4 reasons why car brakes don't work when you press the brake pedal

1.Lack of brake fluid

Obviously, when the brake pads wear, the fluid in the master cylinder reservoir will drop. But if the pads are good but low on fluid, it means there is a leak somewhere in the system. The joints or the areas connecting the fixed and moving parts of the oil line are often the most vulnerable.

Also check for leaks at the rear of the master cylinder. If oil is present in the seal, the master cylinder needs to be replaced, but first check and repair leaks in the pipes.

2. Master cylinder too much oil

This phenomenon is due to a loose seal. When the driver steps on the brake, the oil in front of the piston will flow through the gap and return to the return oil line, thus not creating oil pressure, leading to the brake not working.

To fix this problem you need to take your car to the garage for inspection and repair.

3. Loose wheel axle

The bearings hold the wheel in place as it rotates. If they fail, they cause the brake disc or drum to move. As the wheel rotates, they force the brake pads (brake shoes) inward. When you apply the brake, even though the brake pedal touches the floor, the amount of fluid still does not fill the gap in the brake mechanism.

In this situation, you can pedal continuously 2 or 3 times, the system will be compensated with oil and return to normal operation.

4. Air entering the oil line

A faulty brake caliper or wheel cylinder can allow air into the lines when the driver releases the brake pedal (the brake pedal returns). The oil pressure is eliminated by the air bubbles, leading to brake failure. The system needs to be bled, but the leak must be repaired first to avoid future problems.