Changed the bake pads, and recently the brake line on my 2008 Nissan Armada. But the VDC, Slip, and Brake light is still on and when the brake is depressed I have to either pump them to get the brake

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.

Error Code: P0335
Description:
Crankshaft Position (CKP) Sensor - Circuit Malfunction
Possible Cause:
Wiring.
Crankshaft position (CKP) sensor.
Engine control module (ECM).

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.

does the master cylinder have enough brake fluid in it, low fluid level commonly causes those two lights to come on you may wanna check your brake fluid level.

Sounds like it time to do the brake pads. That is the most likeliest to be the problem. If you have done the brakes it is possible that the clips that holds the pad in place might have slipped or the anti squeal mechanism is hitting the this rotor when the brakes are applied. PLEASE CHECK THEM OUT BEFORE DRIVING THIS VEHICLE COULD RESULT IN A DEADLY CRASH!

VDC/ OFF light is still ON only ? or also SLIP + VDC/OFF ?

if VDC/OFF only u must check ur brake fluid status if both VDC and SLIP u still have problems with ur ABS module and steering wheel

Take off wheel, brake caliper, pull brake disk. It houses the parking brake (drum type). Chances are the parking breke shoes are shot.