#Air t post driver traqctor supply manual#

This shoves them apart and against the inside of the brake drum. In this type of brake, the brake chamber push rod pushes a wedge directly between the ends of two brake shoes. When you release the brake pedal, the s-cam rotates back and a spring pulls the brake shoes away from the drum, letting the wheels roll freely again. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. This turns the s-cam (so called because it is shaped like the letter 'S'). Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake camshaft. When you push the brake pedal, air is let into each brake chamber. Too much heat can make the brakes stop working. The heat a drum can take without damage depends on how hard and how long the brakes are used. This causes friction, which slows the vehicle (and creates heat). To stop, the brake shoes and linings are pushed against the inside of the drum. The braking mechanism is inside the drum. Brake drums are located on each end of the vehicle's axles. The parts of the brake are discussed below.Д«rake Drums, Shoes, and Linings. The most common type is the s-cam drum brake. 5.1.8 - Foundation BrakesДЇoundation brakes are used at each wheel. If the pressure gets too low, the brakes won't work. Pressing and releasing the pedal unnecessarily can let air out faster than the compressor can replace it. It must be made up by the air compressor. Releasing the brakes lets some compressed air go out of the system, so the air pressure in the tanks is reduced. Letting up on the brake pedal reduces the air pressure and releases the brakes. (It is also called the foot valve or treadle valve.) Pushing the pedal down harder applies more air pressure.

You put on the brakes by pushing down the brake pedal. If the safety valve releases air, something is wrong. The valve is usually set to open at 150 psi. The safety valve protects the tank and the rest of the system from too much pressure.

(Unless the system has automatic drain valves.) 5.1.6 - Safety ValveДЄ safety relief valve is installed in the first tank the air compressor pumps air to. Daily air tank drainage is still needed to get rid of water and oil. Ice inside the system can make the brakes stop working.Д¬heck the alcohol container and fill up as necessary, every day during cold weather. This helps to reduce the risk of ice in air brake valves and other parts during cold weather. Some air brake systems have an alcohol evaporator to put alcohol into the air system. These help prevent freezing of the automatic drain in cold weather.

#Air t post driver traqctor supply manual#

These tanks may be equipped for manual draining as well.ДЄutomatic air tanks are available with electric heating devices. Automatic-the water and oil are automatically expelled.You must drain the tanks yourself at the end of each day of driving. Manually operated by turning a quarter turn or by pulling a cable.Each air tank is equipped with a drain valve in the bottom. Be sure that you drain the air tanks completely. The water and oil tend to collect in the bottom of the air tank. For example, the water can freeze in cold weather and cause brake failure. 5.1.4 - Air Tank DrainsД¬ompressed air usually has some water and some compressor oil in it, which is bad for the air brake system. The tanks will hold enough air to allow the brakes to be used several times, even if the compressor stops working. The number and size of air tanks varies among vehicles.

5.1.3 - Air Storage TanksДЄir storage tanks are used to hold compressed air. When the tank pressure falls to the 'cut-in' pressure (around 100 psi), the governor allows the compressor to start pumping again. When air tank pressure rises to the 'cut-out' level (around 125 pounds per-square-inch or 'psi'), the governor stops the compressor from pumping air. The governor controls when the air compressor will pump air into the air storage tanks. If the compressor has its own oil supply, check the oil level before driving. It may have its own oil supply or be lubricated by engine oil. The compressor may be air cooled or may be cooled by the engine cooling system. The air compressor is connected to the engine through gears or a v-belt. The air compressor pumps air into the air storage tanks (reservoirs). You should know about the parts discussed here. There are many parts to an air brake system. Florida CDL Handbook: The Parts of an Air Brake System