have air brakes, and that sound is made by the safety valves resetting the air pressure after use. True air brakes are ...

Air in the brake system can make your brake pedal feel spongy and vague. You should flush the fluid every two or three years, ...

air can still travel past the threads on the bleeder bolt into the caliper if there's negative pressure in the system while the bleeder screw is cracked open. Top off the brake fluid reservoir ...