4.1 Controls and Instruments – 4 Brakes
Maintenance Manual Ottawa T2 4x2
mm mm mm mm mm mm
4 Brakes
4.1
Controls and Instruments
4.1.1 Foot
Pedal
(Treadle Valve)
page
–
Description
This foot-actuated valve is actually two valves that operate in
quick sequence. It is connected in the front and rear brake cir-
cuitry so that the rear brakes begin to act before the front
brakes when the operator steps on the pedal. When air pres-
sure is correct in both circuits, the second stage is driven via air
pressure by the first stage. If air is lost to the first stage, the sec-
ond stage is driven mechanically by the first stage.
4.1.9
Air Control Valves
page
–
Description
Instrument Panel 4 — Trailer Air Supply and
Tractor Parking Control Knobs
There are two air control valves on the instrument panel. The
tractor parking brake has a yellow knob. The trailer air supply
knob is red.
Normal vehicle operation with trailer in tow requires that both
knobs be depressed. All braking control then transfers to the
foot pedal.
Operating in bobtail mode requires that the red knob be pulled
out (stop trailer air supply) and the yellow knob be depressed
(release tractor parking brakes).
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