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Why do my brake pedal and steering wheel shake while braking at higher speeds?

Several factors can contribute to the shaking or vibration you experience while braking at higher speeds. Here are some common causes:

1. Brake Rotors:

- Warped or Uneven Rotors: Over time, brake rotors can become warped or uneven due to excessive heat or uneven wear, causing pulsations in the brake pedal and vibrations in the steering wheel when braking.

2. Brake Caliper Issues:

- Sticking or Misaligned Calipers: If your brake calipers are not functioning properly or become misaligned, they may not apply even pressure to the brake rotors, resulting in vibration and shaking.

3. Suspension Problems:

- Worn Suspension Components: Worn suspension parts such as control arm bushings, ball joints, or tie rod ends can cause instability in the vehicle's handling and lead to shaking while braking.

4. Wheel Imbalance:

- Misaligned or Improperly Balanced Tires: If your wheels are not correctly aligned or balanced, it can create vibrations that become more noticeable at higher speeds and during braking.

5. Driveshaft Issues:

- Defective Driveshaft or Universal Joints: Problems with the driveshaft, such as worn universal joints or a damaged driveshaft, can cause vibrations felt through the steering wheel and the brake pedal.

6. Loose Steering or Suspension Components:

- Loose Bolts or Nuts: If there are any loose bolts or nuts in the steering or suspension components, it can cause shaking and vibrations during braking.

7. Brake Fluid Problems:

- Air in Brake Lines: Air pockets in the brake fluid can cause spongy brake pedal feel and vibrations when braking.

If you are experiencing shaking or vibration in the brake pedal and steering wheel, it's important to have the vehicle inspected by a qualified mechanic or automotive technician to determine the exact cause and ensure safe and smooth braking performance.