Editing Disc brake (section)

===Bicycles===
{{See also|Bicycle brake#Disc brakes}}
[[File:BrakeDiskVR.JPG|left|thumb|[[Mountain bike]] front disc brake]]
[[File:Santa Cruz 2013 Tallboy Al 11.jpg|thumb|upright|Rear disc brake caliper and disc on a mountain bike]]

[[Bicycle|Bike]] disc brakes may range from simple, mechanical (cable) systems, to expensive and powerful, multi-piston hydraulic disc systems, commonly used on [[Downhill mountain biking|downhill racing bikes]]. Improved technology has seen the creation of vented discs for use on [[Mountain bike|mountain bikes]], similar to those on cars, introduced to help avoid [[Brake fade|heat fade]] on fast alpine descents. Discs are also used on [[Road bicycle|road bicycles]] for all-weather cycling with predictable braking. By 2024, almost all road bikes are equipped with disc brakes, just like Mountain bikes. Drums are sometimes preferred as harder to damage in crowded parking, where discs are sometimes bent. Most bicycle brake discs are made of steel. Stainless steel is preferred due to its anti-rust properties.<ref>{{cite book|title=Sutherland's Handbook for Bicycle Mechanics Chapter 11 - Brakes |first=Howard |last=Sutherland |page=13 |year=2004 |edition=7th |publisher=Sutherland's Bicycle Shop Aids |url= http://www.sutherlandsbicycle.com/Chapter11.pdf |archive-url= https://web.archive.org/web/20131014223452/http://www.sutherlandsbicycle.com/Chapter11.pdf |archive-date=14 October 2013 |access-date=15 February 2015}}</ref> Discs are thin, often about 2&nbsp;mm. Some use a two-piece floating disc style, others use a one-piece solid metal disc. Bicycle disc brakes use either a two-piston caliper that clamps the disc from both sides or a single-piston caliper with one moving pad that contacts the disc first, and then pushes the disc against the non-moving pad.<ref>{{cite web |title=Mechanical Road Disc Brake Roundup |work=Gravelbike |date=10 September 2016 |url=https://www.gravelbike.com/mechanical-road-disc-brake-roundup/ |access-date=2021-03-30 |language=en-US |archive-date=1 March 2021 |archive-url=https://web.archive.org/web/20210301100458/https://www.gravelbike.com/mechanical-road-disc-brake-roundup/ |url-status=dead }}</ref> Because energy efficiency is so important in bicycles, an uncommon feature of bicycle brakes is that the pads retract to eliminate residual drag when the brake is released.{{Clarify|date=May 2017|reason=Don't brake pads retract slightly for all types of disc brakes?}} In contrast, most other brakes drag the pads lightly when released to minimize initial operational travel.{{Clarify|date=May 2017|reason=Brake pads usually drag slightly in other applications?}}