* Warped Rotors: This is the most common cause. Over time, rotors can warp due to overheating (hard braking, especially), age, or uneven wear. When a warped rotor rotates, it causes the brake pads to grab unevenly, leading to the pulsating feeling in the pedal.
* Sticking Caliper: A caliper piston that's sticking or not retracting properly can cause uneven brake pad pressure, resulting in pulsation. This can also lead to uneven rotor wear, exacerbating the problem.
* Bad Brake Pads: While less likely to *cause* pulsation on its own, severely worn or unevenly worn brake pads can contribute to the problem if it's already present from warped rotors.
* ABS Issues (Less Likely): In some cases, a problem within the anti-lock braking system (ABS) can cause a pulsating sensation. However, this usually involves other symptoms, such as ABS warning lights, and is less likely to be the sole cause of just pulsating brakes.
What to do:
1. Visual Inspection: If you're comfortable working on your vehicle, carefully inspect your brake rotors and pads. Look for any obvious signs of warping (uneven surface on the rotor), scoring, or excessive wear. Check the calipers for free movement and sticking.
2. Professional Inspection: It's best to have a qualified mechanic inspect your brake system. They have the tools and expertise to diagnose the problem accurately and safely. Ignoring brake problems can be dangerous.
3. Don't Drive It: Driving with pulsating brakes is unsafe. It reduces braking effectiveness and can cause further damage. Limit your driving to only what's absolutely necessary until the issue is resolved.
The mechanic will likely recommend replacing the warped rotors and possibly the brake pads, and possibly resurfacing or replacing the calipers depending on their condition. Getting this fixed promptly is crucial for your safety.
