
Originally Posted by
lowslowbenz
Bus brakes are operated by air, when the handbrake is applied, in an air brake system (truck), a bypass valve sends air pressure to ALL brake wheels. This is also being supported by a mechnical system that locks the brake pad/shoes in place should the system run out of air. In US built trucks, this is the norm. Pag naka lock ang air brakes, hindi talaga gagalaw ang truck, no matter how steep the incline is.
IMHO, this was negligence on part of the driver. Or maybe the bus was not maintained properly. Sad.