Checking and adjusting axle load-dependent brake (ALB)

AR42.80-P-1600GI

Checking and adjusting axle load-dependent brake (ALB)

19.5.08



Checking

 Danger!

Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.

Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.

AS42.50-Z-0001-01A



Brake fluid notes

All models

AH42.50-P-0001-01A



Notes on repairs to brake system

All models

AH42.00-P-0003-01A

1

Determine the rear axle load and load the vehicle with weights if necessary



*385589052100

2

Connect pressure tester to test connection for unregulated pressure (1).

 On vehicle without test connection, uncontrolled pressure (1) the pressure tester with connection fitting is to be connected to the brake caliper or wheel brake cylinder of the front axle.

Pressure tester (hydraulic single / dual circuit brake systems)

3

Connect pressure tester to test connection for regulated rear-axle pressure (2).

 On vehicle without test connection, rear axle controlled pressure (2) the pressure tester with connection fitting is to be connected to the brake caliper or wheel brake cylinder of the rear axle.

Pressure tester (hydraulic single / dual circuit brake systems)

4

Use the brake pedal jack to apply pressure to the brake pedal, continuing until the pressure gauge indicates an entry pressure of 100 bar in the front-axle brake circuit.



*000589183100

5

Check the output pressure at the test connection, rear axle controlled pressure (2) or the brake caliper or wheel brake cylinder of the rear axle

 If the output pressure deviates from the adjustment pressure, it should be adjusted.

*BE42.80-P-1001-01D

*BE42.80-P-1002-01D

Adjust

6

Adjusting exit pressure

Only carry out if the output pressure deviates from the adjustment pressure.

 Adjust the pressure by extending or shortening the threaded rod (4).
Extending the threaded rod (4) increases the pressure
Shortening the threaded rod (4) reduces the pressure.

 If the range of adjustment at the threaded rod (4) is not adequate, it can be increased or decreased by adjusting the control spring bearing (3) in the elongated hole.

*BE42.80-P-1001-01D

*BE42.80-P-1002-01D

7

Check the output pressure at the test connection for controlled rear axle pressure (2) or the brake caliper or wheel brake cylinder of the rear axle again

Only carry out if the output pressure has been adjusted.

*BE42.80-P-1001-01D

*BE42.80-P-1002-01D

8

Detach pressure tester

9

Bleed brake system

Only on vehicles without test connection for uncontrolled pressure (1) or test connection for rear axle controlled pressure (2).

AR42.10-P-0010GG

 After checking, only bleed the brake caliper or wheel brake cylinder to which the pressure tester was connected.



*BA42.10-P-1001-02B



*BA42.10-P-1001-08A

Number

Designation

Model 463 to 99
Rear axle spring: yellow
Automatic load-dependent brake pressure control spring: yellow/blue

Model 463 to 99
Rear axle spring: white
Automatic load-dependent brake pressure control spring: yellow

BE42.80-P-1001-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 900 kg to
1500 kg)

900 kg

Specified pressure

bar

44 (2)

46 (2)

1000 kg

Specified pressure

bar

50 (2)

50 (2)

1100 kg

Specified pressure

bar

55 (2)

54 (2)

1200 kg

Specified pressure

bar

59 (2)

58 (2)

1300 kg

Specified pressure

bar

63 (2)

62 (2)

1400 kg

Specified pressure

bar

-

-

1500 kg

Specified pressure

bar

-

-

BE42.80-P-1002-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 1600 kg to
2400 kg)

1600 kg

Specified pressure

bar

-

-

1700 kg

Specified pressure

bar

-

-

1800 kg

Specified pressure

bar

-

-

1900 kg

Specified pressure

bar

-

-

2000 kg

Specified pressure

bar

-

-

2100 kg

Specified pressure

bar

-

-

2200 kg

Specified pressure

bar

-

-

2300 kg

Specified pressure

bar

-

-

2400 kg

Specified pressure

bar

-

-

Number

Designation

Model 463 to 99
Rear axle spring: yellow/orange
Automatic load-dependent brake pressure control spring: yellow/blue

Model 463 to 99 load uprating stage 1 and 2
Rear axle spring: lilac
Automatic load-dependent brake pressure control spring: green

BE42.80-P-1001-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 900 kg to
1500 kg)

900 kg

Specified pressure

bar

44 (2)

-

1000 kg

Specified pressure

bar

50 (2)

36 (2)

1100 kg

Specified pressure

bar

55 (2)

40 (2)

1200 kg

Specified pressure

bar

59 (2)

43 (2)

1300 kg

Specified pressure

bar

63 (2)

46 (2)

1400 kg

Specified pressure

bar

-

-

1500 kg

Specified pressure

bar

-

-

BE42.80-P-1002-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 1600 kg to
2400 kg)

1600 kg

Specified pressure

bar

-

-

1700 kg

Specified pressure

bar

-

-

1800 kg

Specified pressure

bar

-

-

1900 kg

Specified pressure

bar

-

-

2000 kg

Specified pressure

bar

-

-

2100 kg

Specified pressure

bar

-

-

2200 kg

Specified pressure

bar

-

-

2300 kg

Specified pressure

bar

-

-

2400 kg

Specified pressure

bar

-

-

Number

Designation

Model 463 to 99
Special protection
Rear axle spring: lilac
Axle load-dependent brake spring: green

Model 463 to 99
Rear axle spring: yellow/orange
Automatic load-dependent brake pressure control spring: yellow/blue

BE42.80-P-1001-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 900 kg to
1500 kg)

900 kg

Specified pressure

bar

-

33 (2)

1000 kg

Specified pressure

bar

-

38 (2)

1100 kg

Specified pressure

bar

-

42 (2)

1200 kg

Specified pressure

bar

-

45 (2)

1300 kg

Specified pressure

bar

-

47 (2)

1400 kg

Specified pressure

bar

-

-

1500 kg

Specified pressure

bar

-

-

BE42.80-P-1002-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 1600 kg to
2400 kg)

1600 kg

Specified pressure

bar

43 (2)

51 (2)

1700 kg

Specified pressure

bar

48 (2)

-

1800 kg

Specified pressure

bar

-

53 (2)

1900 kg

Specified pressure

bar

49 (2)

-

2000 kg

Specified pressure

bar

51 (2)

-

2100 kg

Specified pressure

bar

-

-

2200 kg

Specified pressure

bar

-

-

2300 kg

Specified pressure

bar

-

-

2400 kg

Specified pressure

bar

-

-

Number

Designation

Model 463 to 99
Rear axle spring: yellow/orange
Automatic load-dependent brake pressure control spring: yellow/blue

BE42.80-P-1001-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 900 kg to
1500 kg)

900 kg

Specified pressure

bar

-

1000 kg

Specified pressure

bar

-

1100 kg

Specified pressure

bar

-

1200 kg

Specified pressure

bar

-

1300 kg

Specified pressure

bar

47 (2)

1400 kg

Specified pressure

bar

-

1500 kg

Specified pressure

bar

-

BE42.80-P-1002-01D

Output pressure of ALB controller
(input pressure
ALB controller 100 bar)
with rear axle load
(from 1600 kg to
2400 kg)

1600 kg

Specified pressure

bar

56 (2)

1700 kg

Specified pressure

bar

-

1800 kg

Specified pressure

bar

60 (2)

1900 kg

Specified pressure

bar

62 (2)

2000 kg

Specified pressure

bar

64 (2)

2100 kg

Specified pressure

bar

-

2200 kg

Specified pressure

bar

-

2300 kg

Specified pressure

bar

-

2400 kg

Specified pressure

bar

-

Number

Designation

Model 461, 463

BA42.10-P-1001-02B

Bleed screw at front axle fixed brake caliper

Nm

14

Number

Designation

Model 463

BA42.10-P-1001-08A

Bleed screw to rear axle wheel brake cylinder

Nm

14