09-11-2013, 07:05 PM
Tom they call it the DOT valve because its required by the DOT as a last chance in the event of air failure.
If you were driving a big rig truck with a trailer. The trailer would also have one. The proportional valves serve a different purpose.
If you were driving a big rig truck with a trailer. The trailer would also have one. The proportional valves serve a different purpose.
Jimmy