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Home >> Mercedes Benz >> 2008 >> E550 Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes -- Maintenance -- E550 (211.072) >> Maintenance >> Inspect condition of brake disks - AP42.10-P-4258R

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

MODEL 211.004/006/007/008/016/020/022/023/024/026/028/029/041/042/052/054/056/057/061/065/070/072/076/077/080/082/083/084/087/089/090/092/206/207/208/216/220/222/223/226/241/242/252/254/256/257/261/265/270/272/276/277/280/282/283/284/287/289/290/292/606/608/616/620 

MODEL 230.454/456/458/467/470/471/472/474/475/476/477/479 

Fig 1: Inspecting Brake Discs
G07502719Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Identifying Hairline Crack Length
G07502720Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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
1 Remove wheel-and-tire assembly   AP40.10-P-4050Z
2 Remove brake pads on rear axle    
REFER TO TESTING & REPAIR Remove/check/install rear axle brake pads. Model 230.470/472/474/476/477/479 AR42.10-P-1700RA
INSPECT Checking     
3 Check brake disks (61) for score marks and hairline cracks IMPORTANT Hairline cracks can occur due to high stress.  
    IMPORTANT Ventilated, brake disks (61) with perforations and without perforations do not have to be replaced if the hairline crack length (1) is a maximum of 25 mm.  
    IMPORTANT On perforated brake disks (61), the hairline crack length (1) including the hole diameter must be measured.  
    With gaping hairline cracks and scores deeper than 0.5 mm: ↓  
REFER TO TESTING & REPAIR   Replace brake disks. AR42.10-P-0220R
MEASURING Measure     
4 Measure thickness of brake discs on front and rear axles using caliper gauge (035) SPECIAL TOOL IMPORTANT Observe wear limits of brake disks (61) so that these are not dropped below up to the next maintenance service, if necessary:  
    ↓  
    Replace brake disks. AR42.10-P-0220R
REFER TO TESTING & REPAIR   Test values for brake disks:  
    Model 211 AP42.10-P-4251-01T 
    Model 230 AP42.10-P-4251-01R
    SPECIAL TOOL Measuring caliper Fig 3
5 Install in the reverse order    
Fig 3: Identifying Vernier Caliper (140 589 00 19 00)
G07502721Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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