How to Bleed Car Brakes?
2 Answers
Bleeding air from car brakes involves the following steps: 1. First, locate the bleeder screw on the brake caliper and remove the dust cap from the bleeder valve. Then, connect a rubber tube between the bleeder valve and a brake fluid container. 2. This step requires two people to cooperate. One person sits inside the car and pumps the brake pedal 4-5 times, then firmly holds the pedal down. Meanwhile, the other person loosens the bleeder screw on the brake caliper, allowing air to escape along with the brake fluid. 3. Repeat the above steps until only brake fluid flows out without any air bubbles, indicating that all air has been purged from the brake lines. 4. Finally, tighten the bleeder screw to complete the brake bleeding process.
The exhaust brake system sounds complicated, but it's actually not difficult. I often do it myself, just like when I repaired the old car last time. Prepare wrenches, the appropriate exhaust pipe or kit, and fresh brake fluid. Make sure the garage is well-ventilated and clean around the wheel hubs. Start with the right rear wheel because air tends to accumulate there. Connect the exhaust pipe to the bleed valve and tighten it. Find an assistant to slowly press the brake pedal while you slowly open the valve to let the fluid flow out. When no bubbles appear, quickly close the valve and release the brake. Repeat this process several times until the fluid coming out is clear and bubble-free. Then move sequentially to the left rear wheel, right front wheel, and left front wheel, step by step. Throughout the process, always check the brake fluid reservoir to ensure the level doesn't get too low, or air will enter. When adding new fluid, don't overfill it to prevent spills. After bleeding the brakes, test whether the brakes are responsive and powerful, with no abnormal sounds. Don't rush to hit the road; first, take a slow test drive to ensure safety. Remember to regularly check the fluid for aging and replace it promptly to prevent issues.
