制动室

T3030 Service Brake Chambers The service brake chamber is used when only the application of service brake air is required on an axle. There will be no emergency braking provided on this axle. You will find service brake chambers on steer axles, some rear axles, and old trailers that use a relay emergency valve to apply parking air pressure to the service chamber. Spring Brake Piggybacks The spring brake Piggyback is a replacement part for repair of a spring brake chamber. There is a heavy spring inside that applies the mechanical force needed for the parking and emergency brake functions. Service of the piggyback should never be attempted because the large spring inside can be compressed with a force up to 3,000 lbs. Severe injury or death can easily result should the spring be accidentally released.