Vibration when braking after new wheel/ tire install

**TCSOboss** · 08-31-2009, 06:42 AM

I have a 07 Silverado 1500 crew cab... stock tires were (i believe) 275/50R17... i bought new rims and tires for this truck and now it vibrates alot, and sometimes violently when i brake. The new rims are 20" with 275/60R20 Cooper Zeon all terrain tires... Do I have too much tire under my truck for the stock braking system... does any one know how to fix this problem or whats causing it?

**Henchman** · 08-31-2009, 07:17 AM

It's normal. Mine does the same thing. I put 20" wheels and tires on my 2007 Silverado and notice a lot of vibration. I just brake a little easier and a loittle sooner.

**d-web620** · 08-31-2009, 11:51 PM

I have the same prob. i just put some 22's on my 08 silverado and it vibrates like crazy when i brake

**CarpenterGuy** · 09-01-2009, 12:16 AM

my truck shakes but i have stock rims/tires right now.

**Loggerhead Mike** · 09-01-2009, 01:41 PM

your rotors are warped. next time you brake try and feel if the vibration is more in the steering wheel (the wheel will shimmy) or more noticible in the seat or floorboard. that will tell if you if your front rotors or rear are warped worse. usually your front

the new chevys are notorious for warping rotors. too big a tire and not enough metal in the rotors

and it is not normal. warped rotors will reduce your braking distance and wear your steering parts out faster

**CarpenterGuy** · 09-01-2009, 07:52 PM

i've been meaning to take my rotors off and have them turned for some time now.

**Slik** · 09-02-2009, 02:21 AM

Yep, warped rotors (or possibly unevenly worn pads...less likely). Not something you want to ignore long term.

Another option is to upgrade to larger rotors and brakes, particularly up front, especially if running a larger diameter (heavier) rim. It can be a bit pricey (usually at least $300-$500 in parts for the fronts alone in most cases IIRC), but the improvement over stock and greater confidence in upgraded stopping ability to go along your upgraded rotating mass can be a great payoff as well. This probably applies more to those who are going to a 24"+ size rim.

**vms4evr** · 09-02-2009, 04:23 PM

Originally Posted by Loggerhead Mike

your rotors are warped. next time you brake try and feel if the vibration is more in the steering wheel (the wheel will shimmy) or more noticible in the seat or floorboard. that will tell if you if your front rotors or rear are warped worse. usually your front

the new chevys are notorious for warping rotors. too big a tire and not enough metal in the rotors

and it is not normal. warped rotors will reduce your braking distance and wear your steering parts out faster

Rotors warping? New chevys? What years and models? Is there a TSB out on this? Since you're a GM Tech I assume you are seeing this a lot in the shop? I'm just curious.

I have an 06 K1500 with stock 17" rims and 265/70-17, GoodYear RT/S with lots of tread on them.

The rotors look like they are fine for the size wheel/tire combination. I'm not sure if the front pads on my truck are original are not. Just bought the truck. They have plenty of meat left on them and the truck has 50K on it. The rotors look original. I can easily overcome the tires under braking and engage ABS and cause some lockup. So I have more brakes than tires at this point.

**TCSOboss** · 09-02-2009, 08:07 PM

thanks guys... ended up being the drums in the back, one was warped and the shoes were almost toast... then the front pads had to be replaced too, they were almost ready for a change as well... but thanks for the input... much appreciated...