8-54
Published 01-29-2014, Control # 496-00
UNDERCARRIAGE TMS800E SERVICE MANUAL
Dual Brake Valve
The dual brake valve is a suspended, pedal operated brake
valve which has two separate supply and delivery circuits.
The valve is located under the front console to the right of the
steering column. The valve provides the driver with a
graduated control for applying the service brakes or the
parking brakes through the spring brake control valve.
Spring Brake Control Valve
The spring brake control valve Figure 8-74 is located on the
rear of the carrier frame. The purpose of the valve is to
supply a specific, limited hold off pressure to the spring
brakes, and in the event of loss of primary pressure, to
modulate the spring brakes through use of the dual brake
valve.
Park Brake Control Valve
The park brake control valve is an on/off push/pull control
valve located on the front console. When the air pressure
reaches 3.40 bar (50 psi) and the button is pushed in, the
park brakes are disengaged. The button will pop out when
the air pressure falls below 2.80 bar (40 psi) exhausting the
delivery line and engaging the brakes.
Antilock Modulator
The quick release antilock system modulators are on/off air
valves that incorporate a pair of electrical solenoids for
control. The solenoids provide the electro-pneumatic
interface between the antilock controller electronics and the
air brake system. The modulator is used to control the
braking function on actuators during antilock activity.
Traction Control Valve
The traction control valve is installed on the right rear side of
the frame. It is used in the air system to improve stability and
traction during acceleration (at low speeds) and lateral
stability while driving around curves.
FIGURE 8-73
1
2
3
Item Description
1 Service Port
2 Supply Port
3 Delivery
FIGURE 8-74
1
2
3
4
Port Designation
1 Air Supply Port
2 Air Delivery Port
3 Air Exhaust Port
4 Park Control Port
Reference Only
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