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I have a 2004 Acura EL, which has 4-wheel disc brakes. When I first got the car in the winter, we had winter tires fitted to the car, so I thought it was just vibrating because of the deep tread in the tires. But yesterday I had the stock alloys fitted with summer tires, and I still get vibration while braking. The wheels have been balanced, and the alignment is fine (I only have 7,000 km on the vehicle). This never happened in the Civic, is it because I have 4 discs? Are my rotors somehow warped?
I don't know what's wrong, since, like I said, it has been like this since I got the car in January. I just thought it was because I had winter tires on the car, but now that I have summer tires on, the vibration hasn't gone away, which is puzzling.
It's coming up to the 8,000 km mark, so I'll have to take it in to get serviced anyway in about 2 weeks or so. What should I tell them? Would this be covered under warranty if infact the rotor(s) is/are warped? I hope it's nothing major

 
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sounds like your got warped rotors. If your steering wheel shakes, then its probably a rotor in the front. If your brake pedal shakes, then its probably in the rear.

 
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Ok, thanks Is this something that would be covered under warranty? If I take it to them, will they replace the affected rotors free of charge since it's a new vehicle?

 
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phuviano's got it right. But this topic has been covered maaany times before... including whether or not the dealer will cover it under warranty ( rotor resurfacing will likely be covered, but full rotor replacement is rare unless your dealer is ultra generous).

Try doing a search next time.