DAF CF65, CF75, CF85 Series . Manual — part 911

©

200423

2-29

Inspection and adjustment

BRAKE SYSTEM AND COMPONENTS

ΧΦ65/75/85 series

6

5

Glazing of brake linings
"Glazing" is the slow deterioration of the brake
lining's coefficient of friction. This is caused by
very light braking. Assessment of the braking
surface is very difficult.
Glazing only rarely occurs with modern linings.
The wearing surface of the lining collects small
particles of materials having lubricant properties.
Generally, these particles are removed by
braking hard a view times, or by turning the lining.
This creates a new wearing surface.

The stability of the coefficient of friction may vary
considerably, depending on the quality of the
lining.
It is therefore vital that original brake linings be
used at all times.

2.19 INSPECTION, BRAKE PADS

Inspecting Knorr SB7000 brake pads
With wheels fitted:

If the guide sleeve (4) no longer protrudes (C)
from the guide bush (6) but is flush with it
(detail A), the brake pad thickness
must be inspected with the wheels removed.
See "Technical data".

R600132

min. 75%

C

1

4

6

R600481

A

BRAKE SYSTEM AND COMPONENTS

2-30

©

200423

Inspection and adjustment

5

ΧΦ65/75/85 series

6

Inspecting Knorr SN7000 brake pads
With wheels fitted:

The brake pad thickness can be checked on the
basis of the position of the guide bush relative
to the rubber bush.

At maximum brake pad thickness the rubber
cover is stretched. Wear of the brake pads and
movement of the brake calliper along the guide
bushes will cause the rubber cover to roll up.

As soon as the transition from the ribbed section
of the rubber cover to the smooth section (A)
starts to roll inward, the brake pad thickness
is to be checked with the wheels removed.
See "Technical data".

A

A

A

R600730

©

200423

2-31

Inspection and adjustment

BRAKE SYSTEM AND COMPONENTS

ΧΦ65/75/85 series

6

5

2.20 INSPECTION, BRAKE DISCS

1.

Remove the wheels.

2.

Measure the disc thickness at different
points to find the thinnest measurement.
Compare the reading with the technical data.
See "Technical data".

3.

Check the brake discs for signs of wear.
See "Technical data".

Note:
The brake discs may be turned.
See "Technical data".

BRAKE SYSTEM AND COMPONENTS

2-32

©

200423

Inspection and adjustment

5

ΧΦ65/75/85 series

6

2.21 INSPECTION, BRAKE CALLIPER PLAY

Inspection of the free movement of the brake
calliper guide over the brake calliper carrier is the
most important thing. That is why initially a simple
inspection is carried out on the vehicle of the axial
movement of the brake calliper when it is fitted.

General inspection
1.

Push and pull the brake calliper back and
forth several times in the axial direction (A).
This requires considerable effort.

2.

Check the play of the brake calliper in the
axial direction (A). See "Technical data".
If the measured play is incorrect or the brake
calliper cannot be moved along the guide
bushes, it must be checked in more detail as
follows.

Inspection of sliding ability
1.

Remove the brake pads.

2.

Turn the thrust pieces back completely using
the adjusting bolt and the adapter.

3.

Clean the guide bushes where they are
accessible.

4.

Check whether the brake calliper can be
moved by hand along the full distance
(more than 25 mm) (so without the use of
tools).

Inspecting guide bush bearing play
1.

Pull the brake calliper as far as possible
towards the outside of the vehicle (B).

R600708

A

B

R600709