Assess condition of brake linings - AP42.10-P-4252GC

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MODEL 251

Fig 1: Checking Lining Thickness

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Lining Thickness, Flashlight & Mirror

Courtesy of MERCEDES-BENZ USA

	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 death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Check
1	Assess lining thickness (1) of brake linings on front axle	If necessary, use flashlight (2) or mirror (3). The thickness of the pad backing plate can be used as a guide when assessing lining thickness (1).
1	Assess lining thickness (1) of brake linings on front axle	Brake lining thickness - front axle If, in exceptional cases, assessment by means of visual inspection is not possible: ↓ Detach wheel and tire assemblies and inspect them, subject to separate repair order.	*BE42.10-P-1001-05J
2	Assess lining thickness (1) of brake linings on rear axle	If necessary, use flashlight (2) or mirror (3). The thickness of the pad backing plate can be used as a guide when assessing lining thickness (1).
2	Assess lining thickness (1) of brake linings on rear axle	Brake lining thickness - rear axle If, in exceptional cases, assessment by means of visual inspection is not possible: ↓ Detach wheel and tire assemblies and inspect them, subject to separate repair order.	*BE42.10-P-1001-15I
3	Determine likely remaining distance of brake linings		AP42.10-P-4253-03EW
3	Determine likely remaining distance of brake linings	If the wear limit for the brake linings is reached, the brake linings must be replaced subject to separate repair order. Otherwise the braking effect may be impaired and people, property and environmental damage may result! Per axle, the brake pad with the least lining thickness (1) is to be used for determining the likely remaining distance. In order to avoid an unscheduled workshop visit between services, it is necessary to determine the remaining distance of the present brake linings. If the remaining distance determined is smaller than the next service interval, premature brake pad replacement should be recommended to the customer.	AP42.10-P-4253-03EW

CHECK VALUES FOR FRONT BRAKE LINING

Number	Designation			MODEL 251
BE42.10-P-1001-05J	Brake lining thickness	new (with pad backing plate)	mm	19, 75
		new (without pad backing plate)	mm	14
		Wear limit (without pad backing plate)	mm	≤2
		Wear limit (with pad backing plate) for maintenance service	mm	≤11, 8
		Wear limit (without pad backing plate) for maintenance service	mm	5, 8
		Wear indicator activated (if installed)	mm	2...3

CHECK VALUES FOR REAR BRAKE LINING

Number	Designation			MODEL 251.077/177	MODEL 251 (except 251.077/177)
BE42.10-P-1001-15I	Brake lining thickness	new (with pad backing plate)	mm	16, 5	17
		new (without pad backing plate)	mm	11	12
		Wear limit (without pad backing plate)	mm	≤2	≤2
		Wear limit (with pad backing plate) for maintenance service	mm	≤10	≤10
		Wear limit (without pad backing plate) for maintenance service	mm	4, 5	5
		Wear indicator activated (if installed)	mm	2...3	2...3