Remove/install rear-axle brake caliper

AR42.10-P-0080FR

06.03.2020

Model

257

P42.10-3214-09

Shown with code 489 (AIR BODY CONTROL)

1	Brake caliper	7	Brake hose
2	Electrical connector	8	Electrical connector
3	Screw	13	Electric line
4	Screw	14	Electric line
5	Brake wear sensor coupling housing	M76/1	Left electric parking brake actuator motor
6	Screw	M76/2	Right electric parking brake actuator motor

Shown except code 489 (AIR BODY CONTROL)

9	Brake linings
10	Brake disk
11	Caliper support
12	Guide pin

P42.10-3150-12

 Warning	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
 Caution	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
 Danger	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
Topical note	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
Topical note	Notes on repairs to brake system		AH42.00-P-0003-01A
Topical note	Notes on handling, transport and storage of composite brake disks		AH42.10-P-9406-12LF
Topical note	Brake fluid notes		AH42.50-P-0001-01A
 	Remove/install
1	Remove cover over the brake fluid expansion reservoir
2	Clean area surrounding the cap of the brake fluid expansion reservoir	Assembly cleaner	*BR00.45-Z-1028-04A
3	Unscrew cap from brake fluid expansion reservoir and extract some brake fluid	 This prevents the brake fluid expansion reservoir from overflowing when the brake pistons are pushed back.
4	Move rear axle brake lining (9) into assembly position		AR42.10-P-1710-01FR
		 Do not operate the service brake while "Move to assembly position" is shown. Otherwise the spindle in the brake caliper (1) will be damaged.
		 The hood must be closed.
5	Switch off ignition and store transmitter key outside of transmission range (at least 2 m)
6	Remove rear wheel		AR40.10-P-1102A
7	Unhook electric line (13) from holders
8	Unhook electric line (14) from holders	Model 257 with code 489 (AIR BODY CONTROL)
9	Detach electrical plug (2) from coupling housing for brakepad wear sensor (5)	When removing brake caliper (1) on right.
10	Remove bolt (4) and hang coupling housing for brakepad wear sensor (5) to one side	When removing brake caliper (1) on right.
11	Release and detach electrical plug (8)
12	Remove brake hose (7)		AR42.10-P-0023FR
13	Remove bolts (3)	 Guide pin to brake caliper support or bolt for guide pin to brake caliper	*BA42.10-P-1003-12W
14	Remove brake caliper (1) from brake caliper support (11)	 Installation: The new brake caliper (1) is shipped in prefilled condition and it may not be drained. Otherwise the brake caliper (1) cannot be vented.
15	Remove electric parking brake actuator motor (M76/1, M76/2) from brake caliper (1)	When replacing the brake caliper (1).
			AR42.20-P-0600FR
	Check
16	Check brake caliper (1) and dust boot on brake piston for leak tightness and damage	If a problem arises
		
		Replace brake caliper (1).
		 Installation: The new brake caliper (1) is shipped in prefilled condition and it may not be drained. Otherwise the brake caliper (1) cannot be vented.
17	Check brake caliper support (11) for damage	If a problem arises
		
		Replace brake caliper support (11).
			AR42.10-P-0221FR
18	Check guide pin (12) for damage and ease of movement	If a problem arises
		
		Replace brake caliper support (11).
			AR42.10-P-0221FR
19	Remove brakepads (9), check for wear and condition
			AP42.10-P-4252CLS
		If a problem arises
		
		Replace brakepads (9).
20	Check brake disk (10) for wear and condition		AR42.10-P-0120FR
		If a problem arises
		
		Replace brake disks (10).
			AR42.10-P-0220FR
21	Install in the reverse order
22	Bleed brake system		AR42.10-P-0010FR
23	Operate brake pedal several times until brakepads (9) make contact with brake disks (10)	 Firm resistance should be noticeable at the brake pedal.
	Check
24	Check and correct brake fluid level in expansion reservoir for brake fluid
			AP42.10-P-4210B
25	Carry out brake test on the test stand
			AP42.00-P-4290BA

 Rear axle brake caliper

Number	Designation		Model 257
BA42.10-P-1003-12W	Guide pin to brake caliper support or bolt for guide pin to brake caliper	Nm	25

Repair materials

Number	Designation	Order number
BR00.45-Z-1028-04A	Assembly cleaner	A 000 986 56 01

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