Could be,
the brake pad wear indicators,
rust,
Air pressure within the air braking system of a tractor-trailer (or large truck) is what prevents the brakes from being applied. The pressure of the air pushes back a large spring at each wheel. The large spring will apply the brakes when there is no pressure in the system. When the driver steps on the brake pedal, air is released out of the system and the brakes are applied. When the driver's foot comes off the brake pedal, air is quickly pumped back into the system and the brakes are released. Disconnecting the air line has the same effect on the trailer's brakes. Air is released from the system, and the brakes are applied. It is not the brakes themselves that lock. Application of the brakes causes the wheels to lock.
The hold off diaphragm on an air brake system is at the bottom of the maxi-spring within the hold off chamber of spring brakes. Air from the system pushes against the hold off diaphragm and prevents spring pressure being applied to the push rod until the air supply is released.
Only if the brakes are not being released due to the clogged brake line. Jack up vehicle and see if tire spins free, if so more than likely the bearings are bad. If the tire doesn't spin your brakes are stuck applied and that friction is causing the hub to get hot.
the brakes were applied very hard and the engine light came on and the truck just idled fast with out being able to step on the gas , idled in to parking lot shut off truck and then the truck worked and engine light went off.
That sound it the air being aloud to escape from the air system though the quick release valve. This usally happens when the driver has applied the parking brakes. But, it can happen during other times you dont want it to.
Inertia. A body in motion will remain in motion unless acted upon by an outside force. The motion of the bus is stopped by the brakes. The person inside keeps moving as it is not being braked.
If a car is shaking when the brakes are being applied, it is likely that the front end is out of alignment. The tie rod ends or shocks could also need replacing. You may also find that the brake rotors are warped.
No, work is not done if the force is applied to a mass but the mass does not move. Work is only done when a force causes a displacement in the direction of the force being applied.
When the brakes are applied on a moving car, the frictional pads of the brakes are forced against the rotating parts of the car, such as the brake discs or drums. This friction converts the kinetic energy of the moving car into heat energy, slowing down and stopping the car.
The force that causes a spring in a force meter to stretch is the tension or pull applied to the spring by an external force. The spring resists this force by elongating, allowing the force meter to measure the magnitude of the force being applied.
Rear brakes sees less use than front brakes, so may often benefit from being brushed clean and lubed every now and then
Loaded, between 250 and 300 feet, if the brakes are cool before being applied. With brakes already hot, it may take up to twice that distance. Keep this in mind before you decide to cut directly in front of one.