* Warped brake rotors: This is the most common cause. Heat from repeated braking can warp the rotors, causing them to wobble and shake the front end. You'll often feel the vibration most strongly when braking at higher speeds.
* Worn brake pads: While worn pads themselves don't *directly* cause shaking, if they're severely worn, it can lead to uneven pressure on the rotors, exacerbating any existing rotor warp or causing a new one.
* Sticking caliper: A brake caliper that's sticking or binding can cause uneven braking force, leading to pulsations and shaking. This is often accompanied by uneven brake pad wear.
* Bad wheel bearings: Worn wheel bearings can introduce play in the wheel, leading to vibrations that are felt more strongly under braking. You might also notice a humming or rumbling sound, especially at higher speeds, even when not braking.
* Ball joints or tie rod ends: Loose or worn ball joints or tie rod ends in the steering system can contribute to vibrations that become more pronounced under braking. This is usually accompanied by other steering issues, like play in the steering wheel or wandering.
* Uneven tire wear: Although less likely to be the *primary* cause of braking shake, severely uneven tire wear can contribute to vibrations that are amplified during braking.
Troubleshooting Steps:
1. Visually inspect the brake rotors: Look for obvious warping, scoring, or discoloration. A perfectly flat rotor should be smooth and even.
2. Check brake pad thickness: Make sure your brake pads have sufficient material remaining.
3. Feel the rotors for heat: After a short brake application, carefully feel the rotors. If one is significantly hotter than the other, it might indicate a sticking caliper.
4. Check for play in the wheels: Grab each wheel at the top and bottom and try to move it in and out. Excessive play indicates a worn wheel bearing. Similarly, check for play in the steering components (ball joints, tie rod ends).
5. Inspect tires for uneven wear: Check for cupping, feathering, or other signs of irregular wear.
Important Note: If you're experiencing significant braking shake, it's best to have a qualified mechanic inspect your vehicle. Driving with compromised brakes is dangerous. Don't attempt any repairs yourself unless you have the necessary experience and tools. Ignoring the problem could lead to a brake failure.
