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How to Bleed Air from Brakes?

2 Answers

VonAvery

07/24/25 5:37pm

Methods for bleeding air from brakes: 1. To bleed the brakes of a car, two people are required. One person sits in the driver's seat and presses the brake pedal to generate brake pressure. The other person works underneath the car to perform the bleeding. 2. The person pressing the brake pedal in the driver's seat must firmly press the pedal down and keep it depressed without releasing until the person underneath the car completes the bleeding process. 3. Bleeding procedure. The person underneath the car waits for the brake pedal to be fully depressed, then uses a wrench to open the bleeder valve on the brake caliper to release air. After bleeding, tighten the bleeder valve, lift the brake pedal, and press it down again. Repeat this process until no air bubbles are visible in the brake fluid coming out of the bleeder valve. 4. Precautions: If a problem occurs with the brake caliper of one wheel or a new brake caliper is installed, bleed only that wheel's brakes. If the brake pedal still feels soft after bleeding, proceed to bleed the other wheels' brake calipers. Always check and replenish the brake fluid during the bleeding process.

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LeSamuel

08/11/25 9:43am

Having run an auto repair shop for over a decade, I can tell you that brake bleeding must follow proper procedures. A two-person operation is most reliable—one sits in the driver's seat to pump the brake pedal while the other works underneath to operate the bleeder screw. First, ensure the brake fluid reservoir is filled to the MAX line. Then attach a clear hose to the bleeder valve and run it into an empty bottle. The person pumping should slowly press the pedal fully on command and hold it steady; meanwhile, the person below opens the bleeder screw to let contaminated fluid and air bubbles drain out before tightening it again, then releasing the pedal. Repeat this process over a dozen times per wheel until no bubbles emerge in the hose. Continuously top up with fresh brake fluid during the process to prevent air ingress. Finally, test for firm pedal feel to confirm safety. DIY attempts often skip critical steps—beginners should seek professional service.

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