Inspect condition of brake disks - AP42.10-P-4258GQ

MODEL 166 

Fig 1: Inspecting Brake Disks Condition

Courtesy of MERCEDES-BENZ USA

	Remove/install
	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
1	Remove wheel-and-tire assembly		AP40.10-P-4050EW
	Check
2	Check brake disks (1) at front and rear axle	Inspect for scores and cracks. Hairline cracks can occur due to high stress. Brake disks (1) do not have to be replaced when the crack length (2) is a maximum of 25 mm. With perforated brake disks or those provided with sunk holes (1) measure the crack length (2) including the bore diameter. For cracks and scores which have split open and are deeper than 0.5 mm: ↓ 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)	Brake disk thickness on front axle	*BE42.10-P-1001-08N
		Brake disk thickness on rear axle	*BE42.10-P-1001-09L
		Caliper gauge 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) on front axle subject to separate repair order.	Figure
	Install
4	Mount wheel and tire assembly		AP40.10-P-4050EW

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			MODEL 166.003/004/055 MODEL 166.006/023/024 without CODE Z04 (Light armoring) without CODE Z05 (B5 armoring on special protection version) MODEL 166.056/057/058/062/823/824/856 without CODE P31 (AMG Exterior Sports package) MODEL 166.056/062/856 with CODE 830 (Vehicles for China, additional parts) with CODE P31 (AMG Exterior Sports package) MODEL 166.057/058/062 with CODE 494 (US version) with CODE P31 (AMG Exterior Sports package) MODEL 166.064 without CODE P31 (AMG Exterior Sports package) without CODE Z04 (Light armoring) without CODE Z05 (B5 armoring on special protection version) MODEL 166.872 as of 9/14/13 with CODE 494 (US version)	MODEL 166.006/064/075 with CODE Z04 (Light armoring) MODEL 166.006/064/075 with CODE Z05 (B5 armoring on special protection version) MODEL 166.023/024 with CODE Z04 (Light armoring) MODEL 166.023/024 with CODE Z05 (B5 armoring on special protection version) MODEL 166.056/856 with CODE P31 (AMG Exterior Sports package) without CODE 830 (Vehicles for China, additional parts) MODEL 166.057/058 with CODE P31 (AMG Exterior Sports package) without CODE 494 (US version) MODEL 166.062 with CODE P31 (AMG Exterior Sports package) without CODE 494 (US version) without CODE 830 (Vehicles for China, additional parts) MODEL 166.063/073/864/865/871/873 MODEL 166.064/823/824 with CODE P31 (AMG Exterior Sports package) MODEL 166.872 up to 9/13/13 with CODE 494 (US version) MODEL 166.872 without CODE 494 (US version)
BE42.10-P-1001-08N	Brake disk thickness	New	mm	32	36
		Wear limit	mm	29, 4	33, 4

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			MODEL 166.074/874 MODEL 166.075 without CODE Z04 (Light armoring) without CODE Z05 (B5 armoring on special protection version)
BE42.10-P-1001-08N	Brake disk thickness	New	mm	36
		Wear limit	mm	34

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			MODEL 166.003/004/006/023/024 with CODE P31, MODEL 166.003/023 with CODE 494, MODEL 166.006/023/024/075 with CODE Z04/Z05, MODEL 166.055/057/058/062 except CODE 494, MODEL 166.055/057/058/062 with CODE 494+P31, MODEL 166.056/063/064/073/823/824/856/864/865/871/872/873	MODEL 166.003 except CODE 494/P31, MODEL 166.004 except CODE P31, MODEL 166.006/024 except CODE P31/Z04/Z05, MODEL 166.023 except CODE 494/P31/Z04/Z05, MODEL 166.055/057/058/062 with CODE 494 except CODE P31
BE42.10-P-1001-09L	Brake disk thickness	New	mm	22	14
		Wear limit	mm	19, 4	11, 4

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			MODEL 166.074/874, MODEL 166.075 except CODE Z04/Z05
BE42.10-P-1001-09L	Brake disk thickness	New	mm	26
		Wear limit	mm	24

Fig 2: Identifying Caliper Gauge (140 589 00 19 00)

Courtesy of MERCEDES-BENZ USA