Check/adjust automatic load-dependent brake (ALB)

AR42.80-G-0050UG

Check/adjust automatic load-dependent brake (ALB)

13.11.2018

Model

405.090

Model

405.104/105/110/125/202/222 ## up to 253218

Shown on model 405.090/104

1

ALB plate

Shown on model 405.105/110/125

1

ALB plate

2

Control linkage

3

Actuating lever

4

ALB controller

5

Test connection (brake pressure upstream of ALB, at ALB controller (4))

5

Test connection (brake pressure upstream of ALB, at battery box)

6

Test connection (brake pressure regulated, rear axle)

Shown on model 405.090/104, front right

7

Test connection (brake pressure, upstream of load/no-load valve)

Shown on model 405.090/104, front left

8

Test connection (brake pressure controlled, front axle)



Check

1

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

 Test balance

*385589052100

2

Note down values for "dimension A and dimension B" given on ALB plate (1)

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

3

Check that control linkage (2) and operating lever (3) can move easily and that joints are play-free

4

Check dimensions between the two pivot points of control linkage (2) and operating lever (3)

 If there is a deviation in the dimensions, adjust the length of the control linkage (2) and operating lever (3). See "dimension A and dimension B" on the ALB plate (1).

5

Connect pressure gauge to test connections (5, 6)

 The pressure gauge can be connected to the test connection (5) on the battery box or on the ALB controller (4).

6

Connect pressure gauge to test connections (7, 8)

Only on MODEL 405.090/104

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 until 8.0 bar is present at test connection (5), and hold brake pedal at position

 Read off the value at the test connection (6).
On MODEL 405.090/104, additionally read off the value at the test connection (8).

 The pressure gauge for the controlled brake pressure at the rear axle must remain within the specified pressure range.
On MODEL 405.090/104, the pressure gauge for the controlled brake pressure at the front axle must also remain within the specified pressure range.
Permissible values and tolerances are given in the ALB setting diagram on the ALB plate (1). If the brake pressure deviates significantly, adjust the ALB controller (4).

Adjust

9

Slacken lock nuts on control linkage (2)

 Brake must be disengaged.

10

Adjust control linkage (2)

 Adjust the control linkage (2) until the required setting is reached on the pressure gauge. Pressure too low: Extend control linkage (2). Pressure too high: Shorten control linkage (2).

11

Tighten lock nuts on control linkage (2) and repeat brake application

12

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

13

Detach pressure gauge

14

Check brake system for leaks and proper function