1999 Ford F150 XLT 5.3 Triton 159,XXX, auto trans, 4X4, front disc/rear drum.
Having an issue with brakes grabbing aggressively with minimal pedal application doing about 5mph at the end of the driveway. I've only noticed this less than ten times on the road.
I don't have any trouble codes but the ABS light goes on after a few pumps of the pedal only while in motion. i checked all the fittings/sensors to make sure there were no loose connections. The previous owner replaced multiple lines & never bled the system.
I was getting alot of noise due to low quality pads, replaced them & went through the front brakes cleaning/lubing parts properly. I didn't bleed the ABS unit but as for the rest of the system, I replaced all the fluid with DOT 4 & bled all four corners.
Recently it has gotten worse, seemingly locking the front tire, again BARELY touching the pedal. It almost feels as if the right front is causing it although there is no pulling of the wheel when this happens or with any brake application. I checked to see if the pistols were sticking, they seem fine.
I've noticed a hollow contact sound that can only be described as something inside scraping the inside if a steel wheel or a drum brake part scraping the interior of the drum along with what sometimes sounds like a wheel bearing, all sounds emanating from right front.
Any ideas on what could be wrong? I know the front axle halves are on the way out as the boots have split & keep the fender wells coated in oil. I'm not sure if those could be of any relation, but thought there could be some correlation with the vibrations caused.