The brake pedal stroke is too large and the causes of brake failure are summarized.

【Car owner’s home car knowledge】The car brake pedal stroke is too large, the braking effect is slow, the braking efficiency is very low or even lost, and the braking distance is increased.

Cause of failure:

1.Insufficient brake oil pressure. (The brake master cylinder is short of oil, the brake pipe is broken, the oil pipe joint is leaking, and the oil line is blocked);

2.There is air in the braking system;

3.The free travel of the brake pedal or the brake clearance is too large, the brake shoe friction plate has poor contact, is severely worn or has oil stains;

4.The brake master cylinder, wheel cylinder piston and cylinder tube are worn or strained, and the leather cup is aged and damaged.

Troubleshooting:

1.Continuously press the brake pedal. If the pedal gradually rises and feels elastic, but is still very low when you press the pedal again after stopping for a while, it means there is air in the brake system. At this time, the brake system should be vented.

2.The brake does not work with one foot, but the braking effect is good when the pedal is pressed several times in succession. Generally, the free travel of the brake pedal is too large or the brake gap is too large. The pedal free travel should be adjusted, then the brake clearance should be checked, and the brake should be disassembled and repaired if necessary.

3.When you step on the brake pedal, it is not soft or heavy, but the braking effect is poor. This phenomenon is a wheel brake failure, such as oil in the brake shoe or poor contact, aging and wear of the friction plate, and uneven wear of the brake drum. The technical condition of the brakes should be checked and adjusted and repaired if necessary.

Related recommended reading:
Detailed explanation of common car body noise repair methods
http://news.16888.com/a/2013/1015/282959.html