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6 Cards in this Set

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What is a dual air brake system?

A dual air brake system has two separate air brake systems, which use a single set of brake controls.

What are slack adjusters?

Slack adjuster is part of an air brake system that is used to adjust The breaks when needed

How can you check slack adjusters?

Check slack adjusters on s-cam breaks. Park on level ground and chock the wheels to prevent the vehicle for moving. Release the parking break so you can move the slack adjusters. Use gloves and pull hard on each slack adjuster that you can reach. If the slack adjuster moves more than about 1 inch where the pushrod attaches to it, it probably needs adjustment.

How can you test the low pressure warning signal?

Shut the engine off when you have enough air pressure so that the low pressure warning signal is not on. Turn the electrical power on and step on and off the brake pedal to reduce air tank pressure. The low air pressure warning signal must come on before the pressure drops to less than 60 PSI in the air tanks.

How can you check that the spring breaks come on automatically?

Step on and off the brake pedal to reduce tank pressure. This will drop the pressure from 20 to 45 PSI which will cause the spring breaks to come on.

What are the maximum leakage rate?

The loss rate should be less than 2 PSI in one minute for single vehicles and less than 3 PSI in one minute for combination vehicles.