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Brake Interlock Solenoid Valve
The brake interlock solenoid valves (see Figure 6-45) are three-way, electrically controlled, normally
closed valves which control service brake application for the interlock system. The brake interlock
solenoid valves for both the front and rear brakes can be found under the floor in the driver's seat area.
When the interlock system engages the service brakes, the coil in the solenoid energizes causing the inlet
port to open and the exhaust port to close. A speed switch prevents interlock activation above 3 mph.
The coach operator must not use the interlock system to stop the bus.
Doing so may damage the brakes.
During normal vehicle operation the coil is de-energized and the service brakes are disengaged. When
the coil is energized, the inlet port is opened to the delivery port and the exhaust port is closed.
Gillig coaches have a four wheel interlock system. Adjust the interlock pressure regulator setting when
necessary to maintain a pressure setting of 23 ± 3 psi.
Brake interlock solenoid valves are not rebuildable; if one becomes defective, replace with a new unit.
Air System
Figure 6-45, Brake Interlock Solenoid Valve
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Troubleshooting
Need help?
Do you have a question about the LOW FLOOR and is the answer not in the manual?
Questions and answers
How do you bypass the accelerator lockout switch
Gillag LF 07. Stopped driving brakes stayed on. Reset when restarted but still won’t go into gear.
A GILLIG Low Floor LF 07 may stop driving with the brakes engaged and not go into gear after a restart due to a suspension failure causing a sudden loss of air pressure. The vehicle's emergency brake protection valve is designed to maintain safe air brake pressure in such cases. If the suspension system loses air, the brakes may remain engaged, preventing the bus from moving or shifting into gear. Checking the air system and ensuring proper air pressure in the suspension may help resolve the issue.
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will low oil cause the engine to shut off
Yes, low oil pressure can cause the engine to shut off in a GILLIG Low Floor bus. The bus is equipped with an automatic shutdown system that activates when the engine detects a serious problem, such as low oil pressure or high temperature. When this happens, the "Stop Engine" indicator lamp and an alarm will activate, giving the driver only 30 seconds to safely park before the engine shuts down.
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