Drilled Rotors

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Reverted User:AdamS's capitalising of the 'A glowing disc brake' caption because, since headings aren't supposed to have other than initial caps, so should picture captions. —Morven 10:03, 21 May 2004 (UTC)

Motorbikes

This page is awfull there is almost no mention whatso ever of motorcycle disk brakes, which are completly diffrent from car ones. There is also next to no mention of the matreials used or their structure ect, sorry but this page is poor and almost useless. someone sort it out.

Full-Circle/Annular brakes?

User:24.21.241.47 added a large discussion of "full circle" disc brakes including a single external link to a company that makes (?) them. Sounds like a real technology, but has never been mentioned by autoweek or ward's. Google didn't have anything like it in the top 10 in a search for '"full circle" brake'. I've never heard of it. I removed it. What do you all think? Reminds me of Quasiturbine... --SFoskett 03:13, Jan 28, 2005 (UTC)

they're called "full contact disc brakes" http://www.newtechbrake.com/ http://www.carbibles.com/brake_bible.html

Wasn't that in PM or PopSci a few yrs ago, a spl ish on "future car" tech? (Anybody remember what ish that was?!) Trekphiler 17:38, 21 August 2007 (UTC)

In wheels?

The picture caption states "On automobiles, disc brakes are located within the wheel". Is that always the case? Doesn't Jaguar use a rear axis where the discs are located almost at the differential? // Liftarn

Recent additions

Do some of the recent additions/changes seem a bit dodgy to anyone else? At a minimum, there's now grammar cleanup that's needed, and I'm not sure I agree with the technical accuracy of some of the changes.

Atlant 20:28, 7 September 2005 (UTC)

fudu —Preceding unsigned comment added by 125.62.117.238 (talk) 11:16, 18 October 2009 (UTC)

Concerns about runout

I'm new here, so I was hestiant to make changes myself, but I agree. Particularly, the setench about how .007 inch thickness variation can be felt - this is entirely dependant on the rest of the braking system. I was going to change it to this:

The thickness variation can often be felt by the driver when it approaches or exceeds the maximum allowable value specified by the manufacturer.

but thought I should get some feedback here first, seeing as I'm new :)

--Emesis 16:08, 19 March 2006 (UTC)

Disc Brakes on Bicycle

There is a lot of inforation about disc brakes ane how they are used for motorised vehicles (e.g. cars), but how about disc brakes used on bicycles, because surely they are not the same.

Bicycle disc brakes work in an identical way to cars, in that they all have a master cylinder, a disc (known as a rotor on a bike) and a caliper, interconnected by brake fluid, which operates the pistons. The main difference is the mounting and the overall size and weight of the brake. The bicycles' rotor is mounted on the wheel therefore making it easier to replace the brake pads. Also, the brakes are considerably lighter, approximately 300 grams for each brake, although this excludes the rotors. The size of the rotors also differ, from 140mm to 225mm in diameter. The brakes are not vented either unlike a car that has effectively two rotors attached with a gap in between, although new brake designs are being released by the likes of Hope Technology, which are vented. All bike rotors are cross-drilled, reducing the build up of gasses which can affect braking performance, and it also helps to keep both the pads and the rotor cooler, by increasing the surfac area they have to cool down.

Cross Drilling

Why do my edits regarding cross drilling keep getting removed!

The drilling of discs is to remove/vent high temperature gases from the brake pad/disc surface. They also increase the discs surface area allowing more heat to transfer to the atmosphere.

Any effect on unsprung mass is negligible/incidental. They do not 'in the main crack', this is dependant on use and manufacturing quality.

"Manufacturers use drilled discs if they determine that the average owner of the vehicle model will not overly stress them"

Is that suggesting that manufacturers send out marginally safe vehicles based on an estimate of the owners driving style?

This article is grossly inaccurate, I am a highly qualified vehicle engineer with nearly 25 years experience in the industry.

Might I ask what qualifications the author of these half baked opinions holds?

I added some information about cross-drilled rotors under the "Discs" subsection. I'd like to add something somewhere that brakes work by converting the car's kinetic energy to thermal energy; a dramatic illustration of this can be seen here: http://img.photobucket.com/albums/v306/RiddleFox/cars/RedHotBrembos.jpg Just not so sure where. Riddlefox 21:03, 6 April 2006 (UTC)

What's that nonsense about "heat dissipation"? Cross-drilling does not improve heat disssipation. Quite the opposite, disk brakes with cross-drilled disks are more prone to overheating due to lower contact area and, consequently, higher heat accumulation in the pad.

Bedding Rotors to reduce Squeal

Pad and rotor bedding procedures are often overlooked by drivers. In performance automobiles, properly bedding new pads in old rotors is essential for performance, comfort and squeal reduction. Is it appropriate to add a procedure to the article? Wpjonathan 13:27, 11 April 2006 (UTC)

Brake repair and maintence

Having recently shelled out ~$90 to replace a "brake switch" I'd like to see more general information on the parts that go into the brakes and how to replace/repair them. So if someone could add a section for this, that'd be nice. Also, after poking around a bit most places seem to have "brake light switches" for about $3 and they go into the main fuse box under my hood...takes a good 3-4 seconds to replace it. Am I getting hosed on this deal or is the "brake switch" something different? -Anon 12:33, 2 May 2006 (CST)

Early History

Crosley's '49-50 discs were not "a type of" but true modern discs: http://www.ggw.org/~cac/Images/Misc/DiscBrakes-Sm.JPG Examination via a '35-53 MOTOR manual diagram further proves this fact. The apologetic wording "type of" needs to be stricken. Sorry, Jag. Imperial's '49-53 disc brakes should by right be mentioned, though those DO fit the billing of being "a type of", as they were fully enclosed with dual expanding full-circle pressure plates. WQ59B 03:02, 16 June 2006 (UTC)

yes but they were fixed brakes that also floated, they were fixed directally on but relied on one piston contacting the rotor first then pulling the other one in... believe me that was my uni thesis for engineering science. So yes they were the first "modern brakes" however they were not under the general specification headdings and so are not recognised.

Pad retraction?

• How do the brake pads retract after application - are springs or negative hydraulic pressure used? What stops the brakes staying "on"? 59.167.41.84 06:46, 8 December 2006 (UTC)

DTV?

One of the sections near the end makes reference to the acronym 'DTV' but it's not readily apparent what this is. Either I'm blind or the article could use a bit explaining it :) Ayocee 16:41, 27 April 2007 (UTC)

Liquid cooled disc brakes

One of my friends has developed a liquid cooled disc brake ("liquid cooled drive line" I think is the official description) called the "D-Brake." It attaches to the tail end of the vehicle's transmission and applies braking force to the drive shaft. Is this technology worth noting in the article? I don't know if this is the first of its kind or not, but I have detailed information available should it be deemed noteworthy. --Jack 22:27, 3 September 2007 (UTC)

Use on trains

This article completely overlooks the use of disc brakes on modern passenger trains a "hole" that needs to be filled by an expert in the field. Peter Horn 14:23, 26 March 2008 (UTC)

Picture of carbon disc brakes from the Concorde airliner?

The article on the Concorde uses a picture of its disc brakes, which are made out of carbon because of the high temperatures they must withstand when stopping a nearly-200 ton airliner. Would it be useful to put that picture in this article? Ilikefood (talk) 17:43, 28 August 2009 (UTC)

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