It could be a very wide range of reasons. A further diagnosis is needed in order for an assessment to be made.
Compressed air.
You must have air in the system. Get your brakes checked ASAP !
Check your brake power booster
Yes they do, and they feel about the same to the operator of the vehicle.
Pneumatic schematic in the air brakes in any type or build of truck all work in coordination with each other for smooth driving. The brakes would not be able to smoothly stop without them.
If the brakes were working before bleeding and now are worse, then is possible all of the air is not out of the system. Check the wheel cylinders and master cylinder for leaks, and re check any parts just replaced. It is possible that the last repair done to the system caused the problem.
Air brake systems have a belt driven air compressor on the motor that feeds an air tank. The air tank has a "pop off valve" that lets off air pressure so the tank doesn't over fill with air. The air tank is connected to the brakes with tubes. In modern air brake systems the brakes are held open by the air pressure that fights springs that push the brakes closed. This is so if the system fails ( loses air pressure ) the brakes will be applied. When the operator depresses the brake peddle the air pressure is released from the brakes and the springs push them against the drum or rotor.
No, they use air pressure or actually the lack of air pressure to stop the vehicle. The brakes are fully on until pressure builds up in the tank releasing the brakes. When you push the brake pedal this removes air from the system and applies the brakes.
We would need to know what type of brakes you have... S-cam air brakes, air disc brakes, air piston brakes, air wedge brakes, hydraulic drum brakes, hydraulic disc brakes... they're all different.
You have to replace the gasket because when you take the manifold off it brakes the seel and air will be sucked into the manifold and your vehicle will hardly run, and you wont be able to drive it You have to replace the gasket because when you take the manifold off it brakes the seel and air will be sucked into the manifold and your vehicle will hardly run, and you wont be able to drive it
Air brakes are just as effective as a standard set of brakes. The advantages to air brakes are that you do not have to worry about leaking brake fluid.
Airbrakes on commercial aircraft are hydraulically operated.