If your chambers are still single, you should have a knowledgeable shop or mechanic install spring brakes on your rig. Don’t try it if you’re not already confident in your competence to do this job.
In emergency stops it’s crucial to keep the vehicle in a straight line.
The trailer hand valve controls the trailer brakes, but never use it when driving. It’s dangerous and rather unnecessary, since the foot brake sufficient because it sends the air to all brakes.
If you want your vehicle to be firmly hold while parked on grade you need to have properly installed the correct brake chamber.
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