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A1: Engine Repair79 questions
A2: Automatic Transmission/Transaxle70 questions
A3: Manual Drive Train and Axles73 questions
A4: Suspension and Steering69 questions
A5: Brakes66 questions
A6: Electrical/Electronic Systems67 questions
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Date: 19th Aug 2026Time Taken: 00:00:31

A5: Brakes

Answers Result

A vehicle has a return-style electronic fuel injection system with a fuel pressure regulator on the fuel rail. On a cold start, a fuel pressure gauge connected at the rail shows fuel pressure above the specified base (key-on/engine-off) pressure. Which condition is the most likely cause of the fuel pressure being above specification?

Incorrect

A.Fuel pressure regulator stuck closed (not bypassing fuel back to the tank)
B.Restricted fuel filter
C.Weak fuel pump
D.Faulty fuel level sender (in-tank gauge circuit problem)

In most front-wheel-drive vehicles with a dual-circuit hydraulic brake system, which circuit split design is most commonly used to help maintain vehicle control if one hydraulic circuit fails?

Correct

A.Front/rear split circuit
B.Left/right split circuit
C.Diagonal split (X-split) circuit
D.Single-circuit hydraulic system

A customer reports the A/C only blows warm air. With the engine running and the A/C commanded on, the blower operates normally. You verify the A/C fuse and relay are OK and the compressor clutch coil has normal resistance, but the clutch does not engage. What is the next step in diagnosis?

Incorrect

A.Replace the cabin air filter
B.Adjust the heater control valve
C.Replace the compressor with a new one
D.Check system pressure/refrigerant charge (static and/or with manifold gauges)

Answers Result

Incorrect

A.Fuel pressure regulator stuck closed (not bypassing fuel back to the tank)
B.Restricted fuel filter
C.Weak fuel pump
D.Faulty fuel level sender (in-tank gauge circuit problem)

Fuel pressure is controlled by the fuel pressure regulator in a return-style system by bypassing excess fuel back to the tank through the return circuit. If the regulator is stuck closed (or otherwise not allowing bypass), pressure at the rail can rise above the specified base pressure. A restricted fuel filter and a weak fuel pump typically cause low fuel pressure and/or volume, not high pressure. A fuel level sender only affects the fuel gauge reading and does not change rail pressure.

In most front-wheel-drive vehicles with a dual-circuit hydraulic brake system, which circuit split design is most commonly used to help maintain vehicle control if one hydraulic circuit fails?

Correct

A.Front/rear split circuit
B.Left/right split circuit
C.Diagonal split (X-split) circuit
D.Single-circuit hydraulic system

A diagonal split (X-split) circuit pairs one front brake with the opposite rear brake in each hydraulic circuit. If one circuit fails, the vehicle typically still has braking on one front wheel and the opposite rear wheel, which helps maintain steering and directional control compared with losing both front brakes or both rear brakes. A front/rear split can leave the vehicle with only rear brakes (or only front brakes) after a failure, which can reduce stability and stopping effectiveness. A left/right split can cause strong pull to one side if one circuit fails. A single-circuit system does not provide redundancy if a line or circuit fails.

Incorrect

A.Replace the cabin air filter
B.Adjust the heater control valve
C.Replace the compressor with a new one
D.Check system pressure/refrigerant charge (static and/or with manifold gauges)

A compressor clutch may be prevented from engaging when the system refrigerant charge is low because the low-pressure switch (or pressure sensor logic) can open the clutch/relay control circuit to protect the compressor. Checking system pressures/charge is a fast, non-invasive next step that can confirm (or rule out) a low-charge condition. Replacing the compressor is premature without evidence of an internal compressor or clutch failure. Adjusting a heater control valve does not address why the A/C compressor is not being allowed to run. Replacing the cabin air filter can affect airflow volume but will not typically prevent clutch engagement.

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Understand why,not only what.

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How is this different from a prep book?

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Can I study on my phone?

What happens if I don't pass?

Understand why,
not only what.

Before you start,
you probably want to know…