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[quote][i]Originally posted by Steve[/i] Heres some more reading for you http://www.examiner.com/auto-in-orlando/there-s-no-such-thing-as-warped-brake-rotors There's no such thing as 'warped' brake rotorsJuly 10th, 2009 1:11 am ET . Red-hot brakes/courtesy of siemens.com For as long as the disc brake setup has existed, drivers who report a brake vibration or pulsation during high-speed braking (such as exiting a highway) have brought their vehicles into a service station and been told the rotors are 'warped.' The consensus is that if the brakes get hot enough during service, the rotors warp under the heat and variations in their thickness occur. The belief is that as the pads ride over these undulations, the braking power rapidly increases and decreases, causing a vibrating or pulsating sensation. The remedy for 'warped' rotors is to grind them down and resurface them to restore a uniform surface and smooth out the brakes. However, badly 'warped' rotors frequently repeat their vibrating in a short period of time, and are then completely replaced to eliminate the problem for good. Well, the truth is, brake rotors do not warp at all, and a simple recommendation can save you a lot of money at your next brake services and the future ones to follow. According to this magnificent article from StopTech, the cause of brake vibrations or shimmies is the result of uneven transfer of brake pad material to the rotor, thus causing the variations in the rotor surface. Standard road cars use brakes that function mostly by abrasion, or the breaking down of the bonds between the pad material molecules by the friction generated by pushing the pads against the rotors. Under normal city conditions, the worn-away pad material is simply carried away as brake dust (the black dust commonly seen on wheels). However, under heavier braking, such as an emergency stop or slowing down from a highway exit, the brakes become much hotter, and that material can actually 'cook' to the brake rotors. The best way to aid in this 'cooking' process is to keep the pads in constant pressurized contact with the rotors... by remaining firmly on the brakes after the vehicle has come to a complete stop. As the pad material bonds to the rotor, the surface of the rotor then becomes uneven, and the brakes begin to vibrate at high speeds. The brake rotors do not warp, however. Even the most extreme braking conditions on public roads do not generate enough heat to cause the brake rotors to warp. In reading the StopTech article and following its advice, I have safely avoided ever 'warping' rotors or experiencing any brake vibrations in over 100,000 miles of driving in many different vehicles. To euphemize this as best as possible... I'm not exactly the slowest driver in the world. As a result of my driving style, I wear out two automotive components far more quickly than the average driver: tires and brake pads. For example, a vehicle I used to drive a few years ago once needed brake pads at only 18,000 miles. However, that vehicle's rotors were in pristine condition at the time of the brake service, having no inconsistencies in thickness or braking surfaces, thus requiring no resurfacing. On another occasion, I wore down a different vehicle's brake rotors to the point where a ¼-inch deep valley was formed in the rotor by several sets of brake pads. The rotors of course had served their purpose and needed replacement, but the brakes never shimmied or pulsated at any time. I've also done numerous premature brake jobs on my personal vehicles, not just as a result of my lead foot, but because of a few autocrosses and rallycrosses along the way. But not once have I needed to replace or resurface rotors. I follow this one simple rule to avoid brake vibrations: when I come to a hard stop, I immediately release the brakes completely as soon as the car is stopped. I even go so far as to take the vehicle out of gear to ensure that it does not move when I release the brakes. This disallows the brake pads to transfer the worn material onto the rotor. Now, as the StopTech article points out, rotors that are already heavily embedded with pad material, and thus full of vibrations, are likely ruined. The 'cooked'-on pad material is called cementite, and it is pretty much permanent, where no amount of resurfacing can remove it. So, if you're currently driving a vehicle with excessive brake vibrations, simply have the rotors replaced at your next brake service, and follow the rule of releasing the brakes completely after a hard stop from then on. By doing so, only your brake pads will require replacing at your next brake service, thus saving you time and a lot of money. [/quote]
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