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

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MODEL 171, 172 

Model 171 Shown 

Fig 1: Inspecting Brake Disks Condition
G10038108Courtesy of MERCEDES-BENZ USA
DANGER 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 Notes on repairs to brake system   AH42.00-P-0003-01A
REMOVING Remove     
1 Remove wheel-and-tire assembly   AP40.10-P-4050V
INSPECT Check     
2 Check brake disks (1) on front and rear axle for score marks and cracks IMPORTANT Cracks can occur due to high stress.
IMPORTANT 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.		  
MEASURING Measure     
3 Measure thickness of brake disks on front and rear axles using caliper gauge (010) Check values for front axle brake disks *BE42.10-P-1001-08D 
Check values for rear axle brake disks *BE42.10-P-1001-09D 
SPECIAL TOOL 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.		 Figure
INSTALLING 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 950/952, MODEL 172.434/438 except CODE 950/951/952, MODEL 172.447 except CODE 494/950/951/952/P88 MODEL 172.403/431/434/438/447/448 with CODE 950/952, MODEL 172.431/434/438/447/448 with CODE 951, MODEL 172.447/448 with CODE P88, 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 950/952, MODEL 172.431 except CODE 950/951/952, MODEL 172.447 with CODE 494, MODEL 172.448 with CODE 494 except CODE 950/951/952/P88 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 MODEL 171.442/445 with CODE 952, 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 172.403/404/431/434/438/447/448/457/475
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
BE42.10-P-1001-09D Brake disk thickness New mm 22
Wear limit mm 20
Fig 2: Identifying Caliper Gauge (140 589 00 19 00)
G10038109Courtesy of MERCEDES-BENZ USA
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