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

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MODEL 117, 156, 176, 242, 246 

MODIFICATION NOTES

13.10.14 Brake disk thickness MODEL 242.848/890 except CODE 952 BE42.10-P-1001-08T
13.10.14 brake disc thickness MODEL 242.848/890 except CODE 952 BE42.10-P-1001-08T
13.2.15 brake disc thickness MODEL 176.000 except CODE 950, MODEL
176.011/012 except CODE 950/952, MODEL
176.042 with CODE 4U3/R00 MODEL 176.041 with CODE 4U3/R00 except CODE 950/952		 BE42.10-P-1001-08H
Fig 1: Inspecting Brake Disks Condition
G10038094Courtesy 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-4050AK
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 brake disk thickness on front axle using vernier caliper (010) Model 117, 242, 246, check values for front axle brake disks *BE42.10-P-1001-08T 
Model 156, check values for front axle brake disks *BE42.10-P-1001-08V 
Model 176, check values for front axle brake disks *BE42.10-P-1001-08H 
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:
↓
Install new brake disks (1) at front axle.		 Figure
REMOVING Remove     
4 Remove brake linings on rear axle    
REFER TO TESTING & REPAIR   AR42.10-P-1700NKB
  IMPORTANT The brake disk thickness can only be measured on removed brake linings.  
MEASURING Measure     
5 Measure brake disk thickness at rear axle using vernier caliper (010) Model 117, 242, 246, check values for rear axle brake disks *BE42.10-P-1001-09S 
Model 156, check values for rear axle brake disks *BE42.10-P-1001-09V 
Model 176, check values for rear axle brake disks *BE42.10-P-1001-09T 
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:
↓
Install new brake disks (1) at rear axle.		 Figure
INSTALLING Install     
6 Install brake linings on rear axle    
REFER TO TESTING & REPAIR     AR42.10-P-1700NKB
7 Mount wheel and tire assembly   AP40.10-P-4050AK
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 176.000 except CODE 950, MODEL 176.011/012 except CODE 950/952, MODEL 176.042 with CODE 4U3/R00 MODEL 176.041 with CODE 4U3/R00 except CODE 950/952 MODEL 176.001/003/043 except CODE 950/952, MODEL 176.002/005/046, MODEL 176.008/047 except CODE 950, MODEL 176.041/042 except CODE 4U3/950/952/R00
BE42.10-P-1001-08H Brake disk thickness New mm 28, 0 28
Wear limit mm 25, 4 26
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 176.000/001/008/011/012/042/043 with CODE 950, MODEL 176.001/011/012/042/043 with CODE 952, MODEL 176.041 with CODE 950/952 except CODE 4U3/R00 MODEL 176.003/007/044/047 with CODE 950, MODEL 176.003/044 with CODE 952, MODEL 176.044 with CODE P84
BE42.10-P-1001-08H Brake disk thickness New mm 30 25, 0
Wear limit mm 28 22, 4
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 176.044 except CODE 950/952/P84 MODEL 176.052
BE42.10-P-1001-08H Brake disk thickness New mm 30, 0 32, 0
Wear limit mm 27, 4 30, 0
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 117.301/302/303/305/308/312/343/347/902/903/905/908/912/943 except CODE 950, MODEL 117.342/942 except CODE 4U3/950, MODEL 117.345 MODEL 117.301/302/305/308/312/342/343/902/908/912/943 with CODE 950, MODEL 117.942 with CODE 950 except CODE 4U3
BE42.10-P-1001-08T Brake disk thickness New mm 28, 0 28
Wear limit mm 25, 4 26
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 117.303/344/346/347/350/351/903/905/944/946/951 with CODE 950, MODEL 117.350/351/944/946/951 with CODE 951 MODEL 117.342 with CODE 4U3, MODEL 117.942 with CODE 4U3 except CODE 950
BE42.10-P-1001-08T Brake disk thickness New mm 30 25, 0
Wear limit mm 28 22, 4
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 117.344/346/350/351/944/946/951 except CODE 950/951 MODEL 117.352/952
BE42.10-P-1001-08T Brake disk thickness New mm 30, 0 32
Wear limit mm 27, 4 30
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 242.848/890 with CODE 952 MODEL 242.848/890 except CODE 952
BE42.10-P-1001-08T Brake disk thickness New mm 28 28, 0
Wear limit mm 26 25, 4
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 246.200/201/212/242/243 with CODE 950, with CODE 952, MODEL 246.211 with CODE 950//952 except CODE 965/970/974/975, MODEL 246.241 with CODE 950/952 except CODE 4U3/R00 MODEL 246.200/212/242/247 except CODE 950/952, MODEL 246.202/205/208, MODEL 246.211 except CODE 950/952/965/970/974/975, MODEL 246.241 with CODE 4U3/R00 except CODE 950/952
BE42.10-P-1001-08T Brake disk thickness New mm 28, 0 25, 0
Wear limit mm 26, 0 22, 4
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 246.201/203/243 except CODE 950/952, MODEL 246.207 except CODE 952, MODEL 246.211 with CODE 965/970/974/975 except CODE 950/952, MODEL 246.241 except CODE 4U3/950/952/R00 MODEL 246.203/207/244/246/247 with CODE 952, MODEL 246.203/244/246/247 with CODE 950
BE42.10-P-1001-08T Brake disk thickness New mm 28, 0 30, 0
Wear limit mm 25, 4 28, 0
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 246.244 except CODE 950, except CODE 952
BE42.10-P-1001-08T Brake disk thickness New mm 30, 0
Wear limit mm 27, 4
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 156.902/905/942, MODEL 156.903/908/912/943 except CODE 950, MODEL 156.947 with productions location in China MODEL 156.903/944 with CODE 950, MODEL 156.945/946, MODEL 156.947 except production location in China
BE42.10-P-1001-08V Brake disk thickness New mm 28, 0 30, 0
Wear limit mm 25, 4 28, 0
Wear limit for maintenance service mm 25, 9 25, 5
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 156.908/912/943 with CODE 950 MODEL 156.944 except CODE 950
BE42.10-P-1001-08V Brake disk thickness New mm 28, 0 30, 0
Wear limit mm 26, 0 27, 4
Wear limit for maintenance service mm 26, 5 27, 9
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation MODEL 156.952
BE42.10-P-1001-08V Brake disk thickness New mm 32, 0
Wear limit mm 30, 0
Wear limit for maintenance service mm 30, 5
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 117.301/303/305/308/312/343/344/345/347/350/903/908/912/943/944, MODEL 117.346/946 with CODE 494, MODEL 117.351/951 with CODE 494 except CODE 951/P84, MODEL 117.942 except CODE 4U3 MODEL 117.342 with CODE 4U3
BE42.10-P-1001-09S Brake disk thickness New mm 10, 0 22, 0
Wear limit mm 8, 3 19, 4
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 117.302/902/905, MODEL 117.346/946 except CODE 494, MODEL 117.351/951 with CODE 494+951+P84 MODEL 117.352/952
BE42.10-P-1001-09S Brake disk thickness New mm 22 22
Wear limit mm 19, 4 20
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 242.848/890 MODEL 246.200/201/203/207/208/212/242/243, MODEL 246.211/241 except CODE 965/970/974/975
BE42.10-P-1001-09S Brake disk thickness New mm 10, 0 9, 0
Wear limit mm 8, 3 7, 3
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 246.202/205/244/246/247, MODEL 246.211/241 with CODE 965/970/974/975
BE42.10-P-1001-09S Brake disk thickness New mm 10, 0
Wear limit mm 8, 3
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 176.000/001/007/008/011/012/041/042/043 MODEL 176.002/003/005/044/047, MODEL 176.046 except CODE P84
BE42.10-P-1001-09T Brake disk thickness Brake pad, new mm 9, 0 10, 0
Wear limit mm 7, 3 8, 3
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 176.046 with CODE P84 MODEL 176.052
BE42.10-P-1001-09T Brake disk thickness Brake pad, new mm 22, 0 22, 0
Wear limit mm 19, 4 20, 0
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 156.90/91/942/943/94 4/945/947 MODEL 156.946
BE42.10-P-1001-09V Brake disk thickness New mm 10, 0 22, 0
Wear limit mm 8, 3 19, 4
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation MODEL 156.952
BE42.10-P-1001-09V Brake disk thickness New mm 22, 0
Wear limit mm 20, 0
Fig 2: Identifying Caliper Gauge (140 589 00 19 00)
G10038095Courtesy of MERCEDES-BENZ USA
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