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It doesn't kill your brakes. It just overrides the parking spring brakes. The service brakes still work as they normally would. It's just for in the event that a valve goes bad you can drive the truck rather than having to wait for a wrecker since the driveline brake can act as a parking brake...

The floor mounted parking brake has a linear valve hooked to it. That is the little roller thing with an arm on it that causes the honk from the air vent when you pull the floor brake handle up. The button on the dash is to override the valve on the parking brake handle in the event the one on...

In the event the linear valve that is attached the driveline brake handle fails and does not send air to the rear spring brakes when it's time to gtfo of dodge so you aren't just sitting there with a truck that won't release the rear brakes cause of one bad valve. The linear valve on the handle...