Page 33 - KNORR Pneumatic Disc Brake

7

Tappet and Boot Assemblies (13) and Inner Seals (22) Replacement

Inspection of Threaded Tube (16)
46
With caliper installed on vehicle: 16

7.1.5. Place a new brake pad (12) in the outboard
position and wind-out the threaded tube (16), by turning
the shear adapter (61), until it touches the brake disc.
Check the threads when winding-out for corrosion and
damage (see Fig.). 12
In case of water ingress or corrosion, the caliper must be
replaced (see Section 8).
Never turn adjuster (23) without shear adapter (61)
being fitted. If the shear torque of the shear adapter 7.1.5 - Inspection of threaded tube (installed on vehicle) using new brake pad
is exceeded, then it is designed to fail. Try again with
a new (unused) shear adapter. With a second failure
of the shear adapter the caliper must be replaced 70 mm
since internal damage is present.
Do not use an open-ended spanner on the shear adapter!

The threaded tubes must not extend more than
30 mm, otherwise synchronisation is lost and the
caliper must be replaced.

With caliper removed from vehicle: 1 S 16
7.1.6. If the caliper is not installed on the vehicle, place
spacer S (length = 70 mm) into the caliper (1) to avoid loss 7.1.6 - Inspection of threaded tube (removed from vehicle) using spacer
of thread engagement of the threaded tubes (16). Check the
threads when winding-out for corrosion and damage (see
Fig.). Y
In case of water ingress or corrosion, the caliper must be
replaced (see Section 8). 16
7.2 Replacement of Inner Seals (22)

With caliper installed on vehicle:

7.2.1. Fully wind back the threaded tubes (16) by turning 22
the shear adapter (61) (see Section 6.1.4).
7.2.2. Clean area of the inner seal (22) and then, using a suit-
able lever (Y), carefully remove the inner seal (22) (see Fig.). 7.2.2 - Clean area and remove inner seal
The sealing surface (X) for the inner seal (22), must
not be damaged else the caliper must be replaced. X
II14525
7.2.3. Clean sealing surface (X) (see Fig.). 16
7.2.4. Wind-out the threaded tubes via the shear adapter or
(61) to a maximum of 30 mm whilst at the same time inspecting II32868
them for corrosion or damage (see Section 7.1.5 -7.1.6)
7.2.5. Lubricate threads with white grease (Part No.
II14525 or II32868) and then wind back the threaded
tubes until they stop (see Fig.). 46 < 30 mm
7.2.6. Fit new inner seals (22) onto the threaded tubes (16)
and carefully push into position. 7.2.3 - 7.2.5 - Wind out threads, inspect, grease threads and wind back

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