According to the FMVSS 121 law, the secondary tank:

1. Must be isolated from the supply tank

2. Must be color coded

3. Must have a specific volume capacity

4. All the above

5. Both A and C

One-way check valves:

1. Allow air flow in one direction

2. Protect the secondary tank from a failure in the supply tank

3. Are required by FMVSS 121 law

4. All the above

Manual drain valves:

1. Are required by FMVSS 121 law

2. Permit release of condensation from the tank

3. Permit release of condensation from the tank, in order to protect the air system requirements

4. All the above

How does the driver know how much air pressure is in the secondary reservoir?

1. A low air warning switch

2. A manual drain valve

3. A pressure gauge

4. None of the above

What's the purpose of the dual foot control valve?

1. For backup control

2. To separate the secondary and primary circuits

3. To modulate the front service brakes

4. Both B and C

A two-way check valve:

1. Is like a tee with a check ball

2. Is the same as a one way check valve

3. Seeks out dominant air pressures

4. All the above

5. Both A and C

What's the function of a quick release valve?

1. Speeds up application time

2. Slows down the front brakes

3. Speeds up the release of the front brakes

The brake adjuster:

1. Speeds up the release of the front brakes

2. Changes linear force into rotary torque

3. Provides a means of adjusting the brakes

4. Both B and C

A quick release valve is:

1. Like a pipe tee with exhaust port

2. May have hold off capabilities

3. Is not used in the service brake system

4. Both A and B