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How is the relay (secondary) section of an FMVSS-121 compliant dual-circuit foot valve actuated when the air brake circuit is functioning properly?
A) pneumatically
B) mechanically
C) both mechanically and pneumatically
D) by foot pressure alone
Dual-Circuit Foot Valve
A brake valve used in heavy vehicles that controls two separate air brake systems from a single pedal.
FMVSS-121
The Federal Motor Vehicle Safety Standard pertaining to air brake systems, ensuring safe stopping distances and reliability for heavy trucks and buses.
Pneumatically
Operating or moved by air pressure; often refers to tools, systems, or components that use compressed air to function.
- Acknowledge the responsibilities and mechanisms of various valves in the air brake system.
Verified Answer
Learning Objectives
- Acknowledge the responsibilities and mechanisms of various valves in the air brake system.
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