Brakes scrub, fail intermittently when vehicle cold. ABS light on intermittently.

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When I begin to drive my suv the brakes will scrub and seem to fail. It does stop it feels like the brakes are not catching. After this happens there is no problem with them again until the next time I drive the vehicle. This happens intermittenly. It happened once after I went through a large water puddle. My ABS light comes on intermittently also. I took it in for repair and the mechanic said he could find nothing wrong with my brakes and of course when he drove it this did not happen.