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

MODEL 129, 140, 170, 202, 208, 210

Fig 1: Identifying Rear Axle Brake Pads Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fixed brake caliper with two retaining pins (41) on rear axle

Fig 2: Identifying Rear Axle Brake Pads Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fixed brake caliper with one retaining pin (41) on rear axle

	Remove/install
	Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes	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
	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
1	Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid	In order to prevent the expansion reservoir overflowing when the brake pistons (47) are pushed back.
2	Remove rear wheels.
	Remove/install wheels, rotate if necessary		AP40.10-P-4050Z
3	Remove brake pad contact sensor	Installation: Replace defective brake pad contact sensor.
	Notes on installing brake pad wear sensor contact sensors		AH42.10-P-0003-01A
4	Using punch (035) hammer out retaining pins (41) and remove retaining springs	Installation: Hammer in retaining pins (41) as far as the stop.
5	Pull brake pads (43) out of brake caliper (31)	In order to avoid damage, insert a wedge between the lever (034) and brake caliper (31) when pressing out seized brake pads (43) . Brake pads (43) are to be disposed of as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste. Installation: Only sets of brake pads (43) approved by Mercedes-Benz may be installed. Install brake pads (43) with peripheral damping (a and c) ungreased. On brake pads (43) without peripheral damping on the side surfaces (arrows) coat with some brake pad paste.
			Figure
		Brake pad paste	*BR00.45-Z-1003-06A
	Checking
6	Check brake pad thickness and brake disks	Replace brake pads (43) and brake disks in sets if necessary.
	Inspect condition of brake disks		AP42.10-P-4258AM
	Check brake lining thickness	If the brake pads (43) have worn down to beyond the wear limit, the web between the sealing groove and dust cap may be damaged; therefore: ↓	AP42.10-P-4253A
		Check brake system for leaks with pressure tester.	AR42.10-P-0015A
7	Press back brake piston (47) using resetting device (031)	Do not bend heat shield. If brake pads (43) have been removed from several brake calipers (31), their brake pistons (47) must be secured beforehand with wedges to prevent them from falling out . Do not fit the pusher tool (031) to the brake disk, but push back the opposite brake pistons (47) simultaneously. If brake pistons (47) are sluggish: ↓
		Repair brake caliper (31).	AR42.10-P-0151A
			Figure
			Figure
	Clean
8	Clean contact surfaces of brake pads (43) using	brake caliper brush (030) Do not damage boots of brake pistons (47).
			Figure
9	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 engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.	AS42.50-Z-0002-01A
10	Operate the brake pedal several times until the brake pads (43) contact the brake disks	A firm resistance must be noticeable at the brake pedal.
	Checking
11	Check brake fluid level, correct if necessary
	Brake system - inspect fluid level		AP42.10-P-4210Z