Air Brakes - Massachusetts Cdl

1 . What does the air compressor governor do?

Controls when the air compressor pumps air into the air storage tanks. Controls how quickly air leaves the air storage tanks. Controls the temperature of the air entering the air storage tanks. Controls the temperature of the air leaving the air storage tanks. Click Here Full Cheat Sheet

2 . Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

10 psi 25 psi 50 psi 100 psi Take a FREE Practice Test Now

3 . Air tank drains:

Should not be used in cold weather. Are helpful to remove water and oil from the air tanks. Are used to move air to the brakes. Clean the air in the passenger compartment. Take a FREE Practice Test Now

4 . A tank endorsement is:

Only required when transporting gases. Only required when transporting liquids. Used when transporting both liquids and gases. Optional when transporting hazardous materials. Take a FREE Practice Test Now

5 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster. Axle. Brake drum. Alcohol evaporator. Click Here Full Cheat Sheet

6 . Braking mechanisms are located ____ a brake drum.

Outside Inside Next to On top of Take a FREE Practice Test Now

7 . Which type of brakes do most heavy-duty vehicles have?

Air brakes Solid brakes Liquid brakes Gravity brakes Take a FREE Practice Test Now

8 . If the brake pads rub against the brake drums and create too much heat:

The brakes will stick. The brakes will become extra sensitive. The brakes may stop working. The air compressor will kick on to cool the brakes. Take a FREE Practice Test Now

9 . The parking brake should be:

Used whenever you park your vehicle. Used while driving. Set when driving in bad weather. Removed. Click Here Full Cheat Sheet

10 . Air tanks usually hold enough compressed air:

For one stop before needing to be refilled. For several stops before needing to be refilled. For a day’s worth of braking. For an unlimited number of stops. Take a FREE Practice Test Now

11 . The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge Air compressor governor Supply pressure gauge Drum brake Take a FREE Practice Test Now

12 . Test the low pressure warning signal:

Once a month. Once a week. Twice a week. Before every trip. Take a FREE Practice Test Now

13 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly. Air braking systems are very effective. Air brakes are complicated. Air is free. Click Here Full Cheat Sheet

Study tip: Reduce your study time from hours to minutes with a DMV exam “Cheat Sheet” 99.2% of people who use the cheat sheet pass the FIRST TIME Click Here Full Cheat Sheet

14 . Air tank drains:

Allow rain water to enter the tanks. Are used to drain water and oil from the air tanks. Should never be opened. Must remain open while driving. Take a FREE Practice Test Now

15 . Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.

25 psi 50 psi 75 psi 100 psi Take a FREE Practice Test Now

16 . When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop. Stop in a way that keeps your vehicle in a straight line. Stop in a way that turns your vehicle. Expect your vehicle to slow down more quickly than usual. Take a FREE Practice Test Now

17 . Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:

Air pressure falls below 45 psi. Air pressure falls below 20 psi. Driving downhill. Driving uphill. Click Here Full Cheat Sheet

18 . During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

1 psi 2 psi 3 psi 4 psi Take a FREE Practice Test Now

19 . Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS). Bluetooth. GPS. A rear back-up camera. Take a FREE Practice Test Now

20 . All air tanks must include:

A drain valve. A lock. A trap door. A warning sticker. Take a FREE Practice Test Now

21 . An air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately ____ to come to a complete stop.

100 feet 250 feet 300 feet 450 feet Click Here Full Cheat Sheet

22 . You should not use the parking brake:

If your vehicle is stopped on a level surface. If your vehicle is stopped on a slight incline. If your vehicle's brakes are very hot. If your vehicle's other braking systems seem to be working adequately. Take a FREE Practice Test Now

23 . The air pressure in a dual air brake system should build from 85 to 100 psi within:

Two minutes. 15 seconds. 10 minutes. 45 seconds. Take a FREE Practice Test Now

24 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi. When tank pressure falls below 60 psi. When tank pressure falls below 10 psi. When tank pressure falls below 5 psi. Take a FREE Practice Test Now

25 . Brake fading is caused when:

Brakes are not used often enough. Brakes overheat. Brakes are too cold. Brakes are wet. Click Here Full Cheat Sheet