When I scanned for codes there weren’t any. There was originally a right front wheel speed sensor circuit malfunction code (C0040). I cleared that code last weekend when I installed the new sensor. I drove the truck approximately 100 miles last week then swapped the hub. I then checked for any abs code and there was not one present. I drove the truck maybe 10 miles yesterday to see it the light would clear but it did not. I wonder if that was not enough. The light came one last weekend as soon as I hit the brake pedal to pump up the brakes after compressing the brake caliper. It comes on as soon as you start the truck it never went away. No new code ever appeared. When I scan it, it shows no code currently.
please clarify if there is only "service brakes" message or ABS light on AND "service brakes" message.
no abs light denotes a different condition.
1. brake fluid level sensor bad
2. prop valve stuck
even a tech2 would only show" service brake ill yes/no" in the readout for this condition
if there is no ABS light on then try unplugging the brake fluid sensor
the service brakes message should go away, this would confirm the 2 possibilities above
if then testing the brake fluid sensor operation or replacing the brake fluid sensor does not correct the issue try doing several emergency stops over a few days, preferably on gravel, this can possibly un-stick the prop valve and correct the issue.
my 03 prop valve got stuck doing the same thing, in my case I had just finished doing the brakes and I had forgot to pump the brake pedal and drove off then realizing I had no brakes I stomped on the pedal, this caused a immediate "service brakes" condition.
after digging around the internet quit a bit I found the above information to be accurate and confirmed with my tech2, I did a number of emergency stops over a couple days and on the 3rd day when I started it up the message was gone
now i make sure to slowly give it pedal after doing brakes until they are pumped back up.