Remove/install brake drum

AR42.10-P-1010SR

Remove/install brake drum

28.01.2016

Model

453

Modification notes

11.01.2016

Document revised completely.

28.01.2016

Presetting for outside diameter of brake shoes

Model 453.0

BE42.10-P-1003-12E

1

Brake drum

2

Bolts

3

Wheel hub

A

Centering surface

4

Brake shoes

5

Adjustment plate

6

Bimetal fuse

7

Adjusting nut

 Danger !

Risk of accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first time after repair work.

Before starting the engine, actuate brake pedal several times until pressure is built up and maintained in the brake system.

AS42.50-Z-0002-01A

 Danger !

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 Danger !

Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid

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



Notes on repairs to brake system

AH42.00-P-0003-01A



Brake fluid notes

AH42.50-P-0001-01A



Remove

1

Release adjusting nut of brake cable on parking brake lever up to end of thread and completely lower the parking brake lever

AR42.20-P-0540SR

 The thread must fit flush with the adjusting nut.

2

Remove left or right rear wheel

AR40.10-P-1100SR

3

Unscrew bolts (2)

4

Remove brake drum (1) from wheel hub (3)


The brake drum (1) must have unobstructed movement.
Otherwise, the brake may be damaged.

If the brake drum (1) cannot be removed.



Rest brake shoe (4) by turning the adjusting nut (7) through a wheel bolt threaded hole


The bimetal fuse (6) may not be used here as a support bushing.
Otherwise, the bimetal fuse (6) may be damaged.



Check

5

Check brake drum (1) for wear and damage

Inside diameter of brake drum

*BE42.10-P-1001-12E

In the event of complaints



Replace brake drums (1) and brake shoes (4) on each axle

AR42.10-P-0165SR

6

Check brake shoes (4) for wear and damage


The brake lining of the brake shoes (4) must be absolutely free of grease.
Otherwise the braking effect will be impaired.

Brake lining thickness

*BE42.10-P-1002-12E

In the event of complaints



Replace brake shoes (4) on each axle

AR42.10-P-0165SR

7

Check leaktightness of wheel brake cylinder

In the event of complaints



Replace wheel brake cylinder

AR42.10-P-0167SR


At the merest hint of a brake fluid leakage, the wheel brake cylinder must be replaced.
Otherwise, the braking effect may be impaired.



Clean

8

Clean brake surface and contact surface of wheel hub (3) on brake drum (1) until they are metallic bright

9

Clean contact surface of brake drum on wheel hub (3) until it is metallic bright



Install

10

Apply light coating of brake paste to centering surface (A)

Brake paste

*BR00.45-Z-1060-06A



Measure

11

Measure outside diameter of brake shoes (4), as shown

12

Raise adjusting plate (5) using a screwdriver and adjust outside diameter of brake shoes (4) by turning adjusting nut (7) using a second screwdriver

Presetting for outside diameter of brake shoes

*BE42.10-P-1003-12E

If adjusting nut (7) is sluggish



Replace brake adjuster

AR42.10-P-0165SR

13

Mount brake drum (1) onto wheel hub (3)

14

Tighten bolts (2)

 Bolt, brake drum to wheel hub

*BA42.10-P-1002-16D

15

Mount left or right rear wheel

AR40.10-P-1100SR

 Only lower vehicle after mounting left or right rear wheel far enough to enable it still to be turned.

16

Slowly operate brake pedal repeatedly until an adjustment clicking is no longer heard


The parking brake lever may not be operated here.
Otherwise, the parking brake lever of the brake shoes (4) may be pulled onto the wheel hub bolts where they can no longer be released.

17

Adjust parking brake

AR42.20-P-0540SR



Check

18

Carry out brake test on the test stand



AP42.00-P-4290MCC

Test and adjustment values for drum brake

Number

Designation

Model 453.3/4

Model 453.0

BE42.10-P-1001-12E

Inside diameter of brake drum

New

mm

203,2

228,5

Wear limit for maintenance service

mm

204,4

229,5

Test and adjustment values for drum brake

Number

Designation

Model 453.3/4

Model 453.0

BE42.10-P-1002-12E

Brake lining thickness

New

mm

4,2

4,2

Wear limit for maintenance service

mm

2,4

2,4

Pad backing plate

mm

2,0

2,0

Test and adjustment values for drum brake

Number

Designation

Model 453.3/4

Model 453.0

BE42.10-P-1003-12E

Presetting for outside diameter of brake shoes

mm

202,7 (-0,5)

227,6 (-0,5)

 Drum brake

Number

Designation

Model 453

BA42.10-P-1002-16D

Bolt, brake drum to wheel hub

Nm

21

Repair materials

Number

Designation

Order number

BR00.45-Z-1060-06A

Brake paste

Q0007414V000000000