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

WARNING: This page does not describe the selected car, but rather 203 other vehicles, including the 2020 Mercedes-Benz SLC300, 2020 Mercedes-Benz SL550, 2020 Mercedes-Benz SL450, 2020 Mercedes-Benz S65 AMG, and 2020 Mercedes-Benz GLA250. However, it is still accessible from the selected car via links, so may be relevant.

MODEL 203 

Fig 1: Inspecting Brake Disks Condition
G10038073Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Brake Disks Crack Length
G10038074Courtesy of MERCEDES-BENZ USA
REMOVING Removing     
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
DANGER Risk of injury  to skin and eyes caused by handling hot or glowing objects. Wear safety gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
1 Lift/jack up vehicle    
REFER TO TESTING & REPAIR Lift/jack up vehicle   AR00.60-P-1000P
2 Remove wheels   AP40.10-P-4050Z
INSPECT Checking     
3 Check brake disks (61) at front and rear axle IMPORTANT Inspect for scores and cracks. Hairline cracks can occur due to high stress.
IMPORTANT Brake disks (61) do not have to be replaced when the crack length (1) is a maximum of 25 mm.
With perforated brake disks (61) measure the crack length (1) inclusive of bore diameter.
In the event of gaping cracks and scores deeper than 0.5 mm replace brake disks (61):
↓		  
REFER TO TESTING & REPAIR   Remove/install brake disc. AR42.10-P-0220P
MEASURING Measure     
4 Measure thickness of brake discs on front and rear axles using caliper gauge (SPECIAL TOOL 035) IMPORTANT Observe wear limits of brake disks (61) so that these are not dropped below up to the next maintenance service, if necessary:
↓		  
REFER TO TESTING & REPAIR   Replace brake disks. AR42.10-P-0220P
Test values for front brake disks *BE42.10-P-1001-08K 
Test values for rear brake disks *BE42.10-P-1001-09P 
SPECIAL TOOL Vernier caliper Figure
INSTALLING Install     
5 Mount wheels   AP40.10-P-4050Z
6 Lower vehicle    
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.004/006/035/045/204/206/235/245/706/735/745 with code 494, 498, 625 Model 203.004/006/204/206 with code 949, 950 Model 203.004/006/204/206 except code 494, 498, 625, 949, 950, Model 203.035/045/235/245/706/735/745 except code 494, 498, 625
BE42.10-P-1001-08K Brake disk thickness New mm 25 28 25
Wear limit mm 22 26 22.4
Wear limit for maintenance service  mm 22.6 26.5 23
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.007/008 except code 949, 950
BE42.10-P-1001-08K Brake disk thickness New mm 25
Wear limit mm 22.4
Wear limit for maintenance service  mm 23
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.016/064/216/264/747 except code 494, 498, 625 Model 203.016/064/081/216/264/281 with code 494, 498, 625 Model 203.018/065/076/218/265/276
BE42.10-P-1001-08K Brake disk thickness New mm 28 28 30
Wear limit mm 25.4 26 27.5
Wear limit for maintenance service  mm 26 26.5 28
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.020/220 except code 949, 950 Model 203.020/220 with code 949, 950 Model 203.042/043/046/242/243/246/707/708/742/743/746 Model 203.207/208 without code 949, 950
BE42.10-P-1001-08K Brake disk thickness New mm 28 30 25
Wear limit mm 26 28 22.4
Wear limit for maintenance service  mm 26.5 28.5 23
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.052/252 with code 494, 498, 625 Model 203.052/252 with code 949, 950 Model 203.052/252 except code 494, 498, 625, 949, 950
BE42.10-P-1001-08K Brake disk thickness New mm 25 28 28
Wear limit mm 22.4 26 25.4
Wear limit for maintenance service  mm 23 26.5 26
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.040/240/740/747 with code 494, 498, 625 Model 203.040 with code 165 and 498, 165 and 625 Model 203.040/240 except code 494, 498, 625, 949, 950, 165 and 498, 165 and 625 Model 203.040/207/208/240 with code 949, 950
BE42.10-P-1001-08K Brake disk thickness New mm 25 28 28
Wear limit mm 22.4 25.4 26
Wear limit for maintenance service  mm 23 26 26.5
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.056/256 with code 494, 498, 625, Model 203.054/254 except code 949, 950 Model 203.056/256 with code 949, 950 Model 203.056/256 except code 494, 498, 625, 949, 950, Model 203.756, Model 203.054/254 with code 949, 950
BE42.10-P-1001-08K Brake disk thickness New mm 28 30 28
Wear limit mm 25.4 28 26
Wear limit for maintenance service  mm 26 28.5 26.5
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.061/081/261/281 except code 494, 498, 625, Model 203.061/261 except code 494 and 949, 494 and 950, 625 and 949, 625 and 950 Model 203.061/261 with code 494 and 949, 494 and 950, 625 and 949, 625 and 950 Model 203.061/261 with code 494, 498, 625
BE42.10-P-1001-08K Brake disk thickness New mm 28 28 25
Wear limit mm 25.4 26 22.4
Wear limit for maintenance service  mm 26 26.5 23
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 203.084/087/092/284/287/292/752/764 Model 203.718 Model 203.740 except code 494, 498, 625 Model 203.741 MODEL 203
BE42.10-P-1001-08K Brake disk thickness New mm 28 30 28
Wear limit mm 25.4 28 25.4
Wear limit for maintenance service  mm 26 28.5 26
TEST VALUES FOR REAR BRAKE DISKS

Number Designation Model 203.004/006/035/045/706/731/735/745 Model 203.007/008 without code 949 or 950 Model 203.007/008 with code 949 or 950
BE42.10-P-1001-09P Brake disk thickness New mm 9 9 10
Wear limit mm 7.3 7.3 8.3
Wear limit for maintenance service  mm 7, 6 7.8 8.8
TEST VALUES FOR REAR BRAKE DISKS

Number Designation Model 203.016/020/054/056/061/064/081/084/087/092/204/206/207/208/216/220/235/240/242/243/245/246/252/254/256/261/264/281/284/287/292/741/747/752/756/764 Model 203.018/218/718 Model 203.040/740 without code 498 or 625
BE42.10-P-1001-09P Brake disk thickness New mm 10 22 10
Wear limit mm 8.3 19.4 8.3
Wear limit for maintenance service  mm 8.8 20 8.8
TEST VALUES FOR REAR BRAKE DISKS

Number Designation Model 203.707/708/742/743/746, Model 203.040/740 with code 498 or 625 Model 203.042/043/046 with code 949 or 950 and 701 Model 203.042/043/046 without code 949 or 950 and 701
BE42.10-P-1001-09P Brake disk thickness New mm 9 10 9
Wear limit mm 7.3 8.3 7.3
Wear limit for maintenance service  mm 7.8 8.8 7.8
TEST VALUES FOR REAR BRAKE DISKS

Number Designation Model 203.052 with code 494, 498, 625, 498 and 165, 625 and 165 Model 203.052 without code 494, 498, 625, 498 and 165, 625 and 165 Model 203.065/076/265/276
BE42.10-P-1001-09P Brake disk thickness New mm 9 10 22
Wear limit mm 7.3 8.3 19.5
Wear limit for maintenance service  mm 7.8 8.3 20
Fig 3: Identifying Vernier Caliper (140 589 00 19 00)
G10038075Courtesy of MERCEDES-BENZ USA
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