Subject: Re: Pads, Rotors et all by BillH on 2009/3/30 13:46:40
Quote:
CentralCoaster wrote:
Yes, and let me reiterate, DO NOT COME TO A COMPLETE STOP. Find a place where you can either let the car coast awhile for them to cool before stopping, or else a place where you can get home without any stoplights.
On my 85 I even used the parking brake to drive home to avoid using the front brakes.
If you come to a complete stop on hot brakes you can heat check the rotor. If it doesn't damage them it will at least make them look terrible. Heat checking on my wilwoods left pad marks for a long time before they finally wore past.
Yep, don't stop. That's why most vendor's instructions say 60mph down to 10 mph. We do even more at the racetrack. I usually take my car and bed in 3 sets of pads on the first test day so I have them in the trailer. When the car comes in from the cooldown lap, it immeadiately goes up in the air. We walk by the wheels and spin then a quarter turn until the rotors get close to ambient.
The heat checking that CC & Dan mentioned can easily happen. One other thing that happens with a hot rotor that sits for a while (longer than a traffic light)is that some of the adherent layer on the rotor will stick to the pad so, the next time the rotor spins, the adherent layer has a different thickness at that spot. The difference in thickness causes the pedal vibration and the difference takes quite a while to wear down because street brakes aren't used very hard.
