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Air compressor / General system
Troubleshooting flowchart, air compressor
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Faults
05.11.2001
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Date
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Troubleshooting flowchart, air compressor
Text-module
Trailer does not brake (dual-line brake system)
Trailer does not brake (dual-
line brake system)
I
Storage pressure (7.0 to 8.1 bar)
No
Check tractor brake system
Yes
I
Check pressure in trailer control
line (yellow)
Pressure not OK
Check tractor brake system
approx. 7.0 to 8.0 bar
Check pressure build-up with
footbrake and handbrake
I
Pressure OK
I
Check pressure at trailer brake
cylinder and in air tank.
Pressure not OK
Check trailer brake valve, propor-
tioning valve, lines and hoses. Fit
new items if necessary
Bear proportioning valve setting
in mind!
Guidelines: empty approx.
2.0 bar; half load approx. 4.0 bar;
full load > 6.0 bar
I
Pressure OK
I
Check mechanical wheel brakes
and brake pads, set trailer brake
cylinders