Check Thickness And Condition Of Brake Disks - AR42.10-P-0120LWO

Model 238 

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
Topical note	Notes on handling, transport and storage of composite brake disks		AH42.10-P-9406-12LF
	Remove
1	Detach complete wheels		AR40.10-P-1102A
	Measure
2	Measure thickness of brake disks (1) on front and rear axles using vernier caliper	Model 238.314/315/342/414/415/442 with code P31 (AMG Line exterior) Model 238.314/315/342/414/415/442 with code U29 (Brake system with larger brake disks on the front axle) Model 238.314/342 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Model 238.315/348/366/385/415/448 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Model 238.334/365/434/465/466 Model 238.343/443 Model 238.348/366/385/448 with code P31 (AMG Line exterior) Model 238.348/366/385/448 with code U29 (Brake system with larger brake disks on the front axle) Model 238.414/442 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Brake disk thickness	*BE42.10-P-1001-08DA
		Model 238.314/315/342/343/348/415/442/443/448 Model 238.334/385/434 Model 238.365/366/465/466Brake disk thickness	*BE42.10-P-1001-09BA
		Caliper gauge	Fig 1
		If the wear limit has been exceeded or will be exceeded before the next brake lining change. ↓ Replace brake disks (1).	AR42.10-P-0220LWO
	Check
3	Check brake disks (1) on front and rear axle for score marks, cracks and chippings	For perforated brake disks or those provided with sunk holes (1) assess the crack length (x) including the bore diameter. Model 238.314/315/342/414/415/442 with code P31 (AMG Line exterior) Model 238.314/315/342/414/415/442 with code U29 (Brake system with larger brake disks on the front axle) Model 238.314/342 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Model 238.315/348/366/385/415/448 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Model 238.334/365/434/465/466 Model 238.343/443 Model 238.348/366/385/448 with code P31 (AMG Line exterior) Model 238.348/366/385/448 with code U29 (Brake system with larger brake disks on the front axle) Model 238.414/442 except code P31 (AMG Line exterior) except code U29 (Brake system with larger brake disks on the front axle) Check brake disks	*BE42.10-P-1002-08DA
		Model 238.314/315/342/343/348/414/415/442/443/448 Model 238.334/385/434 Model 238.365/366/465/466Check brake disks If a problem arises ↓ Replace brake disks (1).	*BE42.10-P-1002-09BA
			AR42.10-P-0220LWO
4	Check brake disks (1) on front and rear axle for corrosion, ridging at outer edge and for soiling (oil, grease)	If a problem arises ↓ Clean or replace brake disks (1).	AR42.10-P-0220LWO
		Assembly cleaner	*BR00.45-Z-1028-04A
	Install
5	Attach complete wheels		AR40.10-P-1102A

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 238.314/342 except code P31/ U29, model 238.377/414/442/477 except code 088/ P31/U29	Model 238.314/315/342/ 377/380/387/414/41 5/ 442/477/480/487 with code P31/U29
BE42.10-P-1001-08DA	Brake disk thickness	New	mm	28	32
		Wear limit	mm	25, 4	30

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation			Model 238.315/318/348/366 /380/383/385/386/38 7/415/418/448/480/4 83/485/487 except code P31/U29, model 238.343/378/443/478, model 238.377/414/442/477 with code 088	Model 238.318/348/366/38 3/385/386/418/448/483/485 with code P31/U29, model 238.323/334/361/36 5/368/423/434/461/4 65/466/468
BE42.10-P-1001-08DA	Brake disk thickness	New	mm	32	36
		Wear limit	mm	29, 4	34

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			Model 238.314/315/318/342 /343/348/377/378/38 0/387/414/415/418/4 42/443/448/477/478/ 480/487	Model 238.323/334/368/38 3/385/386/423/434/4 68/483/485
BE42.10-P-1001-09BA	Brake disk thickness	New	mm	22	24
		Wear limit	mm	19, 4	21, 4

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation			Model 238.361/365/366/46 1/465/466
BE42.10-P-1001-09BA	Brake disk thickness	New	mm	26
		Wear limit	mm	23, 4

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation				Model 238.314/342 except code P31/ U29, model 238.377/414/442/477 except code 088/ P31/U29	Model 238.314/315/342/ 377/380/387/414/41 5/ 442/477/480/487 with code P31/U29
BE42.10-P-1002-08DA	Check brake disks	Crack length	Dimension "x"	mm	< 25	< 25
		Crack depth		mm	< 0, 5	< 0, 5

CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number	Designation				Model 238.315/318/348/366 /380/383/385/386/38 7/415/418/448/480/4 83/485/487 except code P31/U29, model 238.343/378/443/478, model 238.377/414/442/477 with code 088	Model 238.318/348/366/38 3/385/386/418/448/4 83/485 with code P31/U29, model 238.323/334/361/36 5/368/423/434/461/4 65/466/468
BE42.10-P-1002-08DA	Check brake disks	Crack length	Dimension "x"	mm	< 25	< 25
		Crack depth		mm	< 0, 5	< 0, 5

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation				Model 238.314/315/318/342 /343/348/377/378/38 0/387/414/415/418/4 42/443/448/477/478/ 480/487	Model 238.323/334/368/38 3/385/386/423/434/4 68/483/485
BE42.10-P-1002-09BA	Check brake disks	Crack length	Dimension "x"	mm	< 25	< 25
		Crack depth		mm	< 0, 5	< 0, 5

CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number	Designation				Model 238.361/365/366/46 1/465/466
BE42.10-P-1002-09BA	Check brake disks	Crack length	Dimension "x"	mm	< 25
		Crack depth		mm	< 0, 5

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

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1028-04A	Assembly cleaner	A 000 986 56 01