Poor air brake systems and equally poor maintenance lead to brake imbalance.

1. True

2. False

Brake imbalance may contribute to:

1. Flat spotted tires

2. Uneven brake wear

3. Accidents

4. All of the above

5. None of the above

The need for safer and more efficient trailer brake systems has been apparent because

1. The nation's highways are in worse shape than in the past

2. Rigs have grown longer, travel faster and pull heavier loads.

3. The government said so

4. None of the above

The government established what to address concerns for safer, more efficient brake systems

1. TMC

2. FMVSS 121

3. Brake inspector certification rules

4. None of the above

Over the years there have been many different types of brake systems that evolved because of changes in the "121" law.

1. True

2. False

Trailer brake systems have evolved full circle starting with the multi-tank systems.

1. True

2. False