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Section 6
2
Figure 6.6
Principle of pneumatic brake adjustment
(1) brake cylinder piston rod, (2) brake cylinder membrane, (3) expander arm, (4) adjustment bolt,
(5) brake cylinder fork, (6) fork pin, (7) brake cylinder bracket, (A) mark on the cylinder piston rod at
brake release position, (B) mark on the cylinder piston rod at full braking position, (C) position of arm at
brake release position, (D) position of arm at full braking position
• Make sure that the trailer brakes are
not engaged.
• Secure the trailer against moving by
placing wheel chocks.
• On the piston rod (1), figure (6.6),
(6.7) of the cylinder mark with a line
(A) the position of the maximum re-
traction of the piston rod with the
trailer brake turned off.
• Press the tractor brake pedal and
mark the position of the maximum
extension of the brake cylinder piston
rod with a line (B).
6.8
PRONAR T700M/1
B
A
7
A
C
D
1
6
3
• Measure the distance between lines
(A) and (B). If the stroke of the brake
cylinder piston rod is outside the
proper operating range (25 – 45 mm),
adjust the expander arm.
• Dismantle brake cylinder fork pin (6).
• Remember or mark the original po-
sition of pin (6) in expander arm
opening (3).
• Check if the brake cylinder piston rod
moves freely and within the whole
nominal range.
• Check if the brake cylinder vent holes
Maintenance
25-45 mm
5
4
589-J.04-1
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