What to Do When Brakes Have Air but No Oil Leak?
2 Answers
Park the car on a level surface. Use four jack stands to lift the car, remove the hub covers, loosen the lug nuts, and then take off all four tires. The brake fluid reservoir or master cylinder is located under the hood, typically a light-colored container with a black cap on the driver's side. Refill the brake fluid through the filler tube. After filling, securely close the reservoir cap. Bleed the brakes starting from the farthest wheel cylinder (usually the right rear wheel cylinder) and proceed to the nearest one.
This issue is actually quite common. Even if there's no brake fluid leakage, air can seep in through the seal of the reservoir cap or get introduced accidentally during part replacements. I think the best solution is manual bleeding, and you'll need an assistant to help: First, make sure the brake fluid reservoir is filled to the maximum level, then start the engine and have your assistant pump the brake pedal vigorously several times inside the car. Next, use a wrench to loosen the bleed screw on the brake caliper to let air and some fluid escape. Repeat this process several times until the pedal feels firm. Be careful throughout to avoid splashing fluid on yourself or the car paint, as brake fluid is highly corrosive. If you're not familiar with the tools, I recommend not taking the risk and instead driving to a nearby repair shop where they have professional equipment to handle it quickly. Remember, brakes are critical for safety, and delaying repairs might lead to pedal failure during emergency braking, which is extremely dangerous.
