Why is the car brake pedal low?
(Baonghean.vn) - The car brake pedal is lowered, with a lower height than standard, which is one of the problems that many car owners encounter. Why does this happen?... Below are some of the causes of the brake pedal being "low" and ways to maintain the car brakes as soon as possible.
1. Lack of brake fluid
 |
Lack of brake fluid is one of the main causes of low brake fluid. Especially when the pads are good but the fluid runs out quickly, it means that the brake system is leaking. You should check at the joints such as the connector or the area connecting the fixed and mobile parts, which are the most susceptible to leaks.
In addition, the lack of brake fluid can also be caused by a leak in the cylinder head. Therefore, it is necessary to check if there is oil in the cylinder head. If there is, the cylinder needs to be replaced.
Note, when adding new brake fluid, wipe the bottle mouth clean to avoid foreign objects falling inside, causing negative effects on the brake system and pedal.
2. Brake disc and drum are warped
 |
An important condition for the brake to be activated when the brake pedal is applied is that the wheel bearing must be in the correct rotating position. If the shaft is misaligned, it will cause the brake disc and drum to rotate, resulting in the brake pads slipping inwards when the wheel rotates... At this time, even if the driver presses the brake pedal to the floor, the brake fluid will not create enough pressure to compensate and activate the friction force on the brake pads.
To quickly handle this situation, the driver needs to continuously pump the pedal several times so that the system can push the oil into the gap and activate friction.
3. Air entering the brake fluid line
 |
Another cause of a low brake pedal is air in the line. When air enters the brake line as you step on the brake pedal, the line becomes clogged with air, preventing the oil from moving through the line; this must be bled to fix the problem.
Note, you should pay close attention to the order of air release; first the wheel farthest from the main cylinder, then the wheels closest to the cylinder; starting from the rear wheel, then the front wheel. The wheels are usually designed to make it easy for the user to carry out the air release process, there will be a air release screw on the rear wheel and the same with the front wheel.
Once the air has been released, the brake pedal will stiffen. Take the car for a test drive to re-evaluate whether the brake pedal height is okay, in order to have the best measures to raise or lower the brake pedal.
