Semi air brakes rely on compressors, reservoirs, dryers, valves, brake chambers, pushrods, and S-cams to move shoes or pads ...

Many of the larger vehicles on our roads have one intriguing thing in common: They can make sudden, loud, gas-escaping hissing noises. These noises, admittedly, have made this writer jump — on more ...

Add Yahoo as a preferred source to see more of our stories on Google. When the brakes are applied, circuits send compressed air from the storage tanks to front and rear service chambers that push the ...