Checking and adjusting axle load-dependent brake (ALB) · ar4280d1600e · Mercedes-Benz WIS

Referenced documents

AR42.80-D-1600E

Checking and adjusting axle load-dependent brake (ALB)

23.11.09

MODEL WD1, WD2, WD3, WD6, WD7

MODEL 903.67 with CODE (ZU7) National version for Canada

MODEL 903.67 with CODE (ZU8) National version for USA

MODEL 903.67 with CODE (ZU9) National version for Mexico

Checking and adjusting axle load-dependent brake (ALB)

D42.80-0008-05

1 Right rear brake caliper bleed screw

2 Left front brake caliper bleed screw

3 Left rear brake caliper bleed screw

4 Right front brake caliper bleed screw

5 (Twin) ALB controller

	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 bushings.	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
3.1	Connect pressure tester to brake caliper at left front and left rear	 Wheels installed.	AR42.10-D-0015-01D
		Pressure tester
	Test connection for testing brake pressure		WF58.50-N-4210-03A
			*BA42.10-N-1002-10A
			*BA42.10-N-1003-12A
3.2	Connect pressure tester to brake caliper at left front and right	 As part of repair work with wheels removed.	AR42.10-D-0015-01B
		Pressure tester
			*BA42.10-N-1002-10A
			*BA42.10-N-1003-12A
4	Check ALB controller brake pressure for left rear brake		AR42.80-D-1600-01A
			*000589183100
		Inlet pressure.	*BE42.80-N-1001-01A
5	Disconnect pressure tester at left rear brake caliper
6	Install bleed screws		*BA42.10-N-1003-12A
7.1	Connect pressure tester at right rear brake caliper	 Wheels installed.	AR42.10-D-0015-01D
		Pressure tester
	Test connection for testing brake pressure		WF58.50-N-4210-03A
			*BA42.10-N-1002-10A
			*BA42.10-N-1003-12A
7.2	Connect pressure tester at right rear brake caliper	 As part of repair work with wheels removed.	AR42.10-D-0015-01B
		Pressure tester
			*BA42.10-N-1002-10A
			*BA42.10-N-1003-12A
8	Check ALB controller brake pressure for right rear brake		AR42.80-D-1600-01A
			*000589183100
		Inlet pressure.	*BE42.80-N-1001-01A
9	Compare outlet value for right rear brake with outlet value for left rear brake.	 If variation in the two outlet pressure values is greater than the permitted tolerance 	*BE42.80-N-1001-01A
		Replace twin ALB controllers.
10	Adjust ALB controller		AR42.80-D-1603-01A
			*385589052100
11	Disconnect pressure tester at front and rear axle
12	Bleed brake system	 After testing, only bleed brake calipers to which the pressure tester was connected.	AR42.10-D-0010B
13	Check fluid level in reservoir and correct if necessary
			AP42.50-D-4210B
14	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

 Front axle brake caliper

Number	Designation			Model WD1/WD2/ WD3/WD6/ WD7/XD1/ XD2/XD3/ XD6/XD7/ YD1/YD2/ YD3/YD6/ YD7	Models 901, 902, 903


BA42.10-N-1002-10A	Bleed screw to brake caliper	M101	Nm	16	16

 Rear axle brake caliper

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

Designation

Model
WD1/WD2/
WD3/WD6/
WD7/XD1/
XD2/XD3/
XD6/XD7/
YD1/YD2/
YD3/YD6/
YD7

BA42.10-N-1003-12A

Bleed screw to brake caliper

ah4200p000301a Notes on repairs to brake system
ah4250p000101a Brake fluid notes
ah4280n000101a Notes on adjusting axle load-dependent brake
ap4250d4210b Hydraulic brake system - checking and correcting fluid level
ar4210d0010b Bleed brake system
ar4210d001501b Connect test line to brake caliper
ar4210d001501d Connect test line to brake caliper
ar4280d160001a Checking brake pressure of ALB controller
ar4280d160301a Adjust ALB controller
ar4280d160302a Check, remove/install axle load-dependent brake (ALB) operation
ar4280d160304a Check actuating lever of twin ALB controller
as4250z000101a Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid
wf5850n421003a Test line for checking brake pressure