Air Brake Test Reading 2

Question 1

On a dual air brake system gauge, what does it mean when the air pressure for one of the two separate systems drops?

Accepted Answer

Only that one system is affected and the other still works

Answer

Both systems instantly lose all pressure

Answer

The parking brakes release automatically

Answer

The engine shuts off

Question 2

When the low air pressure warning light comes on, at roughly what pressure does it typically activate?

Accepted Answer

Below 60 psi

Answer

Below 100 psi

Answer

Below 120 psi

Answer

Below 150 psi

Question 3

What does the air compressor governor control?

Accepted Answer

When the compressor pumps air into the tanks

Answer

The speed of the truck

Answer

The temperature of the brakes

Answer

The position of the parking brake

Question 4

Reading the manufacturer's plate, what is the purpose of the supply pressure gauge?

Accepted Answer

Shows how much pressure is in the air tanks

Answer

Shows oil level

Answer

Shows coolant temperature

Answer

Shows tire pressure

Question 5

What does an application pressure gauge show the driver?

Accepted Answer

How much air pressure is being applied to the brakes

Answer

Total tank pressure

Answer

The fuel remaining

Answer

The cab temperature

Question 6

When reading brake instructions, increasing application pressure to hold speed on a downgrade is a sign of what?

Accepted Answer

Brakes are fading and losing effectiveness

Answer

Brakes are working perfectly

Answer

The tank is overfilled

Answer

The governor has cut out

Question 7

What does the safety relief valve in the air brake system protect against?

Accepted Answer

Too much pressure

Answer

Too little pressure

Answer

Frozen brake lines

Answer

Worn brake pads