So what do you remember from your air brakes class? What information stayed in your mind? Do you remember how to perform the “6 pack?” How do you perform a service leak check? How do you measure push rod travel? These performances and draining the air tanks should take place every day. the number one out of service item is “Brakes out of adjustment.”
Did you know that if tire pressure is less than 50% of the pressure marked on the side of the tire means you will not be allowed to proceed until repaired.
Did you register your air brake course completion certificate on your license at the registry? For you to drive an air brake equipped vehicle you need a “Q” endorsement on your license unless you are accompanied by someone who has a “Q” endorsement.
The easiest way to perform the “6 pack” and leak check is to build your air to max (120 psi) and release the brakes. Step on the brakes to the floor and hold for 4 seconds. Release and repeat. Rebuild the air, step on the brakes for 4 seconds, release and repeat. Rebuild the air, step on the brakes for 4 seconds, release and build the air back up to maximum.
Then place an extendable cane on the brake pedal to jam it to the floor, and block the cane under the steering wheel to hold the brake pedal to the floor. Check your gauges and go for a tour around the truck and trailer. Listen for air leaks. Check the brake lights work, and check the stroke at each brake chamber. This is possible if markers are installed on each pushrod that indicate the length of travel when the service brakes are applied. If pushrods exceed allowable travel, usually 2″ on a drive axle or trailer axle, then a technician should check all the brake components for undue wear, and or adjust the travel.
This is the simplest way to make sure your brakes will stop your vehicle efficiently. Just before you leave the yard, perform the brake responses, roll, then stop with the trailer hand valve, release. Roll the truck again and stop with the park brake valve, release, then roll the truck and stop with the brake pedal. Release and drive on if they are all doing the job. Have a safe trip.