Hello Scotty, I have a 2008 Toyota Tundra sr5 4wd 5.7 engine crewmax with 170k miles. I am having a problem with the ABS system. everyonce in a while, im travelling at a normal speed 50 to 70 mph and when i let off the accel to slow down, I apply the brake and the pedal feels hard, so i apply more pressure to the brake pedal and it sinks down faster than usual with a vibration(abs working im guessing) until the pedal sinks. with this i hear a whine ( starts loud then lowers and disappears with abs) and the the truck eventually stops HARD. i then have ABS, Brake and VSC lights on dash. i keep driving and the truck functions and brakes normal like nothing happened but lights stay on. i have to shut off and restart truck for lights to disappear. i have taken it to toyota mechanic and they can figure it out. they tried a recalibration of some sort. didnt change anything. i changed out ABS sensors to no avail. i have 1" concentric wheel spacers on the wheels, would this make a difference. im also thinking it coyld be as simple as the brake booster, i also replaced and bled out all brake fluid in the brake system from fill reservior to each caliper.. Help please! by the way, ive been a fan for a few years now, your awesome bro!