Trailer Brake Drive; General Information; Combined Trailer Brake Pneumatic Drive - Belarus 920.4 Operating Manual

BELARUS-920.4/952.4

2.4 Trailer brake drive

2.4.1 General information

Your tractor can be equipped with a combined trailer brake pneumatic drive or trailer brake
hydraulic drive. Short information about the design and main adjustments of the combined trailer
brake pneumatic drive is presented in the Section 2.4.2. Short information about the design and
main adjustments of the trailer brake hydraulic drive is presented in the Section 2.4.3.
ATTENTION: PERFORM ADJUSTMENT OR TROUBLESHOOTING OF THE
TRACTOR TRAILER BRAKE SYSTEM AND BRAKE DRIVE ONLY WHEN THE ENGINE
IS SHUT OFF AND THE TRACTOR IS ON AN EVEN SURFACE, BLOCKED WITH BRAKE
SHOES PUT UNDER THE WHEELS, WHICH EXCLUDE SPONTANEOUS MOVEMENT OF
THE TRACTOR.

2.4.2 Combined trailer brake pneumatic drive

2.4.2 General information
BELARUS-920.4/952.4 tractors can be equipped with a combined trailer brake pneumatic
drive.
The pneumatic drive can also be used to inflate tires and for other purposes, where energy
of compressed air is required.
Figure 2.6 shows the pneumatic drive diagram.
1, 4, 5 - coupling heads; 2 - control manifold; 3 - brake valve (single-wire); 6 – connecting
line; 7 – supply line; 8 - line from engine intake manifold; 9 – compressor; 10 – air bleed valve; 11
- pressure regulator; 12 – condensate drain valve; 13 - cylinder; 14 - air pressure sensor; 15 -
emergency air pressure sensor; 16 - brake valve (single-wire).
Figure 2.6 – Trailer brake pneumatic drive diagram
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