In general, brake lines need to be bled every 2 to 3 years. A spongy or sinking brake pedal can also be caused by a hydraulic problem, like a failing master cylinder, a leaking rear wheel cylinder, a bad caliper or bad ABS. It’s important to rule out these dangerous possibilities via professional inspection before proceeding.
Always consult the owner’s manual before buying brake fluid, since different vehicles need different types. You cannot bleed the brakes yourself on newer vehicles that have an anti-lock brake system (ABS). If your vehicle has ABS, you need a scan tool to electronically bleed the brakes, so take your vehicle to a reputable mechanic.
The master cylinder is usually easy to access—in most vehicles, it’s near the top of the engine.
Brake fluid is corrosive and can eat through the paint on your car. If any spills, clean it up with a rag right away.
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Work your way back toward the driver’s side, going right rear, left rear, right front, left front.
Any plastic bottle will do, such as a water or soda bottle. Just make sure you can throw the bottle away when you’re done, since it will be holding your waste brake fluid.
Remember, brake fluid is corrosive. If any spills throughout this process, clean it up right away.
You’ll also notice the brake fluid turn from dark to clear. This is a good sign, and it means that new brake fluid is being forced through the system.
Once the jacks are out from underneath the car, you can put your hubcaps back on.
Some states and counties may require you to take old brake fluid to a hazardous waste facility, even if you’ve poured it into kitty litter. Check your local laws to make sure.
If your brakes still feel soft and spongy or if you notice any problems after bleeding them, have your car towed to a mechanic shop. There’s a chance they might need to be bled again, or your vehicle has a different brake problem that needs to be fixed.
