Check/adjust automatic load-dependent brake (ALB) · ar4280w0050c · Mercedes-Benz WIS

AR42.80-W-0050C

Check/adjust automatic load-dependent brake (ALB)

8.1.08

MODEL 970, 972, 974, 975, 976 with CODE (B02) Brake system, antilock brake system (ABS)
with air suspension

W42.60-0037-06

1 Test connection for left rear axle combination cylinder

2 Test connection for right rear axle combination brake cylinder

3 Brake power regulator connection 4 test connection

4 Adjustable pressure reducing valve with pressure gauge to test connection for brake power regulator, connection 43

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

6 Test connection for left rear axle air bellows pressure

7 Test connection for right rear axle air bellows pressure

8 Test connection for reservoir pressure (adjustable pressure reducing valve with pressure gauge at connection 43)

9 Connection for external air source (min. 9 bar)

W42.10-0011-11

ALB plate

(example)

Modification notes

3.1.08

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

	Function of automatic load-dependent brake (ALB) changed	 Only on vehicles up to 12 t permissible gross vehicle weight and with 3-channel ABS (without ASR).	BT42.80-W-1000-01A
	Checking
1	Connect test kit		AR42.80-W-0050-01C
			*360589002100
2	Fill compressed-air reservoir with air from external source	 Fill up to  9 bar.	AR42.60-W-0070B
3	Note down test values specified on ALB plate	 The ALB plate is located behind the maintenance flap or in the stowage compartment in the cab.
4	Perform zero-load test		AR42.80-W-0050-02A
			*360589002100
5	Perform half-load test		AR42.80-W-0050-03A
			*360589002100
6	Perform full-load test		AR42.80-W-0050-04A
			*360589002100
7	Check mechanical through control in service brake valve		AR42.80-W-0050-06A
			*360589002100

Test kit

360 589 00 21 00