Spring brakes are?

Spring brakes are?

• A. A type of brake that uses airbags
• B. Hydraulic brakes activated by air pressure
• C. Powerful springs that are held back by air pressure. If the air pressure is removed, the springs put on the brakes. Typically if the psi drops too low
• D. A type of disc brake used on tractors

Answer: (C)

Spring brakes use strong springs to apply the brakes when air pressure that normally holds them back is removed. In normal operation, air pressure keeps the springs compressed and the brakes released. If the air pressure drops too low or is lost, the springs are released and push the brakes on, providing a fail-safe way to stop the vehicle. This system acts as the parking brake and emergency brake on heavy trucks and tractors. It’s not an airbag system, not a hydraulic brake, and not a disc brake type.

Spring brakes use strong springs to apply the brakes when air pressure that normally holds them back is removed. In normal operation, air pressure keeps the springs compressed and the brakes released. If the air pressure drops too low or is lost, the springs are released and push the brakes on, providing a fail-safe way to stop the vehicle. This system acts as the parking brake and emergency brake on heavy trucks and tractors. It’s not an airbag system, not a hydraulic brake, and not a disc brake type.