How Is the Relay (Secondary)section of an FMVSS-121 Compliant Dual-Circuit

question 16

Multiple Choice

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

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