Truck Tractor Air Brake

Question 0

caution must be exercised when working around spring break equipped vehicles because

Answer 0

Spring breaks contain large powerful springs

Question 1

Spring brake Chambers apply and hold a parking brake application

Answer 1

Without air pressure

Question 2

Air supply for parking emergency brake operation flows through a double check valve so that the emergency brakes will

Answer 2

Not apply if either service reservoir air pressure is lost

Question 3

The function of the park control valve is to provide manual

Answer 3

And automatic control of all the parking/emergency brakes on the unit

Question 4

A quick release valve is often used in parking/emergency brake circuits to provide quick

Answer 4

Application of the spring breaks

Question 5

An anti-compounding double check valve is often used in parking/emergency brake circuits to

Answer 5

Release the parking/emergency brakes when the service brakes are applied

Question 6

some truck/tractor units are equipped with a spring break valve that

Answer 6

Allows the spring breaks to modulate application if primary service reservoir air pressure is lost

Question 7

A relay valve used in parking/emergency brake circuits that use spring break valves to ensure that the spring breaks

Answer 7

Apply and released quickly

Question 8

The purpose of the trailer supply line is to transmit air pressure

Answer 8

To charge the trailer reservoirs

Question 9

The purpose of the trailer service line is to transmit air pressure

Answer 9

To apply and release trailer service brakes

Question 10

The purpose of the trailer brake control valve is to allow the operator to

Answer 10

Independently control trailer service brakes

Question 11

Tractors equipped with the bobtail proportioning relay valve will reduce

Answer 11

Primary application pressure when the tractor is not towing a trailer

Question 12

The brake light switch is a normally

Answer 12

Open switch that is closed by primary or secondary service pressure

Question 13

Spring brakes are _____ applied, and _____ released

Answer 13

Spring

Air

Question 14

The purpose of a quick release in the spring brake circuit valve is?

Answer 14

To apply spring brakes quicker

Question 15

The purpose of park control valve is to?

Answer 15

Direct airflow to and from the spring brake chambers

Question 16

What is the purpose of a anti-compounding double check valve?

Answer 16

To prevent the brakes from being applied when the spring brakes are applied

Question 17

What is purpose of tractor protection valve?

Answer 17

To prevent air from being sent out trailer service line in the event that the supply line has become disconnected

Question 18

The trailer service line draw air from where?

Answer 18

Which ever of following has highest pressure being applied:

1. Primary side of treadle valve
2. Secondary side of treadle valve
3. Trailer hand valve

Question 19

What are two ways to check for properly adjusted brakes?

Answer 19

Applied push-rod/slack angle between 90-95 degrees

Push rod stroke has to be less the max set by manufacturer

Question 20

The purpose of trailer hand control valve is to allow?

Answer 20

Operator to independently control trailer service brakes

Question 21

The brake light switch is normally in what position?

Answer 21

Open

It is closed by primary or secondary service pressure