How to Bleed Air from Car Brakes?
3 Answers
Car brake air bleeding method is: 1. Locate the bleeder screw on the brake caliper and remove the dust cap from the bleeder valve; 2. Connect the bleeder port to a drain bottle using a rubber tube; 3. Press the brake pedal and loosen the bleeder screw on the brake caliper, repeating the operation as needed. The brake is positioned below the driver's seat and the console. Braking, also known as deceleration, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other transport tools, or machinery. The working principle of brakes is: fixing a wheel or disc on the machine's high-speed shaft and installing corresponding brake pads, bands, or discs on the machine base to generate braking torque under external force.
You can bleed the brakes at home by yourself, but it requires two people to cooperate. Prepare a transparent bottle and a hose, first fill the brake fluid reservoir to the appropriate level. One person sits in the driver's seat to press the brake pedal, stopping halfway; the other person locates the bleeder valve near the wheel's brake caliper, loosens it half a turn with a wrench, and connects the hose. At this point, the person pressing the brake should slowly push it all the way down, and you'll see old fluid and bubbles flow into the bottle through the hose. Then tighten the bleeder valve, and the person pressing the brake repeats the action, doing this seven or eight times in a row until there are no bubbles left in the hose. Remember to follow the sequence: start with the right rear wheel, then the left rear, followed by the right front and left front wheels. Throughout the process, regularly check that the reservoir doesn't go below the minimum mark, and top it up with new brake fluid of the same type if needed. After bleeding each tire, remember to rinse the oil stains at the bleeder port with clean water.
I just saw the technician bleeding the brake system at the repair shop, and the operation was like this: teamwork is crucial. The technician first removed the wheel for easier access and fitted a special brake bleeding tool onto the caliper's bleed nipple. The person in the driver's seat lightly pressed the brake pedal, and the bleeding tool automatically sucked out the air. When a stream of large bubbles appeared in the transparent tube, you could see the air being expelled. The key point is to continuously top up with fresh brake fluid; when the reservoir level drops to the minimum mark, it's time to add more, ensuring the brake lines are always full. The technician mentioned that many people forget to bleed all four wheels properly, but the front wheels actually use the most brake fluid and require thorough bleeding. After completing the job, he also used a pressure tester to ensure there were no leaks in the brake hoses, which is quite difficult to achieve at home. The whole process took about half an hour and used up half a liter of brake fluid.
