Removing, checking and installing rear axle brake pads - AR42.10-P-1700NKB

MODEL 117, 156, 176, 242, 246 

Shown on MODEL 246 

Fig 1: Identifying Rear Axle Brake Pads Remove/Install Components - Shown On Model 246

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Rear Axle Brake Pads Remove/Install Components

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
	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
	Remove/install
1	Position brake pads (10) on rear axle in 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. Leave assembly position for brake pads (10) on rear axle.
2	Switch off ignition and remove transmitter key from electronic ignition lock control unit	In order to prevent unintended movement away from the assembly position.
3	Clean area around cap on expansion reservoir for brake fluid
4	Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid
			AP42.10-P-4210AK
		In order to prevent the expansion reservoir overflowing when pressing back the brake pistons.
5	Remove rear wheels
			AP40.10-P-4050AK
6	Unclip electrical line (7) of rpm sensor from retaining frame (8)
7	Remove bolts (1) from guide pin (5)	Counterhold guide pin (5).
		Guide pin to brake caliper support	*BA42.10-P-1004-12J
8	Detach brake caliper (3) and secure to prevent it from falling down	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. Do not disconnect the electrical connection at the electric parking brake actuator motor. Do not detach brake hose (6).
9	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 pastes or lubricants to the brake pads (10) and brake calipers (3)! MODEL 117.352, 156.952, 176.052 The brake pad (10) with mounting for the brake wear sensor, must be mounted on the brake piston side.
10	Remove spring plates (11) from brake caliper support (2)
	Measure
11	Check brake pad (10) for condition and wear
			AP42.10-P-4253A
		If necessary, replace brake pads (10).
12	Check condition of brake disk (9) and gauge degree of wear	If necessary: ↓ Replace brake disk (9)
			AR42.10-P-0220NKB
13	Check brake caliper (3) and dust boot (13) on brake piston for damage	If damage is present: ↓ Replace brake caliper (3) on rear axle
			AR42.10-P-0080NKB
14	Check boots (4) for damage and correct seating and check guide pin (5) for ease of movement	If damage is present: ↓ Replace brake caliper (3) on rear axle
			AR42.10-P-0080NKB
15	Press back brake piston using pusher tool (01)	Resetting device If the brake piston is difficult to move: ↓ Replace brake caliper (3) on rear axle	Figure
			AR42.10-P-0080NKB
	Clean
16	Use rag to clean contact surfaces on brake pad (10) on the brake caliper (3) and on the brake caliper support (2)	Do not damage the 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
17	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
18	Depress brake pedal several times until brake pads (10) rest against brake disks (9)	Firm resistance should be noticeable at the brake pedal.
19	Check fluid level in brake fluid reservoir, and correct if necessary
			AP42.10-P-4210AK
20	Carry out brake test on the test stand
			AP42.00-P-4290BA

REAR AXLE BRAKE CALIPER

Number	Designation		MODEL 117	MODEL 156
BA42.10-P-1004-12J	Guide pin to brake caliper support	Nm	35	35

REAR AXLE BRAKE CALIPER

Number	Designation		MODEL 176, 246	MODEL 242
BA42.10-P-1004-12J	Guide pin to brake caliper support	Nm	35	35

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

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order note
BR00.45-Z-1028-04A	Assembly cleaner	Adolf Wurth GmbH & Co. KG