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Home >> Mercedes Benz >> 2017 >> GT AMG >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brakes - Hydraulic & Mechanical System (1 Of 2) -- 190 Chassis >> Testing & Repair >> Check Thickness And Condition Of Brake Disks - AR42.10-P-0120RG

Check Thickness And Condition Of Brake Disks - AR42.10-P-0120RG

Model 190 

G16681734Courtesy of MERCEDES-BENZ USA

Shown on right side of vehicle except code B07 (AMG - ceramic brake system) 

WARNING 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
Notice  Notes on evaluating brake disks with and without wear holes   AH42.10-P-9406-14A 
Notice  Notes on handling, transport and storage of ceramic brake disks   AH42.10-P-9406-13A 
Notice  Notes on handling, transport and storage of composite brake disks   AH42.10-P-9406-12LF 
  Notes on safety-relevant components   AH00.00-Z-0019-01A
REMOVING Remove     
1 Remove wheel and tire assemblies.   AR40.10-P-1100RQ
MEASURING Measure     
2 Measure thickness of brake disks (1) on front and rear axles using vernier caliper. Model 190
except code B07 (AMG - ceramic brake system)
 
    Check brake disks *BE42.10-P-1002-09X 
    Brake disk thickness *BE42.10-P-1001-09X 
    Brake disk thickness *BE42.10-P-1001-08ZA 
    SPECIAL TOOL Caliper gauge Fig 1
    If the wear limit has been exceeded or will be exceeded before the next brakepad change.

replace brake disk (1) in pairs.
 
    Remove/install brake disk (1) on front axle AR42.10-P-0230RG 
    Remove/install brake disk (1) on rear axle AR42.10-P-0240RG 
INSPECT Check     
3 Check brake disk (1) on front and rear axle for corrosion, score marks, cracks and chippings. Model 190
except code B07 (Brake calipers painted yellow)
 
    IMPORTANT If the brake disk (1) is perforated or is provided with sunk holes, assess the crack length (x) including the bore diameter.  
    Check brake disks *BE42.10-P-1002-08ZA 
    If there is a problem,

replace brake disk (1) in pairs.
 
    Remove/install brake disk (1) on front axle AR42.10-P-0230RG 
    Remove/install brake disk (1) on rear axle AR42.10-P-0240RG 
4 Check brake disk (1). Model 190
with code B07 (AMG - ceramic brake system)
AR42.10-P-0270RG 
    If there is a problem,

replace corresponding brake disk (1).
 
    Remove/install brake disk (1) on front axle AR42.10-P-0230RG 
    Remove/install brake disk (1) on rear axle AR42.10-P-0240RG 
INSTALLING Install     
5 Attach wheel and tire assemblies.   AR40.10-P-1100RQ
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation Model 190 except code B07 (AMG - ceramic brake system)
BE42.10-P-1001-08ZA Brake disk thickness New mm 36, 00
Wear limit mm 33, 00
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation Model 190 except code B07 (AMG - ceramic brake system)
BE42.10-P-1001-09X Brake disk thickness New mm 26, 00
Wear limit mm 24, 00
CHECK VALUES FOR FRONT AXLE BRAKE DISKS

Number Designation Model 190 except code B07 (AMG - ceramic brake system) Model 190 with code B07 (AMG - ceramic brake system)
BE42.10-P-1002-08ZA Check brake disks Crack length Dimension "x" mm < 25 -
Crack depth   mm < 0, 5 -
CHECK VALUES FOR REAR AXLE BRAKE DISKS

Number Designation Model 190 except code B07 (AMG - ceramic brake system)
BE42.10-P-1002-09X Check brake disks Crack length Dimension "x" mm < 25
Crack depth   mm < 0, 5
Fig 1: Identifying Caliper Gauge (140 589 00 19 00)
G10038065Courtesy of MERCEDES-BENZ USA