Fixing Car / Steering / Pedal Vibrations (2)
Reason #2: The Brakes
Here, the vibration occurs only when you apply the brakes.
Is your car equipped with ABS? Your brake pedal WILLshudder if you slam on the brakes very hard, or on a loose / slippery surface. This is usually accompanied by a metallic clicking sound. Nothing to worry about. However, check that the ABS warning light (on the instrument cluster) isn't showing a malfunction.
Your brake discs are warped or uneven. Check for uneven wear of your discs / drums. Lateral runout of any one disc (or radial runout of any one drum) shouldn't exceed 0.1 - 0.2 mm. Have the discs turned / skimmed on a lathe. Authorised service centers don't bother with skimming discs / drums, they simply replace them. An after-market garage can perform this simple job at a fraction of the cost of new discs. For your safety, it's imperative that the discs be replaced if they are worn out or warped beyond the maximum acceptable specifications.
Are your brake pads / brake shoes worn out? They could be "skipping" on the disc / drum while braking. New pads of poor quality also tend to skip; always use OEM parts or better. Some cars may show poor or "grabby" brake grip with vibrations & noise when starting off from cold - this disappears as soon as the brakes warm up.
Mostly older cars: A seized, rusted, dry or worn out brake caliper pin can cause vibrations while braking. Also likely if you have driven through water / mud and parked the car without a proper cleanup.