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

Model 238 

Fig 1: Rear Axle Brake Caliper Components Location - Model 238 (Shown On Model 238.3)

Courtesy of MERCEDES-BENZ USA

Shown on model 238.3 with code 489 (AIR BODY CONTROL) on right side of vehicle 

Shown on model 238 3 except code 489 (AIR BODY CONTROL) on right side of vehicle 

Courtesy of MERCEDES-BENZ USA

	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
	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
Notice	Notes on handling, transport and storage of composite brake disks		AH42.10-P-9406-12LF
Notice	Brake fluid notes		AH42.50-P-0001-01A
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Notes on repairs to brake system		AH42.00-P-0003-01A
	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	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.	AR42.10-P-1710-01LWE
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 238 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)	Installation: Bleed brake system only after installation of brakepads (9).	AR42.10-P-0023LWO
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)	: 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	Detach electric parking brake actuator motor (15) from brake caliper (1)	When replacing the brake caliper (1).	AR42.20-P-0600LWO
	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). : 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-0221LWO
18	Check guide pin (12) for damage and ease of movement	If a problem arises ↓
		Replace brake caliper support (11).	AR42.10-P-0221LWO
19	Remove brakepads (9), check for wear and condition
		If a problem arises ↓ Replace brakepads (9).	AP42.10-P-4252F
20	Check brake disk (10) for wear and condition		AR42.10-P-0120LWO
		If a problem arises ↓ Replace brake disks (10).	AR42.10-P-0220LWO
21	Install in the reverse order
22	Bleed brake system		AR42.10-P-0010LWE
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