Connecticut CDL Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What method can be used to check for leaks in hydraulic brakes?

Press the brake pedal once and observe movement.

Pump the brake pedal three times and hold it down for five seconds.

The method that involves pumping the brake pedal three times and then holding it down for five seconds is effective for checking for leaks in hydraulic brakes. When you pump the brake pedal, you're building up hydraulic pressure in the system. By holding the pedal down after this, you can assess whether it remains firm or slowly sinks toward the floor. If the pedal sinks, this can indicate a leak somewhere in the hydraulic braking system, as the fluid is likely being lost, causing a drop in pressure and therefore a loss of the pedal's firmness.

This method allows drivers to detect issues with the hydraulic system before they become serious problems, ensuring better safety and performance of the vehicle. Regular maintenance and checks like this are critical for the reliability of hydraulic brakes.

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Check fluid levels regularly without testing the pedal.

Use a pressure gauge on the brake lines.

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