B.C. Class 1 Knowledge Practice Test 2026：第4套练习测试

B.C. Class 1 Knowledge Practice Test 练习测试第4套（共5套）：再练25道题，附答案和解释。

商用车辆
不列颠哥伦比亚省
130道题
核对于2026年10月10日

第1题，共25题
In this air brake diagram, what is the job of the air compressor?
- To remove water from the tanks
- To pump air into the storage tanks
- To measure push rod stroke
- To apply the parking brake
显示答案
答案: B. To pump air into the storage tanks
The engine-driven compressor pumps air into the tanks.
第2题，共25题
Since April 1, 2000, which trailers must have anti-lock brakes in Canada?
- Only trailers under 1,000 kg
- No trailers; only the tractor needs it
- Only boat and recreational trailers
- Commercial trailers with air brakes
显示答案
答案: D. Commercial trailers with air brakes
ABS is mandatory on commercial trailers with air brakes, and on trucks and buses over 4,560 kg built since April 1, 2000.
第3题，共25题
Why do you check for air leaks with the brakes applied?
- Leaks drain air quickly just when you need the brakes
- To test that the horn works on air
- To warm up the engine before driving
- To check the tire pressure on each wheel
显示答案
答案: A. Leaks drain air quickly just when you need the brakes
Leaks reduce the air available for braking, and they get worse when the system is under pressure.
第4题，共25题
Why are spring brakes used for parking?
- They are the only brakes fitted to the trailer
- They hold mechanically, without needing air in the system
- They are stronger only while the engine runs
- They use less fuel than the service brakes
显示答案
答案: B. They hold mechanically, without needing air in the system
Service brakes rely on air pressure, which can leak away. Spring brakes hold with spring force.
第5题，共25题
Before you drive, the air gauge shows low pressure. What should you do?
- Drive off and let it build while moving
- Drain the tanks and start again
- Let the pressure build to normal before moving
- Release the spring brakes by hand
显示答案
答案: C. Let the pressure build to normal before moving
Do not move until the air pressure has built up and the low air warning has gone off.
第6题，共25题
Why does air brake lag matter for following distance?
- It adds distance before the brakes work, so you need a bigger gap
- It only matters when the vehicle is parked
- It lets you follow more closely than a car
- It makes the brakes work instantly, so gaps can be small
显示答案
答案: A. It adds distance before the brakes work, so you need a bigger gap
Lag time is added to perception and reaction time, so the truck travels further before braking starts.
第7题，共25题
What does too much push rod stroke mean?
- The brake is working perfectly
- The governor is set too low
- The brake is out of adjustment
- The tank is too full
显示答案
答案: C. The brake is out of adjustment
Excess push rod travel means the brake is out of adjustment and will not give full braking force.
第8题，共25题
What does the parking brake control knob usually look like?
- A green toggle switch
- A blue, square lever
- A yellow, diamond-shaped push-pull knob
- A red, round push button
显示答案
答案: C. A yellow, diamond-shaped push-pull knob
The parking (spring) brake control is a yellow, diamond-shaped push-pull knob.
第9题，共25题
During an air brake check, what should happen when you reduce the air pressure by fanning the brakes?
- The engine should stop when pressure falls
- The spring brakes should apply before the warning comes on
- The low air warning should come on before the spring brakes apply
- Nothing should happen until the tanks are empty
显示答案
答案: C. The low air warning should come on before the spring brakes apply
The warning must activate before pressure falls low enough for the spring brakes to apply.
第10题，共25题
Why should you avoid fanning (pumping) air brakes?
- It wastes air and lowers the pressure in the system
- It drains fuel from the tank
- It makes the brakes far too strong
- It overheats the engine and compressor
显示答案
答案: A. It wastes air and lowers the pressure in the system
Each pump uses air. Fanning the brakes can drop pressure quickly.
第11题，共25题
A truck has 16 brakes and one is out of adjustment. What happens?
- The truck stops faster than before
- The air compressor stops pumping
- Nothing; one brake out of 16 does not matter
- The other brakes must do more of the work
显示答案
答案: D. The other brakes must do more of the work
Each brake is designed to do its share. If one is out of adjustment, the others work harder and may overheat.
第12题，共25题
Why must water be drained from air tanks?
- Water can freeze and block valves and lines
- Water makes the brakes stronger
- Water cools the engine
- Water is needed for the brakes to work
显示答案
答案: A. Water can freeze and block valves and lines
Water and oil collect in the tanks. In cold weather, water can freeze and stop the system working.
第13题，共25题
About how much time does air brake lag add before the brakes begin to apply?
- About four-tenths of a second
- About 4 seconds
- About 1 full minute
- No time at all
显示答案
答案: A. About four-tenths of a second
Air brake lag time is about 4/10 of a second.
第14题，共25题
For how long is a passed air brake knowledge test result valid in B.C.?
- For life
- Five years
- One year
- One month
显示答案
答案: C. One year
The air brake knowledge test result is valid for one year.
第15题，共25题
What should you check on the compressor during the air brake inspection?
- The colour and make of the compressor
- That a belt-driven compressor's belt is in good shape and tight
- The fuel level inside the compressor
- The compressor's radio and wiring connection
显示答案
答案: B. That a belt-driven compressor's belt is in good shape and tight
A loose or worn belt can stop the compressor from building air.
第16题，共25题
Where do you apply to take the air brake knowledge test in B.C.?
- At your trucking company
- At a police station
- At a driver licensing office
- At a weigh scale
显示答案
答案: C. At a driver licensing office
Apply at a driver licensing office with your ID and pay the knowledge test fee.
第17题，共25题
How is brake adjustment checked on S-cam brakes?
- By listening to the brakes while driving slowly
- By checking the tire pressure on each axle
- By measuring push rod stroke with the brakes fully applied
- By feeling how hot each drum is after a trip
显示答案
答案: C. By measuring push rod stroke with the brakes fully applied
Measure how far the push rod moves on a full application. Too much stroke means the brake is out of adjustment.
第18题，共25题
Is a road test required for the air brake endorsement in B.C.?
- Yes, in a tractor-trailer
- No
- Yes, but only at night
- Yes, in a bus
显示答案
答案: B. No
The air brake endorsement needs a knowledge test and a pre-trip inspection test, but no road test.
第19题，共25题
When air enters a brake chamber, what moves?
- A diaphragm pushes the push rod out
- The brake drum starts to spin faster
- The governor cuts out the compressor
- The tank drain valve opens
显示答案
答案: A. A diaphragm pushes the push rod out
Air pressure pushes the diaphragm, which pushes the rod that turns the slack adjuster.
第20题，共25题
How does a retarder help the air brakes?
- It adds extra air to the tanks while you drive
- It makes the service brakes apply faster
- It adjusts the slack adjusters automatically
- It slows you without the service brakes, so they stay cool
显示答案
答案: D. It slows you without the service brakes, so they stay cool
Retarders such as engine and exhaust brakes reduce the work, heat and wear on the service brakes.
第21题，共25题
What is the possible fine for brakes that are not correctly adjusted?
- Up to $20
- Up to $100
- Up to $2,000
- No fine, only a warning
显示答案
答案: C. Up to $2,000
Brakes not adjusted or not performing properly can bring a fine of up to $2,000.
第22题，共25题
Which part senses tank pressure and controls the compressor?
- The slack adjuster
- The governor
- The brake chamber
- The brake drum
显示答案
答案: B. The governor
The governor tells the compressor when to stop (cut out) and start (cut in) pumping.
第23题，共25题
On a Class 1 road test in a vehicle with air brakes, which inspection is included?
- A full engine inspection
- A tire change on the trailer
- An air brake pre-trip inspection
- A fuel economy check
显示答案
答案: C. An air brake pre-trip inspection
Road tests include an air brake pre-trip inspection when the vehicle has air brakes.
第24题，共25题
What connects the push rod to the brake camshaft?
- The gladhand
- The foot valve
- The slack adjuster
- The governor
显示答案
答案: C. The slack adjuster
The slack adjuster links the push rod to the camshaft and adds leverage.
第25题，共25题
What temperature should brake parts not go above?
- About 900 °C
- About 60 °C
- About 250 °C
- About 120 °C
显示答案
答案: C. About 250 °C
Brake parts reach about 120 °C in normal stops and should not exceed about 250 °C.

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