This provides a fail-safe feature in the event all air is lost; the vehicle still can be parked and can be used as part of an emergency brake system. The tractor protection valve maintains air ...

If you haven't heard of Jake breaks, you're probably not alone. But how is this variation any different from the regular kind ...

Maybe there should be little surprise that truck drivers often overlook brake ... The air dryer bodies can pit and form leaks, he says, adding that related ports and pressure protection valves ...

Continue to fan off the air pressure by stepping on and off the brake pedal to reduce tank pressure. The tractor protection valve and parking brake valve should close (pop out) on a tractor ...