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Message: <blockquote data-quote="Richard L" data-source="post: 537851" data-attributes="member: 52972">Perhaps a damaged ABS Sensor, or perhaps the pulse ring is dirty, or not the correct type for the Sport Trac?  However, I think either would make your brake slip?I'm thinking that Todd may be on the right track.  The pads can be sticking or installed incorrectly.  The rotor may not have been cleaned properly and has some grease or a protective coating that was not removed.It's also possible that your caliper bores have some corrosion that is causing the pads to stick and engage unevenly.  This could explain why heavy braking does not cause a problem while the caliper sticks only during light braking.The sticking caliper is caused when the piston bore gets rusted or corroded and the pitting causes the piston to stick.  This is most noticable after new pads are installed because the pitting is caused by the fluid behind the pistons.  When new brake pads are installed the oisons are pushed back in to allow for the thicker new pads.  Now the spiston are riding over the pitted part of the bore that used to be behind the piston.Also, If you just pushed the pistons back into the caliper bores without releasing the bleed screw, you pushed the dirty contaminated fluid back into the ABS unit and may have clogged up something or caused the ABS unit to malfunction?  You should never push the pistons back into the bores without opening the bleed screw to avoid pushing the contaminated fluid back into the ABS and/or Master Cylinder....Rich</blockquote>

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