Vibration through brake pedal - Mercedes Benz SLK Forum

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#1 Old 03-18-2019
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Vibration through brake pedal

Yesterday I noticed that when sitting in traffic with my foot on the brake, I could feel a slight tapping/vibration coming through the pedal. I couldn't feel it when braking, only when stationary. The tapping occurs at regular intervals, say every 2 seconds. I thought perhaps my pads are a bit loose, so I pressed down hard on the pedal to make sure there was good contact, but same feeling.


Any ideas? It's more obvious with the foot on the brake pedal, but can be felt (slightly) with your foot on the floor. Is there some braking mechanism down that area that could be loose?
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#2 Old 03-18-2019
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I would suspect ABS, but it could be engine related also. If I understand you feel it also when stop without your foot on the brake peddle. That means to me that it something on the engine.
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#3 Old 03-21-2019
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I agree it sounds like the ABS. Any lights on the dash while it is doing it?
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#4 Old 03-21-2019
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Not abs if stopped. If rolling unlikely abs unless it's slippery/sliding. Vibration in the pedal while coming to a controlled (or even harder) stop probably indicates a warped rotor.

I've learned to live with my warpedness

NOT serious just irritating.

As it only happens while you're already at a complete stop, then I got nuthin'.


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#5 Old 03-21-2019
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Loose/broken exhaust bracket?


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#6 Old 03-22-2019
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Quote:
Originally Posted by LeonardoDaBenz View Post
Not abs if stopped.
If the ABS is working properly, yes. The assumption is something is malfunctioning.

The exhaust is a good idea also. What kind of noise is it and can you feel it anywhere else?
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#7 Old 03-22-2019
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Quote:
Originally Posted by jet_fl View Post
If the ABS is working properly, yes. The assumption is something is malfunctioning.

===
Found this for abs malfunction. It's not authoritative but might give some insight
https://mechanics.stackexchange.com/...-caused-by-abs


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#8 Old 03-23-2019
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Thanks for the replies. I've done a bit more driving today and noted a few things

* No warning lights/ABS light is on
* Can only feel when at a stop
* Felt through the brake pedal, but can feel with foot on the floor too (but lighter)
* Interestingly - can only feel it with the heater fan on! Could be something in the heating system
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#9 Old 03-23-2019
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BUT if the ABS light is on, then it's not the heater but something (probably) more serious that needs resolution.

Maybe speed sensors?

With no scanner (for codes) posted, we're only guessing here.


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#10 Old 03-23-2019
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Quote:
Originally Posted by LeonardoDaBenz View Post
BUT if the ABS light is on, then it's not the heater but something (probably) more serious that needs resolution.

Maybe speed sensors?

With no scanner (for codes) posted, we're only guessing here.
ABS light is not on. Sorry for confusing wording
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