Checking and adjusting axle load-dependent brake (ALB) · ar4280d1600f · Mercedes-Benz WIS

AR42.80-D-1600F

Checking and adjusting axle load-dependent brake (ALB)

13.1.10

MODEL XD1, XD2, XD3, XD4, XD5, XD6, XD7, YD1, YD2, YD3, YD4, YD5, YD6, YD7

MODEL 903.61 /66, 904.61 /66 with CODE (ZU7) National version for Canada

MODEL 903.61 /66, 904.61 /66 with CODE (ZU8) National version for USA

MODEL 903.61 /66, 904.61 /62 /66 with CODE (ZU9) National version for Mexico

Checking and adjusting axle load-dependent brake (ALB)

D42.80-0007-05

1 Hydraulic unit

2 Master brake cylinder test connections

3 Reservoir

4 Twin ALB controller

5 Left twin ALB controller test connection

6 Right twin ALB controller test connection

Shown on model WD2YD241

D42.80-0006-01

D42.80-0005-01

2 Master brake cylinder test connection

5 Left twin ALB controller test connection

6 Right twin ALB controller test connection

	Checking
Danger!	Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.	Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
		It is not possible to repair twin controllers.
		Always replace controller if not functioning correctly or if defective.
	Notes on adjusting axle load-dependent brake		AH42.80-N-0001-01A
1	Check actuation of axle load-dependent brake	If necessary, replace plain bearings.	AR42.80-D-1603-02A
		Deflection play	*BE42.80-N-1002-01A
		Long-term grease	*BR00.45-Z-1001-06A
2	Check actuating lever of twin ALB controller		AR42.80-D-1603-04A
3	Connect pressure gauge at master brake cylinder test connection (2)
4	Connect pressure gauge at test connection for right rear brake caliper (6) at twin ALB controller.
5	Bleed both pressure gauges
6	Checking brake pressure of ALB controller		AR42.80-D-1600-01A
			*000589183100
		Inlet pressure	*BE42.80-N-1001-01A
7	Disconnect pressure gauge at test connection (6)
8	Connect pressure gauge to test connection for left rear brake caliper (5) on twin ALB controller
9	Bleed pressure gauge
10	Checking brake pressure of ALB controller		AR42.80-D-1600-01A
			*000589183100
		Inlet pressure	*BE42.80-N-1001-01A
11	Compare outlet value for right rear brake with outlet value for left rear brake.	 If variation of outlet pressure between left and right is greater than the permitted tolerance 	*BE42.80-N-1001-01A
		Replace twin ALB controller.
12	Adjust ALB controller		AR42.80-D-1603-01A
			*385589052100
13	Disconnect pressure tester.
14	Bleed brake system	 After testing, only bleed brake calipers to which the pressure tester was connected.	AR42.10-D-0010B
15	Check fluid level in reservoir and correct if necessary
			AP42.50-D-4210B
16	Check brake system for leaks

Test and adjustment values for ALB controller

Number	Designation			Model WD1/WD2/ WD3/WD6/ WD7/XD1/ XD2/XD3/ XD4/XD5/ XD6/XD7/ YD1/YD2/ YD3/YD4/ YD5/YD6/ YD7


BE42.80-N-1001-01A	ALB controller pressure test	Inlet pressure	bar	100
		Maximum variation of outlet pressure between left and right	bar	6
BE42.80-N-1002-01A	ALB controller linkage	Maximum deflection play of actuator rod	mm	15
		See picture		AR42.80-D-1603-03A

Test and adjustment values for ALB controller

Number	Designation			Model 690.611/63/64, 901, 902, 903	Models 690.612/613, 904, 905 with code BB0


BE42.80-N-1001-01A	ALB controller pressure test	Inlet pressure	bar	100	100
		Maximum variation of outlet pressure between left and right	bar	6	6
BE42.80-N-1002-01A	ALB controller linkage	Maximum deflection play of actuator rod	mm	15	15
		See picture		AR42.80-D-1603-03A	AR42.80-D-1603-03A

000 589 18 31 00

385 589 05 21 00

Test balance

Brake pedal jack

Repair materials

Number	Designation	Order number
BR00.45-Z-1001-06A	Long-life grease	A 000 989 63 51 11

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