Not long after I purchased the car, I went to 18" wheels.. and shortly after the cars brake light came on. It was annoying to see, but the brakes functioned fine and I didnt act on it. Now.. the brake pedal is "spongy" and I am pushing it further and further towards the floor to get the same effect.
Car has under 20k miles on it... I wonder if I voided the warranty on the brakes with the wheels?? and.. I wonder what the problem could be?? Any thoughts? [/b]
Unless you mucked around with your brakes while the wheels were off, putting 18" rims on the car has nothing to do with whatever your current problem is.
spongy pedal is evidence of air somewhere in the system, possible causes of that could be opening a bleeder valve or disconnecting a brake hose and reconnecting it without bleeding the system to name a couple.
extremely hard use of your brakes such as track days could boil the fluid, that will give you a spongy pedal
I'm guessing that you bought the car used? Perhaps there were some already developing issues with the brakes before you even put the wheels on that just happened to show up after the new wheels.
If you're not comfortable and capable of doing your own brake system work I would suggest taking it to a reputable shop, pronto. As a matter of fact that's exactly what you should have done as soon as you saw the brake system warning light come on instead of just "putting up with" the "annoyance" and continuing to drive as if nothing was wrong. Those lights are usually for a reason.
On second thought, cancel my previous suggestion that you tackle this yourself. Your reaction to the warning your car was giving you tells me you're not exactly inclined to take good care of it's mechanical condition. Seek professional (mechanical) help ASAP, before your brakes fail completely and you cause an accident with some innocent bastard who just happened to be unlucky enough to be in your path. At least you don't live close enough that I have to worry about it being me.
And you're an Insurance Agent...? Good Grief.!! :nono: