Inspect Condition Of Brake Disks - AP42.10-P-4258A

Model 190 

except code B07 (AMG - ceramic brake system) 

Courtesy of MERCEDES-BENZ USA

	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
	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
Topical note	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on handling, transport and storage of composite brake disks		AH42.10-P-9406-12LF
	Remove
1	Remove wheel-and-tire assembly
			AR40.10-P-1100RQ
	Check
2	Check brake disks (1) on front and rear axle for score marks and cracks	Cracks can occur due to high stress.
		With perforated brake disks or those provided with sunk holes (1) measure the crack length (2) including the bore diameter.
		Caliper gauge	Fig 1
		In the event of a crack length (2) > 25 mm (0.98 inches) or gaping cracks or score marks deeper than 0.5 mm (0.02 inches): ↓ Replace brake disks (1) subject to separate repair order.
	Measure
3	Measure thickness of brake disks on front and rear axles using caliper gauge (010)	Front axle brake disk thickness Brake disk thickness	*BE42.10-P-1001-08ZA
		Rear axle brake disk thickness Brake disk thickness	*BE42.10-P-1001-09X
		Caliper gauge	Fig 1
		Observe recommended limit dimensions. If the wear limit has been exceeded or will be exceeded before the next brake pad change: ↓ Replace brake disks (1) subject to separate repair order.
	Install
4	Mount wheel and tire assembly
			AR40.10-P-1100RQ

Fig 1: Identifying Caliper Gauge (140 589 00 19 00)

Courtesy of MERCEDES-BENZ USA