Page 24 - KNORR Pneumatic Disc Brake

5

Functional and Visual Check

Clearance Measurement of Bearing Variants (6)

Note: Before commencing (removing the wheel), make
sure there is no contact between caliper and axle, vehicle,
chassis sections or carrier.
To measure the clearance, the following steps must be
taken:

5.3.5. Remove the wheel, refer to vehicle manufacturer’s
recommendations.

5.3.6. Remove pad retainer (11) (see Section 6.1.2)
To achieve the correct reading it is necessary to have a pair of
new brake pads fitted.

If the clearance measuring is not taking place during a brake 5.3.7 - Slide caliper in outboard position as far as possible
pad replacement, the current position of the assembled pads
must be noted, so that they can be re-assembled in the same
position. 12 1
Remove old pads (see Section 6) (at this point Section
5.1 “Wear Check of Pads and Brake Discs” must also be
observed).

Fit new pads (see Section 6).
5.3.7. Slide the caliper to the outboard position as far as
possible (see Fig.).
5.3.8. Fasten a magnetic dial-gauge holder to the carrier
(2) on the short bearing side of the caliper (1). Use the
casting tag on the caliper (1) as the measuring point - see
arrows A (see Fig.). A A
5.3.9. Set the dial-gauge to zero.
5.3.10. Place a suitable tool (e.g. screwdriver with at least
200 mm in length) in a central position between carrier (2)
and caliper (1) and lever them in opposite directions (using 2
normal hand-force) (see Fig.).
5.3.11. Read the maximum value of the bearing clearance
on the dial-gauge and compare with the values in the table
(see Table).
If the clearance exceeds the given tolerance, the complete
bearing will need replacing using the relative service kit
(see Section. 1.2 and Section. 10.2).
5.3.9 - 5.3.10 - Obtaining maximum value of bearing clearance
If the clearance measuring is not taking place during a brake
pad replacement, the new pads should be removed and the
previously marked brake pads fitted in their original positions Bearing variants (6) Max. bearing clearance
(see Section 6).
6a 2 mm
5.3.12. Fit the wheel (refer to vehicle manufacturer’s 6b 2 mm
recommendations). After replacing the wheel check that it 6c 1 mm
runs interference free.
6d 2 mm

5.3.11 - Maximum bearing clearance tolerances of bearing variants

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