Brake Grinding Noise problems of the 2006 Suzuki Grand Vitara

Brake pedal goes almost all the way to the floor before engaging and at times there is a grinding noise from the front of the vehicle. When I took it to get the brakes checked, the pads were fine, but one of the calipers was misaligned. When I took the Suzuki Grand Vitara in to get the recalled power steering tensioner pulley replaced, and for servicing, they loaned me a vehicle. I almost went though the windshield with the functional brakes of the loaner, actually any brakes on any other vehicle I drive. It almost feels as if the brake pedal will go all the way to the floor. I have had to use my automatic transmission gears to slow the vehicle down. Brake shoes, pads whatever they are called are fine. The dealership doesn't think that safety is a concern. Also, I might add that the replaced power steering tensioner pulley now creates a severe knocking noise in the engine (that did not exist prior to the replacement). I have returned to the dealer 4 times to repair . . . Apparently, Suzuki has also issued another technical bulletin to decrease the knocking, but it is still there!.