Shaking While Braking?

raochoa · February 5, 2008

I ordered some 24's online and went to Discount Tire to mount and balance. When they were done I took my truck on a test drive, and when I brake there is a violent "shake", even when I brake at low speeds. I took the truck back to discount tire and they said I needed bigger rotors. The truck is an 07 sierra nbs. I think they screwed something up and dont want to be responsible. WTF? Anyone experience this before??

Bish · February 5, 2008

I ordered some 24's online and went to Discount Tire to mount and balance. When they were done I took my truck on a test drive, and when I brake there is a violent "shake", even when I brake at low speeds. I took the truck back to discount tire and they said I needed bigger rotors. The truck is an 07 sierra nbs. I think they screwed something up and dont want to be responsible. WTF? Anyone experience this before??

If the new wheels and tires are balanced properly, the only other place to look is rotors. Warped rotors will do that. Big heavy wheels can cook stock brakes pretty quickly and once the rotors overheat, they may be toast.

2000DV4.8 · February 5, 2008

Do you have drums in the rear? If so, there is a clip on the drum that is used to hold the drum together during the manufacturing process that will not allow some aftermarket wheels to sit properly. Remove this clip, and the vibration should disappear (the clip is no longer needed, so don't worry about the drum falling apart or anything).

pm26 · February 5, 2008

Going to a Discount tire store to have this done was a mistake. You got a "discounted" installation. Secondly, installing anything bigger than 20 inch wheels on a new 1/2 ton pickup is nonsense. In fact, I am certain that if you claim the shaking problem under GM warranty with these wheels on, they will deny your claim. As they should.

hubbycap · February 5, 2008

Do you have drums in the rear? If so, there is a clip on the drum that is used to hold the drum together during the manufacturing process that will not allow some aftermarket wheels to sit properly. Remove this clip, and the vibration should disappear (the clip is no longer needed, so don't worry about the drum falling apart or anything).

+1

Check for clips.

24"? What kind of tractor did you say this was for?

pm26 · February 5, 2008

The problem can be a lot bigger than removing a drum clip. Most drums have steel balancing weights welded to the periphery of the drum and if some aftermarket wheels are used without a proper spacer, and the wheels are put on and lugnuts tightened, the brake drum will get completely and permanently distorted. Worse yet, driving the vehicle like this may bend the axles shafts. I have seen this happen many years ago on a '77 Camaro when aftermarket Cragar wheels were installed and drum weight were not removed, nor spacers were used. It took two new axle shafts, axle shaft bearings, and two new brake drums to fix the problem. Hopefully you will not run into this scenario, but beware that it is a distinct possibility.

Suggest you jack up the rear end by the differential pumpkin and start the engine and place in drive. Then watch the rear wheels spin. If you see up and down movement on the wheels, most likely you have bent the axle shafts and destroyed the drums.

C & A s Dad · February 5, 2008

Now that someone else has said it, I will go ahead and post what I wanted to post.

Hmmm, 24" wheels on a truck with a suspension engineered for 17", 18" or possibly 20" wheels and it is shaking. Let me think about his for a while.

Where is Redvett, I am sure he can add to this.

I hate you are having the issue, but I have seen this too many times.

Not long ago I passed a new or almost new Escalade and it was shaking so violently that he could hardly hold it. I guess he did not care because in his mind he was "stylin" with those 28s.

hubbycap · February 5, 2008

The problem can be a lot bigger than removing a drum clip. Most drums have steel balancing weights welded to the periphery of the drum and if some aftermarket wheels are used without a proper spacer, and the wheels are put on and lugnuts tightened, the brake drum will get completely and permanently distorted. Worse yet, driving the vehicle like this may bend the axles shafts. I have seen this happen many years ago on a '77 Camaro when aftermarket Crager wheels were installed and drum weight were not removed, nor spacers were used. It took two new axle shafts, axle shaft bearings, and two new brake drums to fix the problem. Hopefully you will not run into this scenario, but beware that it is a distinct possibility.

Syggest you jack up the rear end by the differential pumpkin and start the engine and place in drive. Then watch the rear wheels spin. If you see up and down movement on the wheels, most likely you have bent the axle shafts and destroyed the drums.

Very good advice. I might also add that if the up and down movement doesn't exist subsequent to swapping wheels front to rear then you may have eccentric machining on your wheels or another hub-centric problem (wheel center-bore too large.)

willysts · February 5, 2008

I ordered some 24's online and went to Discount Tire to mount and balance. When they were done I took my truck on a test drive, and when I brake there is a violent "shake", even when I brake at low speeds. I took the truck back to discount tire and they said I needed bigger rotors. The truck is an 07 sierra nbs. I think they screwed something up and dont want to be responsible. WTF? Anyone experience this before??

That's usually the brake rotors being warped causing that vibration while braking.

Draenor · February 5, 2008

Do a search,

I think this has to be the 4th or 5th thread similiar to this.

The vehicle is most likly not designed to handle the added weight and size of these wheels.

My other guesses are what BISH and Dan have alreay mentioned.

good luck

Not long ago I passed a new or almost new Escalade and it was shaking so violently that he could hardly hold it. I guess he did not care because in his mind he was "stylin" with those 28s.

I seen this all too many time. These wheels are hard to balance, or require so much weight to balance them its not worth the effort.

Lincoln30 · February 5, 2008

The rear disk equipped GMT900 also have the brake clips since the rear is a mini drum/disk. I had to remind the shop putting the wheels on to remove them.

2004GMC1500CC · February 6, 2008

The rear disk equipped GMT900 also have the brake clips since the rear is a mini drum/disk. I had to remind the shop putting the wheels on to remove them.

Discount removed them when my 18's where installed.

irongoats · February 6, 2008

Cheese and Rice people the truck can handle the bigger rims. You old foggies need to lighten up and keep yours stock. It's been said already the stockers have spacers on the studs or real drums. Take them off remount you'll be fine. That size is badass on a 1/5 ton.

j.roffel · February 6, 2008

Cheese and Rice people the truck can handle the bigger rims. You old foggies need to lighten up and keep yours stock. It's been said already the stockers have spacers on the studs or real drums. Take them off remount you'll be fine. That size is badass on a 1/5 ton.

Is a 1/5th ton just a little smaller than a 1/4?

Draenor · February 6, 2008

You old foggies need to lighten up and keep yours stock.

I just mentioned that the truck was not designed to have the bigger wheels. No need to remind me of my age. There more involved in just puting bigger wheels/tires on a vehicle. The added stress will cause premature failure on the drivetrain ,brakes, and suspension. If you do it properly, there is nothing wrong with it, as long as it looks good.

BTW, I have no need to look like this.