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Q: Semi trailers made before 1975 that are equipped with air brakes?
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When a driver depresses the brake pedal what air brake system is he using?

If the vehicle has brakes on the steer axle (which any truck from 1975 and newer will have), they're using both the primary and secondary system - primary for the drive axle and trailer brakes, secondary for the steer axle brakes, and often for any additional lift axle brakes, as well.


Is a catalytic converter required on engine manufactured before 1975?

No.


Do all vehicle's with air brakes must have a low air pressure warning signal?

Anything from the 1975 model year and newer, yes. That's when FMVSS121 was implemented.


All vehicles with air brakes must have a low air pressure warning signal?

Anything from the 1975 model year and newer, yes. That's when FMVSS121 was implemented.


Must all vehicles with air brakes have a low air pressure warning signal?

Anything from the 1975 model year and newer, yes. That's when FMVSS121 was implemented.