I am having a horrible grinding sound and vibration in my brake pedal and i can sometimes feel it in my steering wheel while turning. My ABS and Trac Off lights keep coming on as well. I got the left front cv axle replaced and its not the wheel bearings. I really need to know what to look for cuz all of the "mechanics" out there are telling me something different.

I really hate these questions

How do different mechanics come up with
different ideas.

They either talk the talk and test nothing
or you leave with no solution & I ask why?

Have you left the car long enough with specific
directions, as to what was to be done and nothing else ?

If so, then we have a lot of incompetent folks in the wrong
line of work

I have no idea what your issues are

But you have ABS & Trac lights on, and just had a CV axle
replaced. That give me a bad feeling that the ABS Sensor
was damaged

Take this with some doubt,but mechanics just can not
put down the air guns. They could very well have ruined ,
what were good wheel bearings, doing your axle

The ABS issues are part of your vibration & unless you
know all about the condition of your brake rotors and pads
and all the possible years of accumulated rust going on there,
that is more to look at.

Grinding sound ? May be worn brake pads, down to the metal against the rotors. Vibration, could be a warped rotor, wheels not balanced, worn outter tie rods. The ABS light will come on if the tooth ring is broken, giving you a pulsing pedal. That is what the ABS does.