DAF LF45, LF55 Series. Manual — part 461

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200436

2-23

Inspection and adjustment

BRAKE SYSTEM AND COMPONENTS

ΛΦ45/55 series

6

4

2.16 CHECKING AUTOMATIC DISC BRAKE SLACK ADJUSTER, WABCO MODEL

1.

Place chocks in front of and behind the

wheels to prevent the vehicle from moving.

2.

Put the parking brake in the driving position.

3.

Remove the wheel.

4.

Remove the covering cap from the slack

adjuster.

5.

Fit a ring spanner on the hexagonal adjusting

bolt (7) and turn it anticlockwise (2-3 clicks).

6.

Leave the ring spanner on the adapter and

depress the brake pedal 5 times at an output

pressure of 1 bar.

7.

Check that the ring spanner makes a

clockwise turn every time the pedal is

depressed. The turns of the ring spanner

must decrease in line with the clearance.

8.

Place the cap back on the slack adjuster.

R600515

7

BRAKE SYSTEM AND COMPONENTS

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200436

Inspection and adjustment

4

ΛΦ45/55 series

6

2.17 CHECKING AUTOMATIC DISC BRAKE SLACK ADJUSTER, KNORR MODEL

1.

Place chocks in front of and behind the

wheels to prevent the vehicle from moving.

2.

Put the parking brake in the driving position.

3.

Remove the wheel.

4.

Remove the covering cap from the slack

adjuster.

5.

Fit a ring spanner on the adapter and turn the

hexagonal adjusting bolt together with the

adapter anti-clockwise (2-3 clicks).

Note:

Never turn the hexagonal adjusting bolt

without using an adapter. The adapter is a

torque safety and will break off when the

torque is too high. Without the use of an

adapter the mechanics in the brake calliper

may become damaged when the torque is

too high, so that replacement of the brake

calliper may be necessary.

6.

Leave the ring spanner on the adapter and

depress the brake pedal 5 to 10 times at an

output pressure of 2 bar.

7.

Check that the ring spanner makes a

clockwise turn every time the pedal is

depressed. The turns of the ring spanner

must decrease in line with the clearance.

8.

After the inspection, lightly grease the

sealing cap (see "Technical data") and

replace it on the slack adjuster.

R600468

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200436

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Inspection and adjustment

BRAKE SYSTEM AND COMPONENTS

ΛΦ45/55 series

6

4

2.18 INSPECTING BRAKE CALLIPER PLAY, KNORR MODEL

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 (so without the use of tools)

along the full distance (more than 25 mm).

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

BRAKE SYSTEM AND COMPONENTS

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Inspection and adjustment

4

ΛΦ45/55 series

6

2.

Push the brake calliper as far as possible

towards the brake calliper support (C).

3.

Measure the distance "X".

4.

Push the reversed brake calliper as far as

possible towards the brake calliper

support (D).

5.

Measure the distance "Y".

6.

Calculate the difference between the

measured distances, "Y" - "X" (see

"Technical data").

7.

Fit the brake pads.

X

R600710

C

Y

R600711

D