Originally Posted by
katie
check your proportioning valve located just under the resivour. it may need replaced
that has nothing to do with it.
if you are experiencing a stiff brake pedal and are hearing what sounds like a vacuum leak then you have a brake booster that has a defective diaphram. hence the vacuum leak. it kinda hard to properly diagnose your problem with out seeing the vehicle. does it make any noise at all if you do not depress the brake pedal? is the noise constant when your foot is on the brake?