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Pedal pulsation caused by drum warpage isn't as common, but it can happen. A drum can sometimes be warped out-of-round by applying the parking brake when the brakes are hot. As the drum cools, the force of the shoes causes the drum to distort.
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autos.yahoo.com/maintain/repairqa/brakes/ques003_3.html
autos.yahoo.com/maintain/repairqa/brakes/ques003_3.html
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Q. What causes rotor warping (a.k.a. pulsating brakes)? A. The term ?warped rotors? is commonly used to describe brake pulsation, but the rotor is not actually warping at high temperature so the term ?warped rotors?
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www.powerstop.com/content.wws?fname=technicalfaq.html
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Many people complain about brake pulsation and warped rotors. This guide is meant to help understand why you get brake judder and what you can do to prevent it. ... So the spots become elevated above the rotor surface, and you start to feel brake pulsation. You can try to turn down the rotor, but the cementite nodule is...
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reviews.ebay.com/What-causes-rotor-warping_W0QQugidZ100...
reviews.ebay.com/What-causes-rotor-warping_W0QQugidZ10000000005242298
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One of the most common brake system customer vehicle performance complaints is brake roughness, pulsation and vibration. As common as this complaint is very few people, including many service technicians, actually understand the true cause of it and what to do ... This in-and-out pad motion causes a varying brake force,
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www.performanceoiltechnology.com/brakingsystems.htm
www.performanceoiltechnology.com/brakingsystems.htm
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Brake pulsation, then, is generally caused by a disc that is no longer smooth, flat, or straight. It usually begins with excessive lateral runout or side to side movement of the brake disc as it rotates.
http://www.stationgarageltd.com/brake_skimming.html
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[Archive] Front Disc Brake Pulsation #00-05-23-002B - (03/05/2003) Warranty, TSB and Recall Info ... This specification is important to prevent comebacks for brake pulsation and is a tighter specification than specified for other vehicle models. GM has approved a new technology for the correction of lateral run-out on new...
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www.grandamgt.com/forum/archive/index.php/t-11355.html
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The drum brake pulsation is an issue that may cause a major customer complaint. One of the root causes of the drum pulsation is the deformation of the drum to an out-of-roundness (OOR) shape during the wheel-drum-axle assembly process under the presence of the uneven wheel flatness.
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www.sae.org/technical/papers/2008-01-0825
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Brake pulsation has become a common concern on many newer vehicles. The vehicle stops smoothly when new, but after a few thousand kilometres the brake pedal starts to pulsate when stopping, the brakes feel ... Heavier rotors also tend to be more stable, so they seldom warp, which is one of the causes of brake pulsation.
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www.canadiandriver.com/2002/01/08/auto-tech-why-brake-p...
www.canadiandriver.com/2002/01/08/auto-tech-why-brake-pulsations-happen.htm
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Lateral run-out, caused by stacked tolerances, is now recognised as the number one cause of rotor thickness variation that in turn causes brake pedal pulsation.
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issuu.com/repco/docs/brake_lathes
issuu.com/repco/docs/brake_lathes
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