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Home >> Mercedes Benz >> 2021 >> GLE350 Base >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brakes - Hydraulic & Mechanical System -- 167 Chassis (2 Of 2) >> Maintenance >> Assess Condition Of Brake Discs - AP42.10-P-4256EW

Assess Condition Of Brake Discs - AP42.10-P-4256EW

Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 190, 197, 203, 204, 205, 207, 209, 211, 212, 213, 216, 217, 218, 219, 221, 222, 230, 231, 238, 242, 245, 246, 247, 251, 253, 257, 290, 292, 293, 453, 461, 463 

Shown on model 223.063 

G15030882Courtesy of MERCEDES-BENZ USA

Damage profile on drilled brake disk with cast iron friction ring 

G15030883Courtesy of MERCEDES-BENZ USA

Damage profile on brake disk with cast iron friction ring 

G15030884Courtesy of MERCEDES-BENZ USA

One-piece, internally-ventilated, drilled brake disk with cast iron friction ring 

G15030885Courtesy of MERCEDES-BENZ USA

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

G15030886Courtesy of MERCEDES-BENZ USA

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

G15030887Courtesy of MERCEDES-BENZ USA

3-piece, internally ventilated, drilled compound brake disk with ceramic friction ring and aluminum pan 

G15030888Courtesy 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 discs Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 190, 197, 203, 204, 205, 207, 209, 211, 212, 213, 216, 217, 218, 219, 221, 222, 230, 231, 238, 242, 245, 246, 247, 251, 253, 257, 290, 292, 293, 461, 463 AH42.10-P-9406-12LF
Notice  Notes on handling, transport and storage of ceramic brake discs Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 190, 197, 203, 204, 205, 207, 209, 211, 212, 213, 216, 217, 218, 219, 221, 222, 230, 231, 238, 242, 245, 246, 247, 251, 253, 257, 290, 292, 293, 461, 463 AH42.10-P-9406-13A
INSPECT Check     
1.1 Assess brake discs (1) with a cast iron friction ring for soiling (e.g. oil, grease). Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 203, 204, 207, 209, 211, 216, 219, 221, 230, 238, 242, 245, 246, 247, 251, 257, 292, 293, 453, 461, 463
Model 190, 197, 205, 212, 213, 217, 218, 222, 231, 253, 290
except code B07 (AMG - ceramic brake system)
Model 205 with code B07 (AMG - ceramic brake system) and brake discs (1) with a cast iron friction ring on rear axle
If soiling (e.g. oil, grease) is present,

clean brake discs (1) with a cast iron friction ring; replace, if necessary.
IMPORTANT After obtaining special order.
 
1.2 Assess brake discs (1) with a ceramic friction ring for soiling. Model 190, 197, 205, 212, 213, 218, 231, 253, 290 with code B07 (AMG - ceramic brake system)
If the brake discs (1) with a ceramic friction ring are soiled with oil or grease,

replace brake discs (1) with a ceramic friction ring.
IMPORTANT After obtaining special order.
 
1.3 Assess brake discs (1) with a ceramic friction ring for soiling. Model 217, 222 with code B07 (AMG - ceramic brake system)
If the brake discs (1) with a ceramic friction ring are soiled with oil or grease,

Replace brake discs (1) with ceramic friction ring on each axle.
IMPORTANT After obtaining special order.
 
2.1 Assess brake discs (1) with a cast iron friction ring for damage, score marks, cracks and corrosion. Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 203, 204, 207, 209, 211, 216, 219, 221, 230, 238, 242, 245, 246, 247, 251, 257, 292, 293, 453, 461, 463
Model 190, 197, 205, 212, 213, 217, 218, 222, 231, 253, 290
except code B07 (AMG - ceramic brake system)
Model 205
with code B07 (AMG - ceramic brake system) and brake discs (1) with a cast iron friction ring on rear axle
IMPORTANT For brake discs (1) with a cast iron friction ring and bores, assess crack length (x) including bore diameter.
If crack length (x) is ≥ 25 mm (0.98 inch) or extends up to inner or outer edge of friction ring, if there are gaping cracks or score marks are deeper than 0.5 mm (0.02 inch), or if there is pitted corrosion:

replace brake discs (1) with a cast iron friction ring.
IMPORTANT After obtaining special order.
 
2.2 Assess brake discs (1) with a ceramic friction ring for damage. Model 167, 190, 197, 205, 212, 213, 218, 231, 253, 290
with code B07 (AMG - ceramic brake system)
 
REFER TO TESTING & REPAIR   IMPORTANT The wear on the brake discs (1) with a ceramic friction ring cannot be assessed through a visual check!
If there is damage to the brake discs (1) with ceramic friction ring that makes replacement necessary:

Replace brake discs (1) with ceramic friction ring.
IMPORTANT After obtaining special order.
AR42.10-P-0290-01RG
2.3 Assess brake discs (1) with a ceramic friction ring for damage. Model 217, 222
with code B07 (AMG - ceramic brake system)
 
REFER TO TESTING & REPAIR   IMPORTANT The wear on the brake discs (1) with a ceramic friction ring cannot be assessed through a visual check!
If there is damage to the brake discs (1) with ceramic friction ring that makes replacement necessary:

Replace brake discs (1) with ceramic friction ring on each axle.
IMPORTANT After obtaining special order.
AR42.10-P-0290-01RG
3.1 Assess brake discs (1) with a cast iron friction ring for wear. Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 203, 204, 207, 209, 211, 216, 219, 221, 230, 238, 242, 245, 246, 247, 251, 257, 292, 293, 453, 461, 463
Model 190, 197, 205, 212, 213, 217, 218, 222, 231, 253, 290
except code B07 (AMG - ceramic brake system)
Model 205 with code B07 (AMG - ceramic brake system) and brake discs (1) with a cast iron friction ring on rear axle
Brake disks (1) with a cast iron friction ring and with wear bores.
 
Notice  Notes on evaluating brake discs 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) with a cast iron friction ring are OK; new brake pads can still be installed on the brake discs (1) with cast iron friction ring.
If the inner wear bore (13) is visible,

Brake disks (1) with a cast iron friction ring are OK; the current brake pads can still be used, do not install any new brake pads onto the brake disk (1) with cast iron friction ring.
If none of the three wear bores are visible,

replace brake discs (1) with a cast iron friction ring.
IMPORTANT After obtaining special order.
If, in exceptional cases, assessment of the brake discs (1) with a cast iron friction ring is not possible through a visual check,

check condition of brake discs (1) with a cast iron friction ring.
IMPORTANT After obtaining special order.
AH42.10-P-9406-14A
3.2 Assess brake discs (1) with a cast iron friction ring for wear. Model 117, 118, 156, 164, 166, 167, 169, 171, 172, 176, 177, 203, 204, 207, 209, 211, 216, 219, 221, 230, 238, 242, 245, 246, 247, 251, 257, 292, 293, 453, 461, 463
Model 190, 197, 205, 212, 213, 217, 218, 222, 231, 253, 290
except code B07 (AMG - ceramic brake system)
Model 205 with code B07 (AMG - ceramic brake system) and brake discs (1) with a cast iron friction ring on rear axle
Brake disks (1) with a cast iron friction ring without wear bores.
 
Notice  Notes on evaluating brake discs with and without wear holes If deeply contoured ridging is present at the outer edge,

replace brake discs (1) with a cast iron friction ring.
IMPORTANT After obtaining special order.
If, in exceptional cases, assessment of the brake discs (1) with a cast iron friction ring is not possible through a visual check,

check condition of brake discs (1) with a cast iron friction ring.
IMPORTANT After obtaining special order.
AH42.10-P-9406-14A