Pinpoint Test G: Brake Drag: Notes

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions

The brake pedal is connected to the power brake booster, which is connected to the brake master cylinder. When the brake pedal is pressed, brake fluid is pushed through the double-walled steel tubes and flexible hoses to the front and rear disc brake calipers. The brake fluid enters the disc brake calipers, forcing the caliper pistons and brake pads outward against the brake disc friction surface, slowing or stopping rotation. When the brake pedal is released, brake fluid pressure is relieved, returning the front and rear disc brake caliper pistons and brake pads to the unapplied position. The vehicle will experience dragging if the brake fluid pressure is not relieved or the brake pads do not return to the unapplied condition. This condition indicates there is a concern with the brake system.

Possible Sources

Parking brake component
Brake caliper and/or guide pins
Brake flexible hose
ABS/ HCU