Unsual metal noise when braking,brake light comes on and sometimes the VDC and SLIP lights come on.I have to shut off the engine for a few seconds to clear it but it is re-occurring.i have a Nissan armada 2006

Quit guessing and have ABS codes read. Symptoms would be indicative of a bad wheel sensor which often fail with hub/CV failures.

Check the brake fluid level if it is low do not add. Check the front and rear brake pad if the pad are bad reinstall with a new and
the brake fluid return back to the fluid reservoir
and the system function and all the light on dash turn off

See if the following information helpful:
1. Keep an eye on the dashboard for the indicators marked "SLIP" and "VDC Off" which will tell you the status of the computerized handling system if handling isn't normal. "SLIP" will blink when VDC is operating. "VDC OFF" means the system is off. Turn the VDC system back on if the Nissan's handling is poor by pressing the "VDC Off" button until the light goes out.

2. Adjust your driving if "SLIP" comes on. "SLIP" means the road conditions may be slippery. The VDC aids in steering and stopping, but be careful, even if VDC is engaged.

3. Remove any aftermarket suspension parts like enhanced shock absorbers if the "VDC Off" light comes on and handling is bad. The VDC system is geared for stock equipment and tires only. Use winter tires or snow chains on snow-covered roads. VDC won't substitute for the correct winter equipment.

4. Don't drive on very inclined corners with high banks and leave the VDC switch on if the handling is poor with VDC on. The system can't operate properly in that environment. Disengage VDC, or avoid those kinds of roads.

I have a 2005 Nissan Pathfinder, the VDC light and the "Slip" light came on the dash, and the slip light was coming on while i was driving at the speed of 20 mph

Had the same problem ****** slips, had to rebuild transmission.

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.

Check brake fluid level, add fluid from sealed container if needed.

Also check for leaking rear axle seals. Look for oil on the inside of rear wheels.

if this sounds like a grinding or grating noise its likly to be worn out disk pads it sounds like metal on metal,,,,if the noise is a squeaking sound when you lightly tuch the brakes then its likly to be dry disk pads they need a spot of copper ease grees on the back of the pads to stop this noise,,wip them out and grees them,,,only on the backs!

I would take the car to almost any auto parts store and ask them to check the ODB II computer for codes and to reset the "Check engine light". Get the code that they tell you and it should go a long way to pointing you in the right direction to fixing this problem. It might also be that when you pumped the brakes that you somehow set a code in the computer from the ABS system and now that you have the brakes pumped up and working correctly resetting the Check engine light might fix your problem.

Good luck! Write back with any code you get and I'll see if I can help you figure out what the problem might be.

I found your answer here:

Why Does the SLIP Light Come on?
The SLIP light represents the vehicle's traction control program. When illumiated it takes over control of throttle and braking based on input from a myriad of sensors. The VDC (traction control) is initiated by wheel slip, yaw and any other factors that make the computer think you're on the verge of loosing control of the vehicle. There have been a lot of complaints about the G35's VDC being too interferring and actually causing harder driving conditions. The VDC can be turned off via a switch to the lower left of the steering wheel (useful if trying to pull out of a snowy spot when wheel spin is necessary, or "spirited" accelerating). Even with the VDC turned off, however, it will still kick in if it detects substantial loss of control. NOTE: if you plan on racing, turn the VDC off. Otherwise it will ****** the throttle when you chirp the wheels from 1st to 2nd gear.