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

Model 171, 172 

MODIFICATION NOTES

22.01.2016

Brake disk thickness

Model 172.466/475

BE42.10-P-1001-09D

Model 171 shown 

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
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Remove
1	Remove wheel-and-tire assembly		AP40.10-P-4050V
	Check
2	Check brake disks (1) on front and rear axle for score marks and cracks	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)	Check values for front axle brake disks Brake disk thickness	*BE42.10-P-1001-08D
		Check values for rear axle brake disks Brake disk thickness	*BE42.10-P-1001-09D
		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) subject to separate repair order.	Fig 1
	Install
4	Mount wheel and tire assembly		AP40.10-P-4050V

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 171.442	Model 171.445/454/456
BE42.10-P-1001-08D	Brake disk thickness	New	mm	25	28
		Wear limit	mm	22, 4	25, 4

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 171.473	Model 171.458
BE42.10-P-1001-08D	Brake disk thickness	New	mm	32	28
		Wear limit	mm	30	26

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 172.403/404 except code 950 (AMG Sports package) except code 952 (Sports package) Model 172.434/435/438 except code 950 (AMG Sports package) except code 951 (Sports package USA) except code 952 (Sports package) Model 172.447 except code 494 (US version) except code 950 (AMG Sports package) except code 951 (Sports package USA) except code 952 (Sports package) except code P88 (Edition 1)	Model 172.403/431/434/435/438/447/448 with code 950 (AMG Sports package) Model 172.403/431/434/435/438/447/448 with code 952 (Sports package) Model 172.431/434/435/438/447/448 with code 951 (Sports package USA) Model 172.447/448 with code P88 (Edition 1) Model 172.457
BE42.10-P-1001-08D	Brake disk thickness	New	mm	32	32
		Wear limit	mm	29, 4	30

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 172.404 with code 950 (AMG Sports package) Model 172.404 with code 952 (Sports package) Model 172.431 except code 950 (AMG Sports package) except code 951 (Sports package USA) except code 952 (Sports package) Model 172.447 with code 494 (US version) Model 172.448 except code 494 (US version) except code 950 (AMG Sports package) except code 951 (Sports package USA) except code 952 (Sports package) except code P88 (Edition 1) Model 172.448 with code 494 (US version)	Model 172.466/475
BE42.10-P-1001-08D	Brake disk thickness	New	mm	28	36
		Wear limit	mm	25, 4	34

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			Model 171.442/445 except code 952 (Sports package)	Model 171.442/445 with code 952 (Sports package) Model 171.454/456/458
BE42.10-P-1001-09D	Brake disk thickness	New	mm	9	10
		Wear limit	mm	7, 3	8, 3

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			Model 171.473	Model 172.403/404/431/434/435/438/447/448/457
BE42.10-P-1001-09D	Brake disk thickness	New	mm	26	10
		Wear limit	mm	24	8, 3

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			Model 172.466/475
BE42.10-P-1001-09D	Brake disk thickness	New	mm	22
		Wear limit	mm	20

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

Courtesy of MERCEDES-BENZ USA