Remove/Install Brake Shoes At Rear Axle - AR42.10-P-0165SR
MODEL 453
MODIFICATION NOTES
| 12.01.2016 | Document revised completely. |
| 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 | |
| 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 | Remove brake drum | AR42.10-P-1010SR | |
| 2 | Remove clamping springs (2) and remove retaining pins (3) | ||
| 3 | Pull brake shoes (1) one after the other out of the support bushing (12), tilt slightly upwards and position on support bushing (12) | The spring (5) may not be stretched. Otherwise, the brake may suffer damage or malfunction. |
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| 4 | Detach spring (5) and remove | ||
| 5 | Unhook brake cable (4) from parking brake lever (9) | ||
| 6 | Tilt brake shoes (1) upwards over the wheel hub, push piston of wheel brake cylinder (7) together and remove brake shoes (1) with spring (10) and slack adjuster (13) | Carefully guide brake shoes (1) over dust boots of wheel brake cylinder (7). If a dust boot is damaged, the wheel brake cylinder (7) must be replaced. |
|
| 7 | Detach spring (10) and slack adjuster (13) from brake shoe (1) | ||
| Clean | |||
| 8 | Clean brake cover plate (6) | ||
| Check | |||
| 9 | Check wear and condition of brake shoes (1) | The parking brake lever (9) must operate smoothly. Otherwise, the parking brake will be difficult to operate or it may not release. The brake lining of the brake shoes (1) must be absolutely free of grease. Otherwise the braking effect will be impaired. Brake lining thickness In the event of complaints ↓ Replace brake shoes (1) on each axle. |
*BE42.10-P-1002-12E |
| 10 | Check ease of movement of pistons and leak tightness of wheel brake cylinder (7) | In the event of complaints ↓ Replace wheel brake cylinder (7). In the event of even the slightest signs of brake fluid leaks or sluggishness of the pistons of the wheel brake cylinder (7) this must be replaced. Otherwise, the braking effect may be impaired. |
AR42.10-P-0167SR |
| 11 | Check slack adjuster (13) for damage | In the event of complaints ↓ Replace slack adjuster (13). |
|
| 12 | Check bimetal locking clip (13.2) | When under load, the bimetal locking clip (13.2) must be capable of being pushed into the hook (arrow C). If the slack adjuster (13) is relieved, while the bimetal locking clip (13.2) is in the hook, the bimetal locking clip (13.2) must hold the slack adjuster (13) in place. In the event of complaints ↓ Replace slack adjuster (13). |
|
| 13 | Check adjuster mechanism of slack adjuster (13) by pushing together and then releasing again | In the event of complaints ↓ Replace slack adjuster (13). |
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| Install | |||
| 14 | Set slack adjuster (13) back slightly, by screwing-in the brake shoe mounting (13.1) | Do not screw brake shoe mounting (13.1) all the way in or tighten it. Otherwise, reliable adjustment is no longer assured. |
|
| 15 | Coat contact surfaces (11) and contact surfaces on slack adjuster (13) with thin coating of brake paste | MB Never Seeze brake paste (gray) | *BR00.45-Z-1083-06A |
| 16 | Mount spring (10) and slack adjuster (13) to brake shoes (1) | The longer part (arrow A) of the brake shoe mounting (13.1) must be located on the outside of the brake shoe (1) with the parking brake lever (9). |
|
| 17 | Push piston of wheel brake cylinder (7) together, mount brake shoes (1) with spring (10) and slack adjuster (13) onto piston of wheel brake cylinder (7), tilt downwards over wheel hub, and position on support bushing (12) | Carefully guide brake shoes (1) over dust boots of wheel brake cylinder (7). If a dust boot is damaged, the wheel brake cylinder (7) must be replaced. |
|
| 18 | Hook brake cable (4) into parking brake lever (9) | ||
| 19 | Attach spring (5) | ||
| 20 | Position brake shoes (1) one after the other into the support bushing (12) | The spring (5) may not be stretched. Otherwise, the brake may suffer damage or malfunction. |
|
| 21 | Insert retaining pins (3) and install clamping springs (2) | ||
| 22 | Install brake drum | AR42.10-P-1010SR |
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 | ||
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1083-06A | MB Never Seeze brake paste (gray) | A 001 989 94 51 12 |