Why Is My Vehicle Shaking? Causes & Fixes Explained Maxtrac Suspension Why Does My Car Shake When I Brake From 60 to 80? Blog AutoTechIQ VIBRATIONS WHEN ACCELERATING, COASTING, BRAKING. FIX! If your car shakes at high speed the cause is often mechanical imbalance. Small issues become more noticeable as speed increases. Unbalanced tires are a common reason, creating vibration that grows Many drivers overlook the small signs their tires give them, uneven wear, low pressure, tiny cracks or that slight vibration when you drive. These little things may seem harmless, but they can quickly Why Does My Car Shake at Idle but Smooth Out While Driving?