Firm brake pedal with engine off - vacuum leak?
Posted: Mon Aug 27, 2012 11:26 am
As the title says my brake pedal is firm without the engine running. It softens to normal within a second or two of starting the engine, and while shutting the engine off I can feel it become firm and tries to raise back up within a second or two.
Otherwise, braking behavior is normal save for a small sample of incidents where the pedal was very slightly firm when initially pressed, but felt normal by the time the pads really started to bite the rotors.
From similar symptoms online, it seems like a vacuum leak, but I can't find much in the way of Nissan- or Pathfinder-specific info.
Any thoughts? Any known failing parts?
Thanks.
Otherwise, braking behavior is normal save for a small sample of incidents where the pedal was very slightly firm when initially pressed, but felt normal by the time the pads really started to bite the rotors.
From similar symptoms online, it seems like a vacuum leak, but I can't find much in the way of Nissan- or Pathfinder-specific info.
Any thoughts? Any known failing parts?
Thanks.