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Section 6
6.4 BRAKE ADJUSTMENT
Figure 6.4
Design of pneumatic wheel axle brake
(1) expander arm, (2) expander shaft, (3) adjustment bolt, (4) pneumatic cylinder, (5) cylinder piston
rod, (6) cylinder fork, (7) cylinder pin
Considerable wear of brake shoe linings
results in increased brake cylinder rod
stroke and worse braking efficiency.
During braking, the brake cylinder piston
TIP
The correct stroke of the piston rod should be in the
range of 25–45 mm.
stroke should be within the specified op-
erating range and the angle between
brake cylinder piston (1) and expander
arm (3) should be about 90° figure (6.6),
6.6
PRONAR T700M/1
4
figure (6.7). Trailer wheels must brake
simultaneously.
Braking force decreases also when the
operating angle of the brake cylinder rod
(5) – figure (6.4), (6.5) in relation to the
expander arm (1) is wrong. In order to
obtain the optimal mechanical operating
angle, the cylinder piston fork (6) must
be installed on the expander arm (1) as
to ensure that the operating angle at full
braking is about 90°.
The inspection involves measuring the
Maintenance
5
7
1
2
6
3
589-J.02-1
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