CDL Air Brakes Test

To test air service brakes you should: - Answer- Brake firmly while slowly moving forward The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi - Answer- 60 If your vehicle has an alcohol evaporator, every day during cold weather you should: - Answer- Check and fill the alcohol level All air brakes equipped vehicles have: - Answer- A supply pressure gauge The most common type of foundation brake found on heavy vehicles is the: - Answer- S-cam drum Modern air brakes combine three different systems. They are the service, the parking, and the ___ brakes. - Answer- Emergency To check the free play of manual slack adjusters of s-cam brakes, you should park on: - Answer- Level ground, chock the wheels and release parking breaks Why should you drain water from compressed air tanks? - Answer- Water can freeze in cold weather and cause brake failure The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below____ psi - Answer- 20 With air brake vehicles, the parking brake should be used: - Answer- Whenever you leave the vehicle unattended The safety valve is set automatically when pressure is - Answer- 150 Repeatedly partially increasing and pressing the brake pedal may result in: - Answer- A loss of air brake pressure If your truck has dual air brake system, and one of the systems loses its pressure, what will happen? - Answer- Either the front or rear brakes will not be fully functional If you must make an emergency stop, you should brake so you: - Answer- Can steer and so your vehicle stays in a straight line The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than: - Answer- 3 psi in one minute You brakes are fading w