Remove/check/install front axle brake pads - AR42.10-P-1600MMI

MODEL 172.466/475 With fixed brake caliper 

Shown on model 172.475 with fixed brake caliper 

Fig 1: Identifying Front Axle Brake Pads Remove/Install Components - Shown On Model 172.475

Courtesy of MERCEDES-BENZ USA

	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
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on installing brake wear indicator contact sensors		AH42.10-P-0003-01CW
	Clean
1	Clean area around cap on expansion reservoir for brake fluid
	Remove
2	Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid	In order to prevent the expansion reservoir overflowing when pressing back the brake pistons.
3	Remove front wheel-and-tire assemblies
			AP40.10-P-4050V
4	Disconnect right front brake wear sensor (S10/2) from right front brake wear sensor electrical connector (S10/2x1)
5	Drive out retaining pins (1) with punch and remove retaining spring (2)	Drive in retaining pins (1) up to the end stop. Check retaining spring (2) is correctly seated. Replace retaining pins (1) if necessary.
6	Pull brake linings (3) out of brake caliper (4)	Press out seized brake linings (3) using a lever. Only complete sets of brake linings (3) approved by Mercedes-Benz may be installed. Do not  apply brake paste or lubricants to the brake linings (3) and brake caliper (4). Dispose of the brake linings (3) as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste.
		Lever	Fig 4
7	Pull right front brake wear sensor (S10/2) out of pad backing plate of brake linings (3)	Replace the defective right front brake wear sensor (S10/2).
	Measure
8	Check condition of brake linings (3) and measure degree of wear
			AP42.10-P-4253A
		If necessary ↓ Replace brake linings (3)
9	Check condition of brake disk and gauge degree of wear
			AP42.10-P-4258V
		If necessary ↓ Replace brake disks
			AR42.10-P-0220MMI
10	Check brake caliper (4) and dust boots of brake pistons for leaktightness and damage, and replace if necessary		AR42.10-P-0070MMI
	Install
11	Press back brake piston using resetting device	Secure remaining brake pistons to prevent them slipping out.
		Resetting device	Figure
		Wedge If brake piston is sluggish ↓ Replace brake caliper (4)	Fig 2
			AR42.10-P-0070MMI
	Clean
12	Clean contact surfaces of brake linings (3) on brake caliper (4)	Do not damage the brake piston dust boots. Do not use sharp-edged or pointed objects. The brake caliper (4) must otherwise be replaced.
		Assembly cleaner	*BR00.45-Z-1028-04A
13	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
14	Operate the brake pedal several times until brake linings (3) contact the brake disks	Firm resistance should be noticeable at the brake pedal.
	Check
15	Check fluid level in brake fluid reservoir, and correct if necessary
			AP42.10-P-4210V
16	Carry out brake test on the test stand
			AP42.00-P-4290BA

Fig 2: Identifying Wedge (601 589 07 63 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Resetting Device (000 589 52 43 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Lever (123 589 13 33 00)

Courtesy of MERCEDES-BENZ USA