Why does a truck make a big noise when it brakes?
When a braking action, the brake pedal is released, the high-pressure gas chamber for high pressure air brake, will open the valve from the discharged air pressure, air velocity at this time is amazing, so that "Chi" is a high speed gas truck brake assembly of high pressure gas chamber and air the exhaust generated sounds produced by friction.
Large trucks and vans are used for air brake brake assembly, brake braking element assembly is used the brake valve and brake relay valve, when the truck brake pedal when the pump chamber for rapid pressurization, brake pump as a support for stroke, promote the brake holding the hub, the frictional force generated enormous, in order to achieve the purpose of braking.
The big trucks use pneumatic brakes, which are the exhaust sounds of the brake assembly.
