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ABS is for absolutely brain dead stops.....if you need to stop, MASH THE PEDAL TO THE FLOOR and it'll do all the work for you.
ABS is basicly made up of 2 systems: a wheel speed sensor and a very fast brake pump. The wheel speed sensors tell when the wheels are stopping spinnning too fast, meaning that they aren't gripping the road, and they make the brakes release so the tires can grab back grip, and then the brake reengages. This happens until the car stop completely The number of "channels" some ABS systems advertise simply means how many wheel sensors are there. 4 channel systems will detect the speed of each wheel independently and release and reengage each wheel's brake accordingly. 3 channel ones have independent front sensors and a linked rear sensor, so if one wheel slips in the back, both brakes will release.
on icy roads, no matter how little you brake u're likely to lock the tires. And when you lock them, you lose all directional control. You did the right thing by letting up on the brake and letting the tires divert all of the available traction to keeping control of the car.
theoretically ABS will give you the shortest distance in any condition. This generally holds true, except for when driving in loose traction conditions like dirt or deep snow, in which case the best way to stop is actually to lock all the wheels and let the snow/dirt build up in front of them, this will actually stop you faster.
addendum: because the wheels don't ever lock with ABS, you maintain some directional control with the brake mashed to the ground, which is why your brother said to just brake and steer. don't expect the car to be as agile as usual tho, and remember, every bit of traction diverted to steering the car in a different direction is traction taken away from stopping the car.
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