60
11
» Y081564 - (EN - REV. 003) | JUNE 2022
BRAKE ACTUATOR REPLACEMENT
Do not use grease containing molybdenum
disulphide. Use only actuators which are recommended
by the vehicle manufacturer.
Check function and effectiveness of the service
brake system and parking brake system.
11.4 Fitting of Knorr-Bremse Spring Brake
Note:
New spring brakes (18) have drain plugs installed (see
arrow
A
). Remove lowest plug (as viewed when spring brake is
installed). All other drain holes should be plugged. Refer to the
vehicle manufacturer’s recommendations.
11.4.1 The sealing surface and the flange surface (see Fig.
arrow
B
) must be:
- free from dust and corrosion
- free from damage
- flat
Take care that no dirt enters the brake caliper!
11.4.2 Before fitting the new spring brake, the spherical cup
(19) in the lever and the sealing surface must be greased
with white grease (Part No. II14525, K093430 or II32868).
11.4.4 Attach the spring brake using new nuts (see Fig.).
Note:
In order not to tilt the spring brake during its
attachment, the nuts must be gradually tightened symmetri-
cally with a suitable tool.
11.4.5 Tighten the nuts according to the specifications of
the actuator manufacturer.
Only use new nuts
11.4.6 Connect air hoses, making sure that the hoses are not
twisted and chafing is not possible.
11.4.7 Release parking brake.
11.4.8 Screw in spring brake release bolt as per instructions
on the spring brake itself.
11.4.9 Check air connections for leakage.
11.4.3 The seal, as well as the push rod area of the
spring brake (18) (see arrow
C
) must be clean and free of
lubrication.
The seal must not show any signs of damage.
Note, if the spring brake’s seal protrudes less than
3 mm
the
spring brake must be replaced (see Fig.).
11.4.3 - Check seal, min.
3 mm
11.4.4 - Knorr-Bremse spring brake fitting
11.4.1 - 11.4.2 - Check seal and flange surface of caliper,
grease spherical cup
A
19
B
C