Master cylinders are an essential part of your car’s braking system, and they typically last the life of the vehicle. Still, they can show signs of wear after 50,000 miles or so. So if you notice any unusual brake performance or your brakes aren’t stopping your car as quickly as usual, chances are it’s time to replace the master cylinder. Here are three warning signs telling you when your master cylinder needs to be replaced.
Leaking Brake Fluid
The brake master cylinder serves as the main valve for hydraulic brake fluid in your car’s braking system. Over time, the rubber seals of the master cylinder can become worn down and allow brake fluid to leak. As a result, your car’s brake system will not maintain sufficient pressure to stop the vehicle without adequate brake fluid levels. If your car is low on brake fluid, you may notice a soft or spongy feeling brake pedal.
Contaminated Brake Fluid
Another typical result of a malfunctioning brake master cylinder is contaminated brake fluid. Contaminated brake fluid occurs due to failed seals somewhere in the brake system. When brake fluid contacts air, it becomes contaminated and loses its effectiveness. You will notice many of the same symptoms of master cylinder problems, such as a soft or spongy brake pedal or reduced stopping power. The new brake fluid is clear with a slight yellow tint. Brake fluid can become discolored over time due to age or contamination. If your brake fluid is a dark red or brown, ask your mechanic to change your brake fluid.
Check Engine Light
Another indication that your brake master cylinder may be failing is the presence of the check engine light. While many common issues can cause the check engine light to come on, modern cars are equipped with sensors in the brake master cylinder that monitor fluid levels and pressure. This is intended to alert the driver when there’s an issue with the brake system before it gets so severe that the car can’t be stopped.
You mustn’t ignore the signs of a failing master cylinder. Eventually, a failing master cylinder will severely diminish your ability to stop your vehicle safely. Fortunately, master cylinder repair is a relatively common job that your mechanic can perform without much trouble. Nevertheless, if you notice any of these signs of a failing master cylinder, see your auto care professional immediately.