Remove/Install Rear-Axle Brake Caliper - AR42.10-P-0080W

Model 166, 172, 292 

Shown on model 172.457 on the right side of the vehicle 

Fig 1: Rear-Axle Brake Caliper 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 injury  . Moving parts can pinch, crush or, in extreme cases even sever extremities.	No parts of the body or limbs should be within the operating area of mechanical components when moving components.	AS00.00-Z-0009-01A
	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 externally invisible brake fluid loss
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Remove/install
1	Move brake pads (10) on rear axle into assembly position.		AR42.10-P-1700-02W
		Do not depress the service brake during Move to assembly position.  Otherwise, damage will occur to the spindle or the brake caliper (3). Close hood. Exit assembly position of the rear-axle brake linings (10).
2	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
3	Remove cover above left suspension strut tower.	Model 166, 292
	Clean
4	Clean area around cap of brake fluid reservoir	Assembly cleaner	*BR00.45-Z-1028-04A
5	Unscrew cap of brake fluid reservoir and suction off some brake fluid.	In order to prevent the brake fluid reservoir from overflowing when pressing back the brake pistons. Properly dispose of extracted brake fluid.
6	Remove rear wheel and tire assemblies.
		Model 166	AP40.10-P-4050EW
		Model 172	AP40.10-P-4050V
		Model 292	AR40.10-P-1100GQC
7	Release and disconnect right rear brake wear sensor (S10/4) from electrical connector of right rear brake wear sensor (S10/4x1).	When removing brake caliper (3) on right side of vehicle.
8	Unscrew screw (4).	When removing brake caliper (3) on right side of vehicle.
		Model 166, 292 Screw/bolt, feed line for brake pad contact sensor to brake caliper	*BA42.10-P-1007-12L
		Model 172Screw/bolt, brake wear sensor to brake caliper	*BA42.10-P-1003-12J
9	Remove electrical connector of right rear brake wear sensor (S10/4x1).	When removing brake caliper (3) on right side of vehicle.
10	Unclip electric line (7) from retaining frame (8).	Model 172 When replacing brake caliper (3) on right side of vehicle.
11	Release and disconnect electrical connector (14) from left electric parking brake actuator motor (M76/1) or right electric parking brake actuator motor (M76/2).
12	Remove screws (1) from 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
13	Remove brake hose (6) from brake caliper (3).	When replacing brake caliper (3).
		Model 166, 292	AR42.10-P-0013GZ
		Model 172	AR42.10-P-0013V
14	Seal exposed connections using suitable plugs.	When replacing brake caliper (3).
		The brake caliper (3) must not run empty. Otherwise, the brake caliper (3) must be replaced.
		Record plug	Fig 2
15	Remove brake caliper (3) from brake caliper support (2).
16	Attach brake caliper (3) to the vehicle free of tension to relieve the brake hose (6) and the electrical line (7).	When reusing the brake caliper (3). Do not stretch or kink the brake hose (6). Otherwise, the brake hose (6) and the electrical line (7) can be damaged.
17	Press back brake piston using pusher tool (01).	When reusing the brake caliper (3).
		Resetting device If the brake piston is sluggish, ↓ Replace brake caliper (3).	Fig 3
18	Remove left electric parking brake actuator motor (M76/1) or right electric parking brake actuator motor (M76/2) from brake caliper (3).	When replacing brake caliper (3).
			AR42.20-P-0600W
19	Remove brake pads (10) from brake caliper support (2).	When removing the brake caliper support (2). Install only brake pads (10) approved by Mercedes-Benz as a set. Do not apply brake paste or lubricants to the brake linings (10) and brake calipers (3).
20	Pull right rear brake wear sensor (S10/4) out of Brake pad (10).	When replacing the brake pads (10).
21	Remove spring steel sheets (11) from brake caliper support (2).	When replacing the brake caliper support (2).
22	Remove screws (15).	When removing the brake caliper support (2).
	Notes on threaded connections fastened using a tightening angle-based tightening process	Model 166, 292	AH00.00-P-0020-01A
		Model 166, 292Bolt, brake caliper support to wheel carrier	*BA42.10-P-1005-12L
		Model 172Bolt, brake caliper/brake caliper support to wheel carrier	*BA42.10-P-1001-12J
	Measure
23	Check brake pads (10) for wear and condition.
		Model 172	AP42.10-P-4252SLB
		Model 166	AP42.10-P-4252GB
		Model 292	AP42.10-P-4252B
		If a problem is detected, ↓ Replace set of brake linings (10).
			AR42.10-P-1700W
24	Check brake disk (9) for wear and condition.
		Model 166	AP42.10-P-4258GQ
		Model 172	AP42.10-P-4258V
		Model 292 If a problem is detected, ↓ Replace sets of brake disks (9).	AR42.10-P-0120A
		Model 166, 292	AR42.10-P-0220GZ
		Model 172 (except 172.466/475)	AR42.10-P-0220W
		Model 172.466/475	AR42.10-P-0220MMI
	Check
25	Check brake caliper (3) and dust boot (13) on brake piston for damage.	If a problem is detected, ↓ Replace corresponding component.
26	Check boots (12) for damage and check that they are seated correctly.	If a problem is detected, ↓ Replace boots (12).
27	Check guide pins (5) for ease of movement.	If a problem is detected, ↓ repair guide pins (5) and guide; replace if necessary.
	Clean
28	Clean contact surfaces of brake pads (10) on brake caliper (3) and on brake caliper support (2).	While doing so do not damage the dust boot (13) on the brake piston or the boots (12). Do not use sharp-edged or pointed objects. Otherwise the brake caliper (3) or brake caliper support (2) must be replaced.
29	Install in the reverse order.
	Initial startup
30	Bleed brake system.	When replacing brake caliper (3).	AR42.10-P-0010CW
	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
31	Operate brake pedal several times until the brake pads (10) make contact with the brake disks (9).	Wen operating the brake pedal, a firm resistance must be felt.
	Check
32	Check fluid level in expansion reservoir for brake fluid; correct if necessary.
		Model 166, 292	AP42.10-P-4210GZ
		Model 172	AP42.10-P-4210V
33	Perform brake test on test stand.
			AP42.00-P-4290BA

Fig 2: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Resetting Device (000 589 52 43 00)

Courtesy of MERCEDES-BENZ USA