Remove/install front axle brake caliper - AR42.10-P-0070V

MODEL 171.442 with ENGINE 271.944

MODEL 171.454 with ENGINE 272.942

Fig 1: Identifying Front Axle Brake Caliper Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	-
	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.	-
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
1	Remove front wheel
	Detach/attach wheel and rotate if necessary		AP40.10-P-4050V
2	Unscrew brake line (6) from brake hose (51) and seal off openings	Seal off line connections using plugs. The brake fluid expansion reservoir must not be allowed to run completely empty.
		Brake line to brake hose	*BA42.10-P-1001-04A
		Brake hose to fixed or floating caliper	*BA42.10-P-1002-04A
		Set of stop plugs	Figure
		Box wrench bit	Figure
		Box wrench	Figure
3	Unclip brake hose (51) on bracket on shock absorber
4	Unscrew brake hose (51) on floating brake caliper (31) and seal with stop plug		*BA42.10-P-1002-04A
		Set of stop plugs	Figure
		Box wrench	Figure
		Box wrench bit	Figure
5.1	Disconnect connector (10) from right front brake pad contact sensor (S10/2)	When removing the right front brake linings
	Notes on installing brake pad wear sensor contact sensors		AH42.10-P-0003-01A
6.1	Unscrew bolt (4) of right front brake pad contact sensor (S10/2) from brake caliper (31)	When removing the right front brake linings Installation: Install new self-locking bolt (4)
			*BA42.10-P-1004-10P
7	Unscrew bolts (5) of brake caliper (31) from brake caliper support (30)	Installation: Replace self-locking bolts (5).
			*BA42.10-P-1003-10P
8	Remove brake linings
9	Install in the reverse order
10	Bleed brake system		AR42.10-P-0010V
	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
11	Press the brake pedal several times until the brake pads contact the brake disks	The brake pads contact the brake disks when a firm resistance is noticeable at the brake pedal.
	Checking
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
12	Check brake system for leaks		AR42.10-P-0100-01V