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Symptom

Brake pedal pulses or vibrates

The pedal pushes back in a rhythm as you brake, often with the steering wheel shaking in time with it. The rhythm is what identifies it: a pulse tied to road speed comes from the discs, while a rapid buzzing that only appears in an emergency stop is the anti-lock system doing its job and is entirely normal. People confuse the second for a fault and lift off, which is exactly the wrong response. A pulse that appears only after a long descent, and fades once things cool, is a different matter again and points at heat rather than distortion.

Also described as: brake pedal pulsing, pedal vibrates when braking, juddering when braking, brakes shudder, steering shakes when braking, pulsating brakes, پدال ترمز میزند, لرزش هنگام ترمز, دیسک ترمز تاب دارد, pedal freno vibra, vibra al frenar, volante tiembla al frenar, اهتزاز عند الفرملة, رجة في دواسة الفرامل, المقود يرتج عند البريك

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What this usually means

Separate a pulse you feel only under braking from the anti-lock system doing its job, because the second is not a fault at all. A rapid pulsing with a grinding or buzzing noise during hard braking, or on a slippery surface, is the anti-lock system working — that is exactly what it feels like, and drivers who have never experienced it often report it as a failure.

A pulse that occurs during ordinary, gentle braking is different, and it is almost always the discs.

The mechanism is worth stating because the usual explanation is wrong. Discs are rarely 'warped' in the sense of being bent. What varies is thickness — uneven pad deposits transferred onto the disc face, or corrosion, producing a surface the pad grips harder in some places than others. That thickness variation is what the pedal feels, and it is measurable with a micrometer where 'warping' is not.

Which pedal or wheel it is felt through says where. Through the brake pedal points at the front; through the seat or the whole car more often at the rear. A vibration through the steering wheel under braking is the front discs almost every time.

Excessive run-out is the other cause and it is often not the disc's fault. Dirt or corrosion between the disc and the hub face, or an unevenly torqued wheel, holds a perfectly good disc out of true — which is why cleaning the hub face is part of fitting discs, and why wheel bolts should be torqued properly rather than run up with a gun.

A pulse that appeared after new discs is usually bedding or hub cleanliness, not a faulty part.

Working through it

  • Rapid pulsing with a buzz, only in an emergency stop or on a slippery surface

    Likely cause
    The anti-lock system working — this is what it feels like
    How to confirm it
    Note the conditions. Hard braking or low grip is the design working, not a fault.
    What fixes it
    No repair. Worth explaining to a driver who has not felt it before.

  • Pulse during ordinary gentle braking, felt through the pedal

    Likely cause
    Thickness variation in the front discs — uneven pad deposits or corrosion rather than a bent disc
    How to confirm it
    Measure disc thickness variation with a micrometer at several points, and run-out with a dial gauge.
    What fixes it
    Renew or machine the discs and fit new pads. Bed them in properly to avoid repeating it.

  • Vibration felt through the seat rather than the pedal

    Likely cause
    The rear discs rather than the front
    How to confirm it
    Where it is felt is the discrimination. Measure the rear discs the same way.
    What fixes it
    Renew or machine the rear discs and pads.

  • Appeared shortly after new discs were fitted

    Likely cause
    Hub face not cleaned, wheel bolts unevenly torqued, or pads not bedded
    How to confirm it
    Measure run-out with the disc fitted, then again after cleaning the hub face. The difference names it.
    What fixes it
    Clean the hub face to bare metal, refit, and torque the wheel properly. Bed the pads in as specified.

  • Pulse with a car that has stood unused

    Likely cause
    Corrosion where the pads sat against the discs, producing localised thickness variation
    How to confirm it
    Note the standing history. Light cases clean off with use; heavy pitting does not.
    What fixes it
    Renew the discs where the pitting is deep. See the stood-unused entry for the wider pattern.

  • Vibration present without braking as well

    Likely cause
    Not the brakes — wheel balance, a bent rim, or a driveline fault
    How to confirm it
    The braking dependence is the discriminator. A balance problem varies smoothly with road speed.
    What fixes it
    Balance the wheels or diagnose the driveline. See the vibration entry in the driving group.

Codes that produce this symptom (6)

Listed with the codes that most typically present this way first — the likeliest place to start.

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.

Others with this symptom

Be the first to write this up

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What makes one worth reading:

  • The car — make, model, year and engine. The same fault behaves differently on each.
  • What you measured, not only what you replaced.
  • What actually fixed it — or that nothing did, which is worth knowing too.

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