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

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MODEL 204 

Fig 1: Inspecting Brake Disk Condition
G07069171Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
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
NOTES Notes on repairs to brake system   AH42.00-P-0003-01A 
1 Remove wheels   AP40.10-P-4050CW
2 Remove brake pads on rear axle Model 204.077/277 AR42.10-P-0250CMG
INSPECT Checking     
3 Check brake disks (1) at front and rear axle IMPORTANT Inspect for scores and cracks. Hairline 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. In the event of gaping cracks and scores deeper than 0.5 mm replace brake disks (1):
↓
 
  Model 204.0/2/9 except 204.077/277:  
  Remove/install brake disk, brake caliper and brake pads of the front wheel brake:  
  With divided brake caliper support AR42.10-P-0225CV 
  With undivided brake caliper support AR42.10-P-0225CW 
  Removing/installing brake disk, brake caliper and pads of rear wheel brake
Model 204.077/277:
AR42.10-P-0250CW 
  Remove/install brake disk, brake caliper and brake pads of the front wheel brake AR42.10-P-0225CMG
  Removing/installing brake disk, brake caliper and pads of rear wheel brake AR42.10-P-0250CMG
MEASURING Measure     
4 Measure thickness of brake disks on front and rear axles using caliper gauge SPECIAL TOOL (010) IMPORTANT Observe recommended limit dimensions so that the wear limit is not dropped below before the next brake pad change, if necessary replace brake disks (1):
↓
 
  Model 204.0/2/9 except 204.077/277:  
  Remove/install brake disk, brake caliper and brake pads of the front wheel brake:  
  With divided brake caliper support AR42.10-P-0225CV 
  With undivided brake caliper support AR42.10-P-0225CW 
  Removing/installing brake disk, brake caliper and pads of rear wheel brake
Model 204.077/277:
AR42.10-P-0250CW 
  Remove/install brake disk, brake caliper and brake pads of the front wheel brake AR42.10-P-0225CMG
  Removing/installing brake disk, brake caliper and pads of rear wheel brake AR42.10-P-0250CMG
  Test values for front axle *BE42.10-P-1001-08P 
  Test values for rear axle *BE42.10-P-1001-09O 
  SPECIAL TOOL Fig 2
5 Install in the reverse order    
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 204.054/081 without code 494/950/952
BE42.10-P-1001-08P Brake disk thickness New mm 28
Wear limit mm 25, 4
Wear limit for maintenance service  mm 26
Wear test Sheet -
TEST VALUES FOR FRONT BRAKE DISKS

Number Designation Model 204.054/081 with code 494 and 952 Model 204.054/081 without code 494, with code 950/952
BE42.10-P-1001-08P Brake disk thickness New mm 28 32
Wear limit mm 26 30
Wear limit for maintenance service  mm 26.5 30, 5
Wear test Sheet - -
TEST VALUES FOR REAR BRAKE DISKS

Number Designation Model 204.054 with code 950/952
BE42.10-P-1001-09O Brake disk thickness New mm 10
Wear limit mm 8.3
Wear limit for maintenance service  mm 8.8
Wear test Sheet -
Fig 2: Identifying Vernier Caliper (140 589 00 19 00)
G07069172Courtesy of MERCEDES-BENZ USA