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- From: shadow@pro-haven.cts.com (Blaine Hufnagle)
- Newsgroups: rec.autos.tech
- Subject: Re: what larges vehicles use for brakes (was: disk brakes again)
- Message-ID: <ia85428@pro-haven.cts.com>
- Date: 11 Sep 92 04:26:46 GMT
- References: <1992Sep11.020550.28190@julian.uwo.ca>
- Sender: usenet@ucbvax.BERKELEY.EDU
- Organization: ProLine [pro-haven] - Pariahs' Haven BBS, 409/693-8262, 9600-300
- Lines: 29
-
- In <1992Sep11.020550.28190@julian.uwo.ca>
-
- % -> what do planes, trains, semi-trucks (ie MAC trucks/16 wheelers/tractor-
- % trailers) use for brakes?
-
- Planes use Disk brakes. ( I think.) pretty damn big disks. :)
-
- Normal freight trains use pseudo-drum brakes, as the shoes apply directly
- against the rolling surface. Look at a freight car some time when you are
- sitting at a RR crossing some time.
-
- Amtrak trains use very L A R G E disk brakes. (Somewhere in the
- neighboorhood of about 30 inchers.)
-
- Semi trucks and busses use hefty drum brakes. The drums usually run about 20
- inches in diameter, with the swept area being about 7 inches wide. The shoes
- are H U G E. The brakes are actuated by air pressure via an "S"-cam. They
- can usually stop said vehicle in nothing flat. The problem with them is that
- they lock up at the drop of a hat. If the driver can keep the wheels
- unlocked, in effective braking, most large vehicles like that can stop within
- 250-300 feet. And that's stopping anywhere from 36,000 lbs to 80,000 lbs.
-
- -blaine
-
- -blaine a.k.a. The Midnight Shadow | 1979 Chevy Urban Assault Vehicle
- Texas Aggie Bus Driver and proud of it! | 1982 Thomas Transit Liner bus
- Another Bodybuilder from HELL!! | 1982 Yamaha Vision DoD #7192
- "Mine is not to wonder why, Mine is but to look and cry....."
-
-