Inspect condition of brake disks

AP42.10-D-4258H

Inspect condition of brake disks

28.03.2018

Model

900, 906

Disk brake example

010

Vernier caliper

1

Brake disk

2

Crack length

 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

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A



Remove

1

Remove wheels



AR40.10-D-1100H



Check

2

Check brake disks (1) on front and rear axle for score marks and cracks

 Cracks can occur due to high stress.

 Brake disks (1) must be replaced for a crack length (x) > 25 mm, gaping cracks or score marks deeper than 0.5 mm or pitted corrosion or deeply contoured ridging at the outer edge.

For gaping cracks or score marks deeper than 0.5 mm or pitted corrosion or deeply contoured ridging at the outer edge:



Replace brake disks (1) on each axle, subject to separate repair order.



Remove/install front axle brake disk

AR42.10-D-0230H



Remove/install rear axle brake disk

AR42.10-D-0240H



Measure

3

Measure thickness of brake disks on front and rear axles using caliper gauge (010)

Model 900, 906 front axleBrake disk

*BE42.10-N-1001-08B

Model 900, 906 rear axleBrake disk thickness

*BE42.10-N-1001-09B

 Caliper gauge

*140589001900

Observe recommended limit dimensions. If the wear limit has been exceeded or will be exceeded before the next brake pad change:



Replace brake disks (1) on each axle, subject to separate repair order.



Remove/install front axle brake disk

AR42.10-D-0230H



Remove/install rear axle brake disk

AR42.10-D-0240H



Install

4

Mount wheels



AR40.10-D-1100H

Check values for front axle brake disks

Number

Designation

Model 900

Model 906

BE42.10-N-1001-08B

Brake disk

Thickness when new

mm

28

28

Wear limit

mm

25

25

Lateral runout

mm

 0,03

 0,03

Flatness deviation

mm

 0,04

 0,04

Repair limit dimension

mm

-

-

Check values for rear axle brake disks

Number

Designation

Model 900.63

Model 900.65

BE42.10-N-1001-09B

Brake disk thickness

New

mm

16

28

Wear limit

mm

14

25

Max. lateral runout

mm

0,03

0,03

Max. axial runout

mm

0,05

0,05

Repair limit dimension

mm

-

-

Check values for rear axle brake disks

Number

Designation

Model 906.11/13/21/23/61/63/71/73

Model 906.15/25/65

BE42.10-N-1001-09B

Brake disk thickness

New

mm

16

28

Wear limit

mm

14

25

Max. lateral runout

mm

0,03

0,03

Max. axial runout

mm

0,05

0,05

Repair limit dimension

mm

-

-