Removing, checking and installing rear axle brake pads - AR42.10-P-1700W
MODEL 166, 172
| Remove/install | |||
| 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 | |
| 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 self-locking nuts and bolts | AH00.00-N-0001-01A | ||
| Brake fluid notes | AH42.50-P-0001-01A | ||
| Notes on repairs to brake system | AH42.00-P-0003-01A | ||
| Notes on installing brake wear indicator contact sensors | AH42.10-P-0003-01CW | ||
| 1 | Move brake lining (10) of rear axle into assembly position | AR42.10-P-1700-02W | |
Do not depress the service brake during "Move to assembly position". Otherwise, the spindle in the brake caliper (3) can be damaged. |
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| 2 | Switch off ignition and remove transmitter key or KEYLESS-GO start/stop button from electronic ignition lock control unit | ||
| 3 | Open engine hood and raise to vertical position | MODEL 166, 172 | |
| MODEL 166 | AR88.40-P-1000GQ | ||
| MODEL 172.4 | AR88.40-P-1000V | ||
| 4 | Remove cover over left suspension strut tower | MODEL 166 | |
| Clean | |||
| 5 | Clean the area around the cap of the brake fluid reservoir | Assembly cleaner | *BR00.45-Z-1028-04A |
| 6 | Unscrew cap of brake fluid reservoir and extract some brake fluid | ||
| 7 | Detach rear complete wheels | ||
| MODEL 166 | AP40.10-P-4050EW | ||
| MODEL 172 | AP40.10-P-4050V | ||
| 8 | Disconnect right rear brake lining wear sensor (S10/4) from electrical connection of right rear brake lining wear sensor (S10/4x1) | ||
| 9 | Remove screw/bolt (4) and remove electrical connection of the right rear brake lining wear sensor (S10/4x1) | MODEL 172 |
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MODEL 172 |
*BA42.10-P-1003-12J | ||
| 10.1 | Unclip electrical line (7) from retaining frame (8) | MODEL 172 | |
| 10.2 | Release and disconnect electrical connector on electric parking brake actuator motor | MODEL 166 | |
| 11 | Remove bolt (1) on lower guide pin (5) | ||
MODEL 166 |
*BA42.10-P-1004-12L | ||
MODEL 172 |
*BA42.10-P-1004-12J | ||
| 12 | Swivel brake caliper (3) upwards | Do not tension or kink brake hose (6). Attach brake caliper (3) to the vehicle free of tension to relieve the brake hose (6) and the electrical line (7). Otherwise the brake hose (6) and the electrical line (7) can be damaged. |
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| 13 | Remove brake linings (10) from brake caliper support (2) | ||
| 14 | Pull right rear brake lining wear sensor (S10/4) out of brake lining (10) | When replacing the brake linings (10) on the right-hand-side of vehicle. |
|
| 15 | Remove spring plates (11) from brake caliper support (2) | ||
| Measure | |||
| 16 | Check condition of brake linings (10) and measure degree of wear | ||
| AP42.10-P-4253A | |||
| 17 | Check condition of brake disk (9) and gauge degree of wear | ||
| MODEL 172 | AP42.10-P-4258V | ||
| MODEL 166 Replace brake disk (9) if necessary: ↓ Remove/install brake disc |
AP42.10-P-4258GQ | ||
| MODEL 172.475 | AR42.10-P-0220MMI | ||
| MODEL 172 (except 172.475) | AR42.10-P-0220W | ||
| MODEL 166 | AR42.10-P-0220GZ | ||
| 18 | Check brake caliper (3) and dust boot (13) on brake piston for damage | Replace brake caliper (3) if damaged: ↓ Remove/install rear-axle brake caliper |
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| AR42.10-P-0080W | |||
| 19 | Check boots (12) for damage and correct seating and check guide pin (5) for ease of movement | Replace brake caliper support (2) if damaged, see: ↓ Remove/install rear-axle brake caliper |
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| AR42.10-P-0080W | |||
| 20 | Press back brake piston using pusher tool (01) | If brake piston is sluggish, replace brake caliper (3): ↓ Remove/install rear-axle brake caliper |
Figure |
| AR42.10-P-0080W | |||
| Clean | |||
| 21 | Clean contact surfaces of the brake linings (10) on brake caliper (3) and brake caliper support (2) using a rag | Do not damage dust boot (13) on the brake piston. Do not use sharp-edged or pointed objects. Otherwise the brake caliper (3) or the brake caliper support (2) can be damaged. |
|
| Assembly cleaner | *BR00.45-Z-1028-04A | ||
| 22 | Install in the reverse order | ||
| 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 | ||
| 23 | Depress brake pedal several times until brake linings (10) rest against brake disks (9) | ||
| 24 | Check fluid level in the brake fluid reservoir, correct if necessary | ||
| MODEL 166 | AP42.10-P-4210GZ | ||
| MODEL 172 | AP42.10-P-4210V | ||
| 25 | Carry out brake test on the test stand | ||
| AP42.00-P-4290BA |
REAR AXLE BRAKE CALIPER
| Number | Designation | MODEL 172 | |
|---|---|---|---|
| BA42.10-P-1003-12J | Screw/bolt, brake wear sensor to brake caliper | Nm | 8 |
REAR AXLE BRAKE CALIPER
| Number | Designation | MODEL 172 | |
|---|---|---|---|
| BA42.10-P-1004-12J | Guide pin to brake caliper support | Nm | 28 |
REAR AXLE BRAKE CALIPER
| Number | Designation | MODEL 166 | |
|---|---|---|---|
| BA42.10-P-1004-12L | Bolt, brake caliper to guide pin | Nm | 35 |
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | Adolf Wurth GmbH & Co. KG |