Grinding sound when backing up

6717 Views 8 Replies 4 Participants Last post by bigbadbowtie088, May 17, 2009

bigbadbowtie088

Discussion Starter · May 16, 2009

Ok, I noticed this yesterday after washing my brakes out from the last offroading trip, plenty of mud in them. But anyways its coming from the front end, but only when I back up my driveway. My driveway is on a slight hill, nothing major. I can feel the vibrations through the steering wheel along with in the pedals. I checked and I don't see anything grinding, checked the control arms, which I also sprayed some silicone lubricant on where they meet with the frame. I know if I take it to chevrolet they are going to drive it around, burning my gas and tell me they can't replicate it. I took the truck in a few weeks ago for what I feel is excessive vibration when idling, the guy told me it's normal.

Any ideas what this might be? Remember its a 2wd so I know it can't be the front actuator or anything with the front drive shaft.. seeing how I don't have one. It's only when I back up my driveway but I have to do this quite often to get my trailer out.

Thanks

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tallcorn

· #2 · May 16, 2009

Maybe warpped rotors and worn pads???

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bigbadbowtie088

Discussion Starter · #3 · May 16, 2009

I forgot to mention that I changed the front brake pads not too long ago. The rotors looked fine when I changed the pads.

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tallcorn

· #4 · May 16, 2009

"The rotors looked fine"? Did you check them for runout? The vibrations weren't there before or you didn't mention them so maybe the rotors have warped since the new pads were installed. The rotors may have rusted after you washed the mud off. It takes a little braking to clear the rust and that can cause some strange sounds backing down a driveway. If you drive the truck and get the brakes warmed up and then you have vibrations/pulsating of the brake pedal I still suspect the rotors. Those new pads or how they were installed can cause noisy brakes, too. Some pads are noisy when backing up. My wife's car had that problem until I put on new rotors and pads. The brakes didn't bother me but listening to my wife did.:crackup:

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bigbadbowtie088

Discussion Starter · #5 · May 16, 2009

Brakes and rotors checked out A-okay. I did notice there is a part that is not on the driver's side front rotor. This missing part (circled in yellow) allowed "play" with the rotor on the driver's side. Although I do believe that when I tightened back down the lug nuts that this prevents most of the movement. Let me know what you think. It continues to make the same sount, even after cleaning the rotors more.

Passenger side

Driver's side

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SteveTB03

· #6 · May 16, 2009

that is just a c clip kinda thingy from the factory its worthless i took mine off a while back as lobg as you tighten the lugs down properly it will be fine

does the vehicle pulsate when you brake?

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tallcorn

· #7 · May 16, 2009

You said you recently replaced the pads. Maybe the new pads didn't break-in right or they needed pad lube to cushion the pads. This link is good reading about brakes.

http://www.raceshopper.com/tech.shtml#ceramic_pads

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91RS

· #8 · May 16, 2009

That clip is just from the factory to hold the rotor in place on the assembly line. Has no other purpose because the rotor will be held in place by the wheel when the lugs are tight. That clip actually HAS to come off with aftermarket wheels or it will cause a pretty bad vibration. How many miles are on your truck?

As for the vibration, I'll quote the pack in asking if you've cleaned the throttle body lately? Though, there are a few other things that can cause vibrations on these such as a fan clutch and even motor mounts. Or since you've been in the mud, do you have any mud all over the fan or any of the accessories? Probably a good place to start is to take off the belt and see if the vibration is still there.

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bigbadbowtie088

Discussion Starter · #9 · May 17, 2009

91RS said:
That clip is just from the factory to hold the rotor in place on the assembly line. Has no other purpose because the rotor will be held in place by the wheel when the lugs are tight. That clip actually HAS to come off with aftermarket wheels or it will cause a pretty bad vibration. How many miles are on your truck?

As for the vibration, I'll quote the pack in asking if you've cleaned the throttle body lately? Though, there are a few other things that can cause vibrations on these such as a fan clutch and even motor mounts. Or since you've been in the mud, do you have any mud all over the fan or any of the accessories? Probably a good place to start is to take off the belt and see if the vibration is still there.

I checked the throttle body the other day, it was still clean. I cleaned it probably 5-10k miles ago. Right now I'm at 55,2xx miles. I checked the fan and the moving parts under the hood and couldn't see any mud. I guess it could be the fan clutch again. I'll be taking it in to northpoint on monday.

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