I'm getting noises from my ABS unit, usually on start up. Lasts about 30 seconds and I can feel pulsation/vibration on one of the lines on the top of the unit.

I had very few miles driven before i did a caliper swap (stock0 and bled the brakes back in.

I'm not sure if i somehow pulled a bubble into the ABS or if my caliper work was just a coincidence.

How difficult is it to bleed the ABS?

is there some other ABS issue i should be looking into?

Is there further info I should gather to better diagnose the problem?

 

so can anyone point me to a "how to" for bleeding the ABS?

 

Oh additionally. When my ABS system starts making this cavitation noise I've felt pulsation on this tube.

 

I replaced a leaking hose from the accumulator and took the car to a local dealer for bleeding. They couldn't get a bleed completed and trouble shot to the Trac pump. I'll be pulling the parts car pump. That car hasn't run in a while so I'll try to get started and make sure I don't get a trac pump light from that car. If good I'll swap it out. Bleeding could be an issue.