Page 23 - KNORR Pneumatic Disc Brake

5

Functional and Visual Check

5.3 Caliper Check

Caliper Running Clearance
Before starting work, ensure that the wheels are
chocked and the vehicle cannot roll away.
Ensure that service brake and parking brake,
as well as the bus stop temporary hold brake, if
fitted, are in the released condition.

5.3.1. By pushing and pulling the caliper in an axial direc-
tion by hand, a movement within the running clearance
(see Section 5.2) must be possible (see Fig.).

If, even using a high level of hand pressure (no tools), the
caliper is not moveable the caliper guide pin seals must be 5.3.1 - Push and pull hand test
examined (see Section 5.4).

Caliper Movement along Guide Pins 13

5.3.2. Remove brake pads (see Section 6.1).

5.3.3. Rewind the tappets (13) completely back using a
ring spanner and shear adapter (61). Clean dirt inside and 4
out from guide bush (4) (see Fig).
5.3.3 -Rewind tappets completely

5.3.4. Caliper (1) must slide freely along the whole length
of the guide pin arrangement; movement should be greater 1
than 25 mm. (see Fig.).
If the caliper does not move at least 25 mm, the caliper
guide pin seals must be examined (see Section 5.4).

> 25 mm

5.3.4 - Free movement of caliper > 25 mm

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