Page 25 - KNORR Pneumatic Disc Brake

5

Functional and Visual Check

5.4 Checking of Sealing Elements
9 5 10

Caliper Guide Pin Seals
5.4.1. The guide pin (5) (as fitted to the long bearing
side) is sealed with cover (10) and inner boot (9). The short
bearing side with guide pin (4c or 4d) is also sealed with
inner boot (9) and with cover (68c or 68d). The parts (9),
(10), (68c) or (68d) must be free of any signs of damage
(see Fig.).
Long bearing side
Check for correct location and fitting.
9 4 68
If necessary, remove pads (12) to inspect the inner boots
(9) (see section 6.1).

If necessary, repair caliper with suitable service kit (see
Section 1.2 and Section 8).

Short bearing side

Checking of Tappet and Boot Assemblies (13) 5.4.1 - Checking of guide pin and seals

If necessary remove pads (12) (see Section 6.1). < 30 mm

5.4.2. Screw out the tappets (13) using the shear adapter
(61) clockwise (see Section 5.2) until the boots are clearly
visible (see Fig).

The tappets must not be extended more than 30 mm, 13
otherwise synchronisation is lost and the caliper
must be replaced.

5.4.2 - Screw out tappets - max. 30 mm

5.4.3. The rubber boots on the tappets (13) must not
have any cuts/tears or show any other signs of damage
(see Fig.).
Check for correct location and fitting.

Note: The penetration of dirt and moisture into the brake
will lead to corrosion and impair the function of the
clamping mechanism and wear adjuster.
If necessary replace tappet and boot assemblies (see
Section 7).

5.4.3 - Check rubber boots for damage

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