Check/adjust automatic load-dependent brake (ALB)

AR42.80-G-0050B

Check/adjust automatic load-dependent brake (ALB)

25.10.07



Check

1

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



*385589052100

2

Note down test values specified on ALB plate (1)

 The ALB plate (1) is located on the inside of the left door.

3

Check lengths of control linkage (10) and actuating lever (11)

 If the lengths differ from those specified, adjust the length of the control linkage (10) and actuating lever (11). See the ALB plate (1) for specifications.
Do not adjust the control linkage (10) when setting the pressure.

4

Connect pressure gauge test connections (2, 3)

 The test connections (2, 3) are located next to the battery box.

5.1

Connect pressure gauge to test connections (4, 5, 6)

Model 405.050/100/101/120/121

 The test connections (4, 5, 6) on model 405.100/120 are located in the brake component compartment. On model 405.050/101/121 they are next to the battery box.

5.2

Connect pressure gauge to test connections (7, 8, 9)

Model 405.102/122 up to end no. 197879

 The test connections (8, 9) are located in the front left and right wheel well.

6

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.

7

Fully depress brake pedal

 The pressure gauge of the controlled circuit must come to a standstill within the specified pressure range.
For permissible values, see diagram for the ALB [automatic load-dependent brake system adjustment] on the ALB-plate (1). A deviation of  0.4 bar is permissible. If the pressure deviates significantly, adjust ALB controller.

Adjust

8

Slacken clamp screw (12) on actuating lever (11)

 Brake must be disengaged.

9

Twist shaft (13)

 Twist the shaft (13) until the required setting is reached on the pressure gauge. If the pressure is too low or too high, the shaft (13) must be twisted clockwise or counterclockwise respectively.
Do not twist the shaft (13) more than 90°.

10

Tighten clamp screw (12) and repeat brake application



*BA42.80-N-1001-01D

11

Check adjusting automatic load-dependent brake system setting again, if necessary set again

12

Detach pressure gauge

13

Check brake system for leaks and proper function

Number

Designation

Model
405.100/102/
120/122

Model
405.050/101/121

BA42.80-N-1001-01D

Clamp screw, ALB controller

Nm

10

10