What is parking brake control valve?
Tactair Emergency Park Brake Valves provide an alternate method of providing brake pressure upon a failure of the main system and provides parking brake pressure. Typically, the Emergency Park Brake Valve is paired with a hydraulic accumulator or separate hydraulic pressure source.
What is the trailer brake control valve?
DESCRIPTION. In a trailer air brake system, the SR-2™ spring brake valve controls the functioning of the spring brakes during parking and emergency applications. It is responsible for automatically applying the spring brakes and preventing trailer air pressure loss in the event of breakaway or supply line failure.
What is a hand control valve?
Hand Control Valve. Heavy duty, durable valve with a lever handle for manually reducing incoming pressure (50-120 PSIG) to desired output pressure. Locking feature for the handle adjustment allows operator to set desired output pressure. Used in auxiliary axle applications and raising/lowering of vehicle.
What does the trailer hand valve do?
The trailer hand valve is used to apply the trailer service brakes independent of the towing vehicle’s brakes. The trailer supply valve is usually a push/pull type valve near the driver that supplies air to the trailer’s brake system through the supply line.
When should you use the trailer brake hand valve?
The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. The foot brake sends air to all the brakes on the vehicle (including the trailer(s). There is much less danger of causing a skid or jackknife when using just the foot brake.
When should you use a hand valve?
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.
When should you use a hand valve to park a combination vehicle?
6.2. The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. The foot brake sends air to all of the brakes on the vehicle (including the trailer[s]).
When should you use your hand brake valve?
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid. 27.65 % of our users get this question wrong.