Check thickness and condition of brake disks

AR42.10-P-0120MFA

Check thickness and condition of brake disks

09.09.2019

Model

177

1

Brake disk

x

Crack length

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Warning

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

Remove wheel and tire assemblies.

AR40.10-P-1102MFA



Measure

2

Measure thickness of brake disks (1) on front and rear axles with vernier caliper.

Model 177.003/082/084/087/103/187
with code U29 (Brake system with larger brake disks on the front axle)
Model 177.003/082/084/103/984
with code 950 (AMG Sports package)
Model 177.003/082/084/103
except code 950 (AMG Sports package)
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.045/046/047/051/144/145
with code 950 (AMG Sports package)
Model 177.045/046/047/051/144/145
with code U29 (Brake system with larger brake disks on the front axle)
Model 177.045/046/047/144/145
except code 950 (AMG Sports package)
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.051
except code 950 (AMG Sports package)
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.087/187
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.984
except code 950 (AMG Sports package)
Model 177.987Brake disk thickness

*BE42.10-P-1001-08FA

Model 177.003/051/082/084/087/103
with code U29 (Brake system with larger brake disks on the front axle)
Model 177.003/082/084/087/103
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.045/046/047/144/145
Model 177.051
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.187/987
Model 177.984Brake disk thickness

*BE42.10-P-1001-09DA

 Caliper gauge

*140589001900

If the wear limit has been exceeded or will be exceeded before the next brakepad change.



Replace brake disks (1).

AR42.10-P-0220MFA



Check

3

Check brake disks (1) on front and rear axle for corrosion, 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 177.003/045/046/047/051/082/084/087/103/144/145/187
with code U29 (Brake system with larger brake disks on the front axle)
Model 177.003/045/046/047/051/082/084/103/144/145/984
with code 950 (AMG Sports package)
Model 177.003/045/046/047/051/082/084/103/144/145
except code 950 (AMG Sports package)
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.087/187
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.984
except code 950 (AMG Sports package)
Model 177.987Check brake disks

*BE42.10-P-1002-08FA

Model 177.003/051/082/084/087/103
except code U29 (Brake system with larger brake disks on the front axle)
Model 177.003/051/082/084/087/103
with code U29 (Brake system with larger brake disks on the front axle)
Model 177.045/046/047/144/145/187/984/987Check brake disks

*BE42.10-P-1002-09DA

If complaints are present,



Replace brake disks (1).

AR42.10-P-0220MFA



Install

4

Install wheel and tire assemblies.

AR40.10-P-1102MFA

Check values for front axle brake disks

Number

Designation

Model 177.002/003/082/084/103/184 except code 950/U29,
model 177.984 except code 950

Model 177.002/003/082/084/103/184/984 with code 950,
model 177.012/013/087/112/187 except code U29,
model 177.987

BE42.10-P-1001-08FA

Brake disk thickness

New

mm

24

28

Wear limit

mm

21,4

25,4

Check values for front axle brake disks

Number

Designation

Model 177.002/003/012/013/053/054/082/084/087/103/112/151/184/187 with code U29,
model 177.014/015/044/045/046/047/051/086/114/144/145/146/147/186 with code 950/U29,
model 177.945 with code 950

Model 177.014/015/044/045/046/047/086/114/144/145/146/147/186 except code 950/U29,
model 177.945 except code 950

BE42.10-P-1001-08FA

Brake disk thickness

New

mm

30

30

Wear limit

mm

28

27,4

Check values for front axle brake disks

Number

Designation

Model 177.051 except code 950/U29
model 177.151 except code U29
model 177.951

BE42.10-P-1001-08FA

Brake disk thickness

New

mm

32

Wear limit

mm

30

Check values for rear axle brake disks

Number

Designation

Model 177.002/003/012/082/084/087/103/112/184 except code U29
model 177.013/014 except code 950/U29
model 177.984

Model 177.002/003/012/051/053/054/082/084/087/103/112/151/184 with code U29
model 177.013/014 with code 950/U29
model 177.015/044/086/114/146/147/186/187/945/987

BE42.10-P-1001-09DA

Brake disk thickness

New

mm

11

12

Wear limit

mm

9,3

10,3

Check values for rear axle brake disks

Number

Designation

Model 177.045/046/047/144/145/951,
model 177.051/053/054/151 except code U29

BE42.10-P-1001-09DA

Brake disk thickness

New

mm

22

Wear limit

mm

20

Check values for front axle brake disks

Number

Designation

Model 177.002/003/082/084/103/184 except code 950/U29,
model 177.984 except code 950

Model 177.002/003/082/084/103/184/984 with code 950,
model 177.012/013/087/112/187 except code U29,
model 177.987

BE42.10-P-1002-08FA

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 177.002/003/012/013/053/054/082/084/087/103/112/151/184/187 with code U29,
model 177.014/015/044/045/046/047/051/086/114/144/145/146/147/186 with code 950/U29,
model 177.945 with code 950

Model 177.014/015/044/045/046/047/086/114/144/145/146/147/186 except code 950/U29,
model 177.945 except code 950

BE42.10-P-1002-08FA

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 177.051 except code 950/U29
model 177.151 except code U29
model 177.951

BE42.10-P-1002-08FA

Check brake disks

Crack length

Dimension "x"

mm

< 25

Crack depth

mm

< 0,5

Check values for rear axle brake disks

Number

Designation

Model 177.002/003/012/082/084/087/103/112/184 except code U29
model 177.013/014 except code 950/U29
model 177.984

Model 177.002/003/012/051/053/054/082/084/087/103/112/151/184 with code U29
model 177.013/014 with code 950/U29
model 177.015/044/086/114/146/147/186/187/945/987

BE42.10-P-1002-09DA

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 177.045/046/047/144/145/951,
model 177.051/053/054/151 except code U29

BE42.10-P-1002-09DA

Check brake disks

Crack length

Dimension "x"

mm

< 25

Crack depth

mm

< 0,5