Remove/Check/Install Front Axle Brake Pads - AR42.10-P-1610GQA

MODEL 166.074/874, 292.374/375

	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
	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
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Notes on installing brake wear indicator contact sensors		AH42.10-P-0003-01CW
	Remove/install
1	Remove cover over left suspension strut tower
2	Clean area around cap on expansion reservoir for brake fluid
3	Undo cap of expansion reservoir for brake fluid
4	Extract some brake fluid	In order to prevent the expansion reservoir overflowing when pressing back the brake pistons.
5	Remove front wheel-and-tire assemblies	Model 166.074/874	AP40.10-P-4050EW
		Model 292.374/375	AR40.10-P-1100GQC
6	Detach electrical connection for front right brake wear sensor (S10/2x1) from front right brake wear sensor (S10/2)
7	Remove bolt (30)	Bolt for anti-rattle spring support	*BA42.10-P-1005-10L
8	Remove support (33)
9	Use suitable tool to drive out retaining pins (41) and remove retaining spring (31d)	Replace retaining pins (41) if necessary.
10.1	Pull brake linings (43) out of brake caliper (31a)	If the brake linings (43) are not seized. Do not apply any brake paste or lubricants to brake linings (43) and brake calipers (31a). Malfunctions may occur otherwise. Only sets of brake linings (43) approved by Mercedes-Benz may be installed. Make sure that the brake linings (43) are installed at the correct position.
10.2	Push brake linings (43) out of brake caliper (31a)	If the brake linings (43) are seized. Do not apply any brake paste or lubricants to brake linings (43) and brake calipers (31a). Malfunctions may occur otherwise. Only sets of brake linings (43) approved by Mercedes-Benz may be installed. Make sure that the brake linings (43) are installed at the correct position. Lever	Fig 3
	Check
11	Check brake linings (43) for wear and condition	Model 166.074/874	AP42.10-P-4253A
		Model 292.374/375	AP42.10-P-4252B
		If complaint present ↓ Replace brake linings (43)
12	Check brake disks (61) for wear and that they are in good condition	Model 166.074/874	AP42.10-P-4258GQ
		Model 292.374/375	AR42.10-P-0120A
		If complaint present ↓ Replace brake discs (61)
13	Check brake caliper (31a) and dust boots of brake piston for leaktightness and damage	If complaint present ↓ Replace brake caliper (31a)	AR42.10-P-0070GZ
14	Secure brake piston against slipping out	Wedge	Fig 1
15	Press back brake piston using resetting device	The remaining brake pistons must be secured against slipping out. Resetting device	Figure
		With sluggish brake pistons ↓ Replace brake caliper (31a)	AR42.10-P-0070GZ
16	Clean contact surfaces of brake linings (43) on brake caliper (31a)	Do not damage the brake piston dust boots. Do not use sharp-edged or pointed objects. The brake caliper (31a) must otherwise be replaced.
17	Pull right front brake wear sensor (S10/2) out of pad backing plate of brake lining (43)	Only when replacing the brake linings (43) or if the front right brake wear sensor (S10/2) is defective.
18	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
19	Depress brake pedal several times until brake linings (43) lie against brake disks (31a)
	Check
20	Check fluid level in brake fluid reservoir, and correct if necessary
			AP42.10-P-4210GZ
21	Carry out brake test on the test stand
			AP42.00-P-4290BA