I have a 99 Ford F250 with a Hydroboost system. The pedal kicks back at me when making quick presses of the brake. I am told that is from contamination or varnish around the spool valve inside the Hydroboost. I have changed all of my hoses and flushed the system twice and installed a Magnefine filter, but still have kickback. Is the Trans Tune product what I should use to try to remove varnish from the system? Any advice?