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A sudden loss of air pressure would result in full spring brake pressure immediately. The service brakes are used while driving for slowing or stopping the vehicle. When the brake pedal is pushed to apply the service brakes, air is routed under pressure from a supply reservoir to the service brake chamber, causing the brake to be engaged.
Without relay valves, it would take too long for sufficient air to travel from the brake pedal valve to the rear of the truck or trailer in order to apply the rear service brakes concurrently with the front service brakes, resulting in a condition known as brake lag. To correct this condition on a long-wheel-base vehicle, a relay valve is ...
An overrun brake (called a surge brake when invented) is a brake system commonly used on small trailers, where the motion of the trailer with respect to the towing vehicle is used to actuate the brake. The early systems were fitted with a spring system which was not very effective.
The brakes are applied when the engineer moves the automatic brake handle to a "service" position, which causes a reduction in brake pipe pressure. During normal service, the pressure in the brake pipe is never reduced to zero and in fact, the smallest reduction that will cause a satisfactory brake response is used to conserve brake pipe pressure.
SUA resolutions include applying the brakes or clutch, or shifting into neutral with an automatic transmission. [ 72 ] [ 73 ] [ 3 ] In most cars, fully applied brakes are easily capable of stopping the car while the accelerator pedal is also fully applied. [ 17 ] "
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