Remove/install front axle brake disk - AR42.10-P-0230MCU

MODEL 451.3/4 

Fig 1: Identifying Brake Disk, Wheel Hub And Screw

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
1	Remove left or right engine support		AR42.10-P-0500MCU
2	Remove bolt (2) and remove brake disk (1)	Installation:  Brake disks (1) must only be replaced in pairs. Clean wheel hub (3) and grease lightly at the centering surface (A) using brake paste.
		Brake paste	*BR00.45-Z-1060-06A
	Checking
3	Check wear, condition of brake pads and the brake disk (1) using a vernier caliper	Brake pad thickness	*BE42.10-P-1001-05E
		Brake disk thickness	*BE42.10-P-1001-08E
			*450589011900
4	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
5	Operate the brake pedal several times until brake pads make contact with the brake disks (1)	A firm resistance must be noticeable at the brake pedal.

CHECK VALUES FOR FRONT BRAKE PAD

Number	Designation			Model 451.3/4
BE42.10-P-1001-05E	Brake pad thickness	New (with pad backing plate)	mm	15
		Wear limit (without pad backing plate) for maintenance service	mm	≤ 2
		Wear limit (with pad backing plate) for maintenance service	mm	≤7,7
		Response of wear indicator (with pad backing plate)	mm	≈7,7

TEST VALUES FOR FRONT BRAKE DISKS

Number	Designation			Model 451.3/4
BE42.10-P-1001-08E	Brake disk thickness	New	mm	9,7
		Wear limit	mm	8

Fig 2: Identifying Vernier Caliper (450 589 01 19 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1060-06A	Brake paste	Q0007414V000000000