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

Model 118.351/353/354/651/653/654, 177.051/053/054/151/951, 247.651/751/753/754

Fig 1: Front Axle Brake Linings/Pads Components Location - Model 247.651/751/753/754 (Right Side Shown)

Courtesy of MERCEDES-BENZ USA

Shown on right side of vehicle

	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
	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	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Topical note	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Topical note	Notes on repairs to brake system		AH42.00-P-0003-01A
Topical note	Brake fluid notes		AH42.50-P-0001-01A
	Notes on installing brake wear indicator contact sensors		AH42.10-P-0003-01CW
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove
1	Remove cover above brake fluid expansion reservoir.
2	Clean area around cap on brake fluid expansion reservoir.	Assembly cleaner	*BR00.45-Z-1028-04A
3	Unscrew cap on brake fluid expansion reservoir and suction off some brake fluid.	This prevents the expansion reservoir overflowing when the brake piston is pushed back.
4	Remove front wheels.		AR40.10-P-1102MFA
5	Release and disconnect electrical connector (7) of right front brakepad wear sensor (S10/2).	When removal of brakepads (2) at front right.
6	Remove electrical wiring harness of right front brakepad wear sensor (S10/2) from brake caliper (8).	When removal of brakepads (2) at front right.
7	Remove brake hose (5) from holder (4).
8	Unscrew upper screw (1), replace with guide pin (6), and tighten guide pin (6) slightly.	Guide bolts	Fig 2
9	Unscrew lower screw (1), replace with guide pin (6) and tighten guide pin (6) slightly.	Guide bolts	Fig 2
10	Push brake caliper (8) with attached brake hose (5) to the side onto guide pin (6).	Do not crush or kink the brake hose (5) or subject it to tensile loads. This will result in damage to the brake hose (5) and can impair its function.
11	Remove brakepads (2) from brake caliper (8).
12	Unclip retaining spring (3) from brake caliper (8) and remove.	When replacing retaining spring (3) or brake caliper (8).
13	Pull right front brakepad wear sensor (S10/2) out of backing plate of brakepad (2).	When replacing brakepads (2) or when replacing front right brakepad wear sensor (S10/2). Pay attention to the installation location of the right front brakepad wear sensor (S10/2).
	Check
14	Check that retaining spring (3) is not damaged and is in good condition.	If there is a problem, ↓ replace retaining spring (3).
15	Check brakepads (2) for wear and condition.
		Model 118.351/353/354/651/653/654	AP42.10-P-4252CLA
		Model 177.051/053/054/151/951	AP42.10-P-4252MFA
		Model 247.651/751/753/754 If there is a problem, ↓ replace brakepads (2).	AP42.10-P-4252MFB
16	Check brake disk for wear and condition.	Model 118.351/353/354/651/653/654	AR42.10-P-0120MFC
		Model 177.051/053/054/151/951	AR42.10-P-0120MFA
		Model 247.651/751/753/754 If there is a problem, ↓ Replace brake disks.	AR42.10-P-0120MFB
			AR42.10-P-0220MFA
17	Check brake caliper (8) for damage.	If there is a problem, ↓ Replace brake caliper (8).	AR42.10-P-0070MFB
18	Press back brake pistons with pusher tool.	Secure remaining brake pistons using two
		wedges against slipping out.
		Resetting device	Fig 3
		Wedge	Fig 4
		If the brake pistons can only be moved sluggishly, ↓ replace brake caliper (8).
			AR42.10-P-0070MFB
	Install
19	Clean contact surfaces of brakepads (2) on brake caliper (8) and on brake pistons.	Do not use sharp-edged or pointed objects. Otherwise the brake caliper (8) or the dust boots of the brake pistons can be damaged.
		Assembly cleaner	*BR00.45-Z-1028-04A
20	Insert right front brakepad wear sensor (S10/2) at backing plate of brakepad (2).	When replacing front right brakepads (2) or when replacing front right brakepad wear sensor (S10/2).
21	Install retaining spring (3) in brake caliper (8).	When replacing retaining spring (3) or brake caliper (8).
22	Insert brakepads (2).	Only sets of brakepads (2) approved by Mercedes-Benz may be installed.
23	Push brake caliper (8) onto axle carrier.
24	Unscrew lower guide pin (6), replace with screw (1) and tighten screw (1) slightly.
25	Unscrew upper guide pin (6), replace with screw (1) and tighten screw (1) slightly.
26	Tighten screws (1).	Bolt, brake caliper/brake caliper support to steering knuckle	*BA42.10-P-1001-10ZA
27	Attach electrical wiring harness of front right brakepad wear sensor (S10/2) to brake caliper (8).	When installing right front brakepads (2).
28	Connect electrical connector (7) of right front brakepad wear sensor (S10/2).	When installing right front brakepads (2).
29	Install brake hose (5) in holder (4).
30	Install front wheels.		AR40.10-P-1102MFA
31	Operate brake pedal several times until the brakepads (2) make contact with the brake disks.	Firm resistance should be noticeable at the brake pedal.
	Check
32	Check and correct brake fluid level in expansion reservoir.
			AP42.10-P-4210D
33	Perform brake test on test stand.
			AP42.00-P-4290BA