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Mystery Noise w/ brake pedal

justanotherTahoe

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justanotherTahoe Enthusiast

justanotherTahoe

Posted
Posted

I have a mystery noise, It seems like when you fix one noise, another one sneaks up. THat should be no surprise being a typical GM. Initially I had the wheel shimmy so I re-greased the Intermediate Steering shaft. That worked.

 

At the same time there was a grinding noise coming from the front right. I jacked the right side up and checked the wheel, and oh man was it loose. Long story short, I had to replace the front right wheel hub assembly ($350 for part at dealer, as the part is not available at Discount Auto Parts, they tried selling me a 4wd hub). I figured since it was apart I might as well replace the rotors, since they were slightly warped. No problem, now the truck has new rotors and pads. THis solved the grinding noise.

 

Here is where the mystery comes in. When I brake, there is a slight bumb in the brake pedal. It kind of sounds like a duck, and you cannot hear it outside of the truck. It only makes the noise when I brake to 5mph. I can brake to 6 mph, then let off and reapply the brakes at 4mph and it will not do it. It does not matter how hard or soft you brake, you get the little "bump" bump" in the pedal when it slows to 5mph. THe noise isnt coming from the calipers but the pedal.

 

How can changing the rotors and pads and one of the hubs cause this problem? Has anyone else had such a problem with their pedal?

 

I didnt bleed the lines and I did check for air bubbles in the brake reservoir and there was nothing.

ANy ideas, I have done some searching on this and other forums and cannot find a similar symptoms out there.

ANy input would be appreciated.

 

Oh yeah, it is a 2002 Tahoe LS 2wd with 53,000 miles. It needs new tires, but I am positive this isnt where the noise is coming from.

cit1991 Enthusiast

cit1991

Posted
Posted

Sounds like the ABS is pulsing (only once). Did you mess up the ABS wheel speed sender while working on the brakes?

justanotherTahoe Enthusiast

justanotherTahoe

Posted
  • Author
Posted

I did get the sensor in properly, only thing is. I didnt replace the actual sensor, I just used the old sensor. I did clean it up real good, as I did not think it would make that much of a difference.

 

I was hoping that wasnt it, because I didnt want to have to take the wheel back off. It is pretty annoying though, so I may have to.

Thanks for the reply..

 

oh yeah, i should mention that the abs light has not come on at all, so i didnt think this was it.

justanotherTahoe Enthusiast

justanotherTahoe

Posted
  • Author
Posted

Being late I dont have time tonight to change out the sensor, so I decided to take out the ABS fuse to see if that was it. Sure enough, I took the fuse out and the noise is gone. So tomorrow I will definately swap out the old sensor for the new one.

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