Removing, Checking And Installing Rear Axle Brake Pads - AR42.10-P-1700W

Model 166, 172, 292

Shown on model 172.457

Fig 1: Rear Axle Brake Pads/Linings Components Location - Model 166 (Shown On Model 172.457)

Courtesy of MERCEDES-BENZ USA

Shown on model 172.457

Courtesy of MERCEDES-BENZ USA

	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
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-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
	Remove/install
1	Move brake pads (10) of the 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. The engine hood must be closed. The assembly position for the brake lining (10) on the rear axle must be exited.
2	Switch off ignition and keep transmitter key at a location beyond transmitter range (at least 2 m)
3	Remove cover over left suspension strut tower	Model 166, 292
	Clean
4	Clean the area around the cap of the brake fluid reservoir
5	Unscrew cap of brake fluid reservoir and extract some brake fluid	In order to prevent the brake fluid reservoir from overflowing when pressing back the brake pistons. Extracted brake fluid must be disposed of properly.
6	Detach rear complete wheels
		Model 166	AP40.10-P-4050EW
		Model 172	AP40.10-P-4050V
		Model 292	AR40.10-P-1100GQC
7	Detach right rear brake wear sensor (14) from electrical connection (15)	When removing brake linings (10) on right side of vehicle.
8	Unscrew bolt (4)	Model 172 When removing brake linings (10) on right side of vehicle.
		Screw/bolt, brake wear sensor to brake caliper	*BA42.10-P-1003-12J
9	Remove electrical connection (15)	Model 172 When removing brake linings (10) on right side of vehicle.
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, 292
11	Remove bolt (1) on lower guide pin (5)	Model 166, 292Screw/bolt, brake caliper to guide pin	*BA42.10-P-1004-12L
		Model 172Guide pin to brake caliper support or bolt for guide pin to brake caliper	*BA42.10-P-1004-12J
12	Swivel brake caliper (3) upwards and fix in place	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. The brake hose (6) may not be detached.
13	Remove brake pads (10) from brake caliper support (2)	Only complete sets of brake linings (10) approved by Mercedes-Benz may be installed. Do not apply brake paste or lubricants to the brake linings (10) and brake calipers (3). The brake lining (10) with support for the brake wear sensor must be mounted on the brake piston side.
		Dispose of the brake linings (10) as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste.
14	Pull rear right brake wear sensor (14) out of brake lining (10)	When replacing brake linings (10) on right side of vehicle.
15	Remove spring plates (11) from brake caliper support (2)	If there are problems ↓ Replace spring steel sheets (11).
	Measure
16	Check condition of brake linings (10)
		Model 172	AP42.10-P-4252SLB
		Model 166	AP42.10-P-4252GB
		Model 292 If necessary ↓ Replace brake linings (10) in sets.	AP42.10-P-4252B
17	Check condition of brake disk (9)
		Model 166	AP42.10-P-4258GQ
		Model 172	AP42.10-P-4258V
		Model 292	AR42.10-P-0120A
		If necessary ↓ Replace brake disks (9) in sets.
		Model 166, 292	AR42.10-P-0220GZ
		Model 172.466/475	AR42.10-P-0220MMI
		Model 172 (except 172.466/475)	AR42.10-P-0220W
	Check
18	Check brake caliper (3) and dust boot (13) on brake piston for damage	If there are problems ↓ Replace corresponding component.
			AR42.10-P-0080W
19	Check boots (12) for damage and correct seat	If there are problems ↓ Replace boots (12).
20	Check guide pin (5) for ease of movement	If there are problems ↓ Repair guide pin (5) and guide, replace, if necessary.
	Clean
21	Clean contact surfaces of brake linings (10) or brake caliper (3) and on brake caliper support (2)	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) may be damaged.
22	Press back brake piston using pusher tool (01)	Resetting device If brake piston is sluggish ↓ Replace brake caliper (3)	Fig 2
			AR42.10-P-0080W
23	Install in the reverse order
	Initial startup
	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
24	Depress brake pedal several times until brake pads (10) rest against brake disks (9)	Wen operating the brake pedal, a firm resistance must be felt.
	Check
25	Check fluid level in the brake fluid reservoir, correct if necessary
		Model 166, 292	AP42.10-P-4210GZ
		Model 172	AP42.10-P-4210V
26	Carry out brake test on the test stand
			AP42.00-P-4290BA