Hissing brakes, low idle when brakes are pushed, hard to push down brake

SOURCE: Brake Light

The hole in the pedal arm is for the cruise control. There is a plastic plug that needs to be in place to turn off the brake lights. They should be available at any dealer - there is also one for the clutch pedal arm in manual trans. These are required for the cruise as well as to turn off the brake lights. I bet that several will now be able to have their cruise back.

SOURCE: brake fluid leaking out the back left tire area

you a have blown wheel cylinder replace it and the brake shoes bleed the system and your good to go

SOURCE: 2006 Nissan Pathfinder - VDC

While it is possible the brake cylinder needs replacing
I would be suspect of what a dealer tells you

If your bold enough to walk into the dealer service
bay from outside and talk to the tech that worked on
it,that would be where to start.

The VDC etc should be diagnosed with the proper
test equipment,scan tool etc.

I would talk to the tech,then go to a local repair
shop and spend some time explaining all the
issues,& make it clear your there only to work on
the Braking Electronics,no other checks or service
of any kind.