bradlasvegas

I just bought 20 inch tires and wheels for my 2007 silverado (new body), put them on and they look great took them out for a test drive and the trucks tracks straight as an arrow with no wobble at all. When I applied the brake they pulsed (dum dum dum dum dum...) slowed me down but the pulsing obviously is not supposed to happen check tire sensor unit light came on. pulled them off and no rub spots , put the stock rims and tires back on and problem went away light went off. Any suggestions.
thanks.
b

charlie pachanga

Factory wheels have sensors, you need to remove the sensors and add them to the new wheels. You need to buy four new tpms valve stems gm part number 15263240.
The vibrating is caused by not removing the retainer clips from the rear wheel brakes. there should by two per rear wheel.

rms

sorry I missed the boat on this one miss read the question. But remember changing the wheels to the larger size will void the warranty if the dealership does not do the work.

fireman526

My dealership told me that if you go up to a size that they use from the factory ie. 20", than it will have no effect on your warranty. The problem comes in when you put on 24" and up, then it only effects the components its attatched to, not the whole warranty. For example, it would effect the suspension warranty.

SILVERADOMAN

Hey i also am having the exact problem on my 07 silverado i have 22" rims and oly get the pulsating when i brake i put factory tires back on and the problem goes away did any of these suggestions work?

swoosh1977

Try re balancing the tires. I had an 05 Tahoe that I put 20's on and it did the same thing untill i rebalanced them. Afterwards no wobble.

charlie pachanga

Definatly remove the clips on the rear studs.

SILVERADOMAN

I balanced the tires and took off the four little clips i cant believe it the pulsation is gone i still cant understand why the pulsation only happened when i applied the brakes and not at cruising or high speed

SILVERADOMAN

Thanks guys !

charlie pachanga

When you apply the brakes the pads expand and then you feel the improper seating of the wheel on the drums. The rear brakes pulse and that back pressure is transmitted via the hydraulics to the front brakes and the brake pedal.