Quote:
Originally Posted by Bad Luck
It's possible, but unlikely that changing brake pads would cause it to start leaking vacuum. You typically hear a whistle type noise when a brake booster doesn't fail completely. If the master cylinder was leaking into the booster the pedal would slowly fall when applied without vacuum in the booster. My bet is the rotors are gouged and the flat pads don't have a flat rotor to press against so all the brake pad material isn't in contact with all of the rotor.
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Good points. Cheap brake pads will make a hissing sound even on good rotors I've noticed. More on my bikes than cars but same thing. Some people equate it to cicada's making their unique noise.
