In a hydraulic brake system, air is removed from the system at the ______

In a hydraulic brake system, air is removed from the system at the ______

• A. Reservoir
• B. Master Cylinder
• C. Check Valve
• D. Bleeder Screws

Answer: (D)

Air in the brake lines makes the pedal feel soft because air compresses easier than brake fluid. To remove that trapped air, you bleed the system at the points where air collects—the bleeder screws on the brake calipers or wheel cylinders. Opening a bleeder lets air (and some fluid) escape, and as you continue bleeding, brake fluid from the reservoir replaces what’s lost, pushing more air out until only fluid is expelled. The reservoir is just a fluid supply, and the master cylinder, while part of the hydraulic path, isn’t where you vent air in normal operation. The check valve controls flow but isn’t a vent point for air removal. Therefore, the device designed to purge air from the lines is the bleeder screws.

Air in the brake lines makes the pedal feel soft because air compresses easier than brake fluid. To remove that trapped air, you bleed the system at the points where air collects—the bleeder screws on the brake calipers or wheel cylinders. Opening a bleeder lets air (and some fluid) escape, and as you continue bleeding, brake fluid from the reservoir replaces what’s lost, pushing more air out until only fluid is expelled. The reservoir is just a fluid supply, and the master cylinder, while part of the hydraulic path, isn’t where you vent air in normal operation. The check valve controls flow but isn’t a vent point for air removal. Therefore, the device designed to purge air from the lines is the bleeder screws.