If there are air lines going to it, that rules out the jake brake which is electrically activated. If it looks like a suspended brake pedal, that rules out the foot rest or an air horn pedal. The only things I can think of was a relocation of the brake pedal (i.e. a secondary brake pedal) or, as Richard mentioned, a separate brake pedal for air brakes to a heavy trailer. Do you happen to have air connectors on the rear of your coach for a trailer with air brakes?
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