system must be filled until the cutoff pressure is reached.

8

Fully depress brake pedal

 The pressure gauge of the controlled circuit must come to a standstill within the specified pressure range.

Permissible values are given in the ALB setting diagram on the ALB plate (6). A deviation of  0.4 bar is permissible. If the pressure deviates significantly, adjust the ALB controller (subject to separate repair order): 

Check/adjust automatic load-dependent brake (ALB)

Model 437.420/421/425/426

AR42.80-G-0050C

Model 437.430/431/435/436/460/465

AR42.80-G-0050CC

9

Detach pressure gauge

10

Check brake system for leaks and proper function