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Home >> Mercedes Benz >> 2021 >> S580 >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brakes -- Hydraulic & Mechanical System (2 Of 2) -- 223 Chassis >> Maintenance >> Assess Condition Of Brake Disks - AP42.10-P-4256A

Assess Condition Of Brake Disks - AP42.10-P-4256A

Model 223 

except code B07 (AMG - ceramic brake system) 

2-piece, internally-ventilated, drilled compound brake disk with cast iron friction ring, steel pan and wear bores, shown on front left 

G16189206Courtesy of MERCEDES-BENZ USA

2-piece, internally-ventilated compound brake disk with cast iron friction ring, steel pan and with wear bores, shown at rear left 

G16189207Courtesy of MERCEDES-BENZ USA

2-piece, internally-ventilated, drilled, slit compound brake disk with cast iron friction ring, aluminum pan, shown on front left 

G16189208Courtesy of MERCEDES-BENZ USA

One-piece, internally-ventilated brake disk with cast iron friction ring, shown on front left 

G16189209Courtesy of MERCEDES-BENZ USA
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer. AS00.00-Z-0010-01A
Notice  Notes on handling, transport and storage of composite brake disks   AH42.10-P-9406-12LF
INSPECT Check     
1 Assess all brake disks (1) for score marks, cracks, corrosion and soiling (e.g. oil, grease). IMPORTANT For brake disks (1) with bores, assess crack length (x) including bore diameter.
If the crack length (x) is > 25 mm (0.98 Inch) or if it extends up to the inner or outer edge of the friction ring, if there are gaping cracks or score marks deeper than 0.5 mm (0.02 Inch), or where pitted corrosion is present,

replace brake disks (1).
IMPORTANT After obtaining special order.
If soiling (e.g. oil, grease) is present,

clean brake disks (1), replace if necessary.
IMPORTANT After obtaining special order.
 
2.1 Assess all brake disks (1) for wear. Brake disks (1) with wear bores.  
Notice  Notes on evaluating brake disks with and without wear holes If outer wear bore (11), center wear bore (12) and the inner wear bore (13) are visible,

Brake disks (1) are OK; new brake pads can be installed on the disks.
If the inner wear bore (13) is visible,

Brake disks (1) are OK: the current brake pads can still be used, do not install any new brake pads on the brake disks (1).
If none of the three wear bores are visible,

replace brake disks (1).
IMPORTANT After obtaining special order.
In exceptional cases, if an assessment of the brake disks (1) by visual check is not possible,

check condition of brake disks (1).
AH42.10-P-9406-14A
REFER TO TESTING & REPAIR   IMPORTANT After obtaining special order. AR42.10-P-0120S
2.2 Assess brake disks (1) for wear. Brake disks (1) without wear bores.  
Notice  Notes on evaluating brake disks with and without wear holes If deeply contoured ridging is present at the outer edge,

replace brake disks (1).
IMPORTANT After obtaining special order.
In exceptional cases, if an assessment of the brake disks (1) by visual check is not possible,

check condition of brake disks (1).
AH42.10-P-9406-14A
REFER TO TESTING & REPAIR   IMPORTANT After obtaining special order. AR42.10-P-0120S