I have a 2007 hummer h3 and a weird grinding knocking feeling can be felt in the pedals but I am unable to hear any actual grinding. My hummer does have a front diff leak through the pinion seal but it's extremely small, uses about 6 ounces every 10,000 miles and the rear doesn't leak and has stayed filled. Theirs no movements in any of the suspension or steering besides the common steering knock but this is different then the steering knock. I have a wheel sensor code and abs code c0131 but I'm unsure if that would be the cause of the feeling? I bought this hummer last year and have put about 20,000 miles on it and I've had the trans rebuilt and it seems like the front diff has been replaced before I got it cause theirs not a speck of rust on it and I replaced the front drive shaft with a brand new one, just giving all the information I can think of to help out anyone who might know of the cause. It still drives great and accelerates just fine holds it speed and no play in the steering it drives just as good as it always has besides this new feeling in the pedals

 

Do the brake lights work?

 

yes? I believe so? Is their something related to brake lights and grinding?

 

You believe so?
You have a "weird grinding knocking feeling can be felt in the pedal".
You have abs code c0131.
You know what it feels like with abs activated.