Brake pedal vibration escalating electrical issues

WYLEY4

MEMBER
2006 HYUNDAI GENESIS COUPE
2.0L
4 CYL
2WD
AUTOMATIC
80,000 MILES

Recently my brake pedal started pulsing quite badly mainly when turning left at a slow speed, but only occasionally it got worse and more often. I put it in to mechanics they looked at it and did the mot at the same time. The car passed mot and they could not find anything wrong. I went to another garage same thing could not find anything wrong apart from corrosion on a strut which was replaced car was okay for a few days then problem came back. Now along with vibration the whole dash board lights up when brake pedal is pressed even with lights off and rear brake lights are always lit. Of course I am not able to drive it in this condition.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

What lights are coming on? Are you able to identify anything specific? Has the ABS or stability control light come on?

Let me know.
Joe

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Thursday, November 28th, 2019 AT 8:59 PM

WYLEY4

MEMBER
3 POSTS

Hi Joe,

Thank you for your time and quick response. Regarding the lights no warning lights come on the whole dash lights up as if the lights were turned on when the brake pedal is pressed also the rear brake lights were stuck on I started the car last night and these anomalies stopped. I am wondering if these faults are a byproduct of what is happening with the braking system? The mechanics I have used are reputable and say the brakes are mechanically fine but last time I drove the car the pulsing pedal problem arose quite severely. At one point and took slot longer to go back to normal. Thank you for your help.
Sean

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Friday, November 29th, 2019 AT 12:59 AM

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Interesting that the brake lights were stuck on. That sounds like a simple switch issue. However, the other issues are different. To me (and please bear with me. It's hard not being there.) It sounds like the ABS is actuating. You will get a vibration when it actuates. Since no lights indicating an ABS issues is turning on, my first suspect is there is a bad wheel speed sensor. If the sensor is indicating one of the wheels isn't turning and the others are, it will actuate the ABS. If the sensor is still sending a signal (good or bad), the system won't know it's bad, but rather, simply think it's doing its job.

At this point, you need to have a live data scanner that can identify wheel speeds at each wheel while driving. By performing this, a tech can see if all speed sensors are identifying equal speeds or if one is way off.

I hope that makes sense. Let me know if it seems like the ABS is turning on.

Joe

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Friday, November 29th, 2019 AT 7:21 PM

WYLEY4

MEMBER
3 POSTS

Thank you for your advise and really appreciate your help on this one. Will be taking my car in next week and request the recommendations you suggested be tested.

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Saturday, November 30th, 2019 AT 4:48 PM

JACOBANDNICKOLAS