To change brake fluid, follow these general steps for a safe and effective brake fluid replacement:
- Prepare the Vehicle and Materials
- Gather brake fluid (check your vehicle’s manual for the correct type, usually DOT 3 or DOT 4), a container for old fluid, a turkey baster or syringe, rags, a wrench, a clear hose, jack and jack stands, and possibly a helper
- Drain Old Brake Fluid
- Remove the cap from the brake master cylinder reservoir.
- Use a turkey baster or syringe to suck out as much old brake fluid from the reservoir as possible to avoid mixing old and new fluid
- Refill Master Cylinder
- Fill the master cylinder reservoir with fresh brake fluid up to the "FULL" line. Be careful not to let the reservoir run dry during the process to prevent air from entering the brake system
- Bleed the Brakes
- Jack up the vehicle and remove the wheels to access the brake calipers.
- Start with the wheel farthest from the master cylinder (usually the right rear), then move closer (left rear, right front, left front).
- Locate the bleeder valve on each brake caliper or wheel cylinder, attach a clear hose to it, and place the other end into a container.
- Have a helper press the brake pedal while you open the bleeder valve with a wrench to let old fluid and air escape. Close the valve before the helper releases the pedal to prevent air from entering. Repeat until clean fluid flows out
- Top Off Fluid and Repeat
- Keep topping off the master cylinder reservoir after bleeding each wheel to maintain fluid level.
- Continue bleeding all wheels until all old fluid is replaced with clean fluid and no air bubbles are visible
- Clean Up and Dispose of Old Fluid
- Replace the reservoir cap securely.
- Dispose of old brake fluid responsibly, as it is hazardous waste
This process typically takes 30 to 60 minutes for a skilled person and may require a second person to help with pumping the brake pedal
. Using brake fluid with corrosion inhibitors, like Prestone, can help protect your brake system longer
. If you are not confident or lack the proper tools, it is advisable to have a professional mechanic perform the brake fluid change due to the high safety importance of the braking system
