Sometimes referred to as Brake Fluid Change, Change Brake Fluid, Replace Brake Fluid, Brake Fluid, Brake Fluid Replacement, Brake Fluid Replace

Brake fluid replacement is a brake bleeding procedure. The modern method uses an appliance known as a brake bleeder. The brake bleeder introduces fresh brake fluid—under pressure—to the brake fluid reservoir.

The brake bleeder screws (located at each brake caliper) are manually opened in succession, allowing fresh fluid to flow through that branch. The screws are opened in the following order: left rear, right rear, right front, left front until all four are filled with fresh brake fluid. This process not only fills the reservoir with fresh brake fluid, but also naturally purges and displaces any trapped air, thus "bleeding" the brakes.

In most modern vehicles, the brake fluid level is monitored via a sensor in the brake fluid reservoir. Changes in the brake fluid level are displayed on the instrument panel as an indicator of normal brake wear. As the brake pads or brake shoes wear, the brake fluid level will correspondingly drop from maximum to minimum levels. When the brake fluid level nears minimum—and the low fluid display activates—the brakes should be inspected for wear before adding brake fluid. If the brakes are not worn and the fluid level is low, there may be a leak. Inspect and repair accordingly.

Brake fluid will damage a vehicle's paint, so avoid contact with the surface of the car.

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