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	Vacuum brake - Wikipedia, the free encyclopedia
		Vacuum braking is for all practical purposes now a dead technology; it is not in large-scale use anywhere in the world, supplanted in the main by air brakes.
		The vacuum brake was considered preferential to the early air brake in railroad applications largely because it was cheaper to install on a steam locomotive.
		Vacuum brakes are not used on road vehicles because a continueous bleed of air is harder to maintain, also, there is not as much room for large diameter cylinders.
	en.wikipedia.org /wiki/Vacuum_brakes (1024 words)

	Vacuum Brakes (Site not responding. Last check: 2007-11-02)
		The vacuum in the brake pipe is prevented from exceeding its nominated level (normally 21 Hg) by a relief valve, which opens at the setting and lets air into the brake pipe to prevent further increase.
		The fall of the piston to the bottom of the brake cylinder causes the brake blocks to be released from the wheels.
		During the brake application, the vacuum in the brake pipe is reduced by admitting air from the atmosphere.
	www.railway-technical.com /vacuum.html (3140 words)

	Vacuum Brake Cylinders (Site not responding. Last check: 2007-11-02)
		When vacuum is created in the train-pipe, air passes freely from the bottom side of the piston, which will then fall by its own weight when an equal vacuum exists on both sides of it.
		When the brake is applied, air enters the bottom side of the cylinder from the train-pipe and presses down on the ball valve, thereby preserving the vacuum on the top side.
		The piston therefore rises due to the difference in vacuum and the brakes are applied.
	www.railcar.co.uk /mechanical/brakes/cylinder.htm (425 words)

	FMCSA - Regulation: 571.106
		Brake hose means a flexible conduit, other than a vacuum tubing connector, manufactured for use in a brake system to transmit or contain the fluid pressure or vacuum used to apply force to a vehicle's brakes.
		Brake hose assembly means a brake hose, with or without armor, equipped with end fittings for use in a brake system, but does not include an air or vacuum assembly prepared by the owner or operator of a used vehicle, by his/her employee, or by a repair facility, for installation in that used vehicle.
		Vacuum tubing connector means a flexible conduit of vacuum that (i) connects metal tubing to metal tubing in a brake system, (ii) is attached without end fittings, and (iii) when installed, has an unsupported length less than the total length of those portions that cover the metal tubing.
	www.fmcsa.dot.gov /rules-regulations/administration/fmcsr/571.106.htm (12625 words)

	Troubleshooting Power Brakes, Larry Carley
		Vacuum is good for a lot of things, like sucking gas through a carburetor, opening and closing airflow doors in a vehicle's climate control system, and for providing extra muscle for braking.
		Vacuum boosters also have an external one-way check valve at the hose inlet that closes when the engine is either shut off or stalls.
		Slow brake pedal return may be caused by excessive seal friction in the booster, faulty spool action or a restriction in the return line to the pump.
	www.aa1car.com /library/pwrsteer.htm (1904 words)

	Bleeding Motorcycle Brakes - webBikeWorld
		Moisture in your braking system is very dangerous, as water boils faster than brake fluid and can lead to serious problems with the braking performance of your bike.
		The container has a screw-on top which is airtight once sealed; the top has two nipples on it, one is for the hose that goes to the pump and the other is for the hose that goes to the bleed fitting.
		Brake fluid is supposed to be pretty corrosive stuff on paint jobs, so I always keep a spray bottle of non-ammonia window cleaner (e.g., "Glass Plus" brand) nearby and some paper towels to spray and clean up any brake fluid drips as quickly as possible.
	www.webbikeworld.com /Motorcycle-technical-articles/bleeding-motorcycle-brakes/bleeding-motorcycle-brakes.htm (2214 words)

	NASIOC - Vacuum brake bleed system
		The other issue with a vacuum bleeder is that tiny air bubbles are sucked in past the bleed valve threads when it's open, so there always seem to be some bubbles visible in the line out of the valve which makes it hard to tell when you're done bleeding...
		It depends on the velocity of the brake fluid in the line, the position where the air bubble is with the respect of the centerline of the tube, viscosity of the brake fluid, etc. Bottom line is you have a drag force and a bouyancy force acting on the bubble.
		When you close the bleeder valve after vacuum bleeding, what happens to the bubbles that are still adherant to the inside of the bleeder valve threads or the inside wall of the tapered, threaded hole in the caliper due to surface tension?
	forums.nasioc.com /forums/showthread.php?t=813453 (1778 words)

	Brake Booster Vacuum Pump (Site not responding. Last check: 2007-11-02)
		The diesel is thus equipped with a vacuum pump, which is driven by a single belt off of the alternator.
		The switch senses vacuum through a fitting in the vacuum manifold that intercepts the vacuum flow from the pump.
		The low vacuum switch is mounted on the right side of the engine compartment, adjacent to the vacuum pump on F-250 and F-350 models.
	aarc.epnet.com /application/8576/8576R09_Brake_Booster_Vacuum_Pump.htm (125 words)

	ABS Brake Bleed Procedure
		Bleeding can be performed manually with vacuum equipment or with pressure equipment If vacuum or pressure bleeding equipment is used, it is important that the manufactures instructions be followed for proper results.
		Vacuum bleeding does not require that the front brake metering valve be held open.
		However, if pressure equipment is used, it will be necessary to hold the front brake metering valve open in order to bleed the front brakes.
	dodgeram.org /tech/repair/Brakes/beeding.htm (1085 words)

	Vacuum Line Pump Brake Booster Mercedes Web-Page, Secrets And News (Site not responding. Last check: 2007-11-02)
		It was clear that the vacuum pump was fine, because the brakes had good boost, so I disconnected the hose at the t and connected the line.
		A normal dental vacuum pump is used for suctioning all day long in the typical dental office, and consumes between 30 60 gallons of water per hour, said Dr. As concerned members of the Colorado community, the doctors and staff at Comfort Dental recognize the urgency of water conservation in drought ravaged Colorado.
		These pumps are expected to be capable of reaching vacuum side pressures in the torr to millitorr range from 133 down to 0.13 Pa. This version is said to be micromachined because the two silicone layers containing the channels would be fabricated by casting silicone rubber on micromachined silicon molds.
	vacuum-pump-source.info /vacuum-line-pump-brake-booster-mercedes.html (1070 words)

	Automotive Engineering International Online: Tech Briefs, April 2000, Page 1
		Vehicular braking systems are either activated by the driver's effort on a hand lever or pedal, which is directly transmitted via a hydraulic link to the brake pad, or are partially or completely power assisted.
		Once the brake pedal is activated, the vacuum valve is closed and the air intake valve is opened in proportion to the displacement of the push rod.
		When the brake pedal is released, the spring moves the piston back, closing the air intake valve and opening the vacuum valve to rebalance the pressure between the two chambers.
	www.sae.org /automag/techbriefs_04-00/01.htm (677 words)

	brake booster vacuum sealer (Site not responding. Last check: 2007-11-02)
		Vacuum sealing or specifically brake booster vacuum sealer can not only save you time going to and from the market daily but it can save you money.
		As you continue your research on brake booster vacuum sealer you will find that there are number of home and commercial vacuum sealers on the market.
		We have been told that we are the greatest option of places on the world wide web for brake booster vacuum sealer, accessories for brake booster vacuum sealer, services for brake booster vacuum sealer, and all other needs involving or related to brake booster vacuum sealer.
	www.vacuumsealershere.com /brakeboostervacuumsealer (1066 words)

	AudiWorld Forums: Possibly a vacuum brake booster check valve is bad...
		The function of the check valve is to maintain a supply of vacuum in the brake booster for just such an occasion as you describe.
		Full throttle is lowest vacuum condition, and if you lift and brake hard immediately without vacuum reserve in the booster, you effectively have zero boost, and a rock hard pedal.
		"brake on, brake off, settle, turn in, throttle, turn out, exit"..that's only one method.
	forums.audiworld.com /tt/msgs/217806.phtml (554 words)

	Brake booster and vacuum - ShopForum (Site not responding. Last check: 2007-11-02)
		I have a vacuum tester, but I was under the impression I could only use it to test the vacuum system, and not the pump itself.
		There should be no flow of vacuum through the booster unless the pedal is pushed, thus if you check the vacuum at the source tee with the line hooked to the booster it should give the same reading as if you remove the line and put your finger over it and retest.
		A large drop in vacuum will result but should stabilize and pressure build if the pedal is held with constant force (not pumped - pumping will continue to deplete and exhaust till there is no more reservoir of vacuum).
	www.mercedesshop.com /shopforum/showthread.php3?t=8728 (346 words)

	Hydraulic brake booster or Vacuum brake booster ? - CK5 Forums
		I have a hydraulic brake booster on a K30 that i am parting out and was wondering if this was a better set up because i might swap it in my K5 smp
		As i understand it, the hydrolic set-up is superior to the vacuum.
		Vacuum is just so easy and only a few parts to maintain.
	www.coloradok5.com /forums/showthread.php?t=7077 (284 words)

	BD Engine Brake (Ford) (Site not responding. Last check: 2007-11-02)
		The brake incorporates BD’s exclusive Variable Orifice technology, where the spring loaded piston in the powerful 3" vacuum cylinder is compressed by the off set stainless steel butterfly once the peak retarding pressure is achieved.
		BD advises the driver that this “electronic” brake results in a extreme amount of delay or distance before retarding occurs; the amount of retarding force is 30% less than vacuum engaged BD vacuum engaged brake and 10% of the stock Ford heat riser valves that stick or bind.
		Exhaust brakes engage when you have your foot off of the accelerator pedal and this is when transmission pressures are the lowest.
	www.dieselpage.com /bdebf.htm (1710 words)

	Vacuum Brake Bleeder System
		This low dollar backyard vacuum pump was constructed for under $25.00 U.S. I use it to do a front fork oil change on Road King's and Dresser models, prior to the new cartridge H-D fork's.
		When all fork oil is gone pull the clear hose from the slider, vacuum is still on, this keeps the fork oil from coming back out the drain hole when you pull the hose.
		The pump provides the vacuum and the coffee can/soup jar serves as a reservoir to catch the access brake fluid being sucked through the brake system.
	www.bikernet.com /garage/vacbrake.asp (724 words)

	ALLDATA -- Jim Grant's Tech Tips -- Mazda 626, Morning Brake Sickness
		The brake pedal is hard, but if the car runs a few minutes it’s ok, (and this is a stiff, stiff pedal).
		In Vacuum Brake 101 the first diagnostic step is to step on the brake pedal several times before starting the engine.
		Vacuum should be checked at the engine and then compared to the vacuum supplied to the vacuum booster.
	www.alldata.com /techtips/2003/20030307c.html (359 words)

	Vacuum Brake Booster on The Jeep CJ3B Page (Site not responding. Last check: 2007-11-02)
		The braking is 50% better and I am planning to add 11" on the back axle as well.
		There is a fellow in Australia who modified his 3B braking system using a General Motors unit and said that he was quite pleased with it.
		It may be an alternative to 11" brake conversion or It may be a good idea to add to an 11" brake conversion as the dual master cylinder is a great safety feature.
	www.film.queensu.ca /CJ3B/Tech/BrakeBooster.html (590 words)

	Power Brake Assist Vacuum Pump
		This is not enough to evacuate (re-charge) the power brake vacuum boost cannister.
		To connect the pump to the existing vacuum hose, remove the hose from the booster (leave it attached to the intake manifold).
		If the engine stalls (manifold vacuum rises to ambient air pressure), and the key is still on, the pump provides all the vacuum.
	victorylibrary.com /mopar/pump-tech-c.htm (1524 words)

	Ram exhaust brake
		An exhaust brake uses a butterfly valve behind the turbocharger or in the exhaust pipe to restrict the flow of exhaust gas.
		The brake I have is the model that does not need the heavy valve springs so it really doesn't brake as much as the other Pacbrake or the Jacobs.
		He said that because the exhaust brake butterfly is so close to the outlet of the turbo, the exhaust flow is too turbulent (not to mention warm) to get an accurate pressure drop measurement.
	dodgeram.org /ki4cy/exhbrake/exh_brake.htm (3290 words)

	Adding a Vacuum Gauge (Site not responding. Last check: 2007-11-02)
		Because a gasoline engine sucks in the air/fuel mixture during an intake stroke, a vacuum is created in the intake manifold.
		While it sounds trivial, the amount of vacuum is excellent at relaying information about an engine's running efficiency and overall condition.
		On my pre-power brake petrol engine, there was an unused port on the intake manifold, rear of the carburettor, that was fitted with a threaded plug.
	www.seriesrover.com /series_tech/modification/vacuum_gauge.html (735 words)

	Hepa brake dust vacuum cleaner (Site not responding. Last check: 2007-11-02)
		Vacuum CleanerVacuum what is the best vacuum cleaner cleaner that will hepa brake dust vacuum cleaner allowed.
		what is douglas vacuum cleaners nothing I Learned From The vacuum cleaners, including tax outside the free shipping within vacuum cleaners wood floors 24 hours of its latest evolution in the Sebo vacuum cleaner is Bob, but.
		The included new vacuum cleaner spares and hepa brake dust vacuum cleaner cleaners, royal metal vacuums by Bill Hammack.
	vacuum-cleaner.hotonthenet.net /hepa-brake-dust-vacuum-cleaner.html (679 words)

	Powermaster To Vacuum Brake Conversion (Site not responding. Last check: 2007-11-02)
		I used a plastic 5/16 "T" to connect the vacuum between the vacuum port on the throttle body and the pvc valve.
		This is because you will likely never have anymore brake problems and will therefore totally forget all about what a powermaster is and the date will make you feel like it is ok to throw it in the rubbish.
		By the way, I am a very large man, 6-2 and 245 and the only 'tight spots were when putting the bolts in to the pedal and they were by far not the worst situation I have had under a dash.
	www.gnttype.org /techarea/brakes/Powermaster_to_vacuum.html (1278 words)

	Brake vacuum pump (Site not responding. Last check: 2007-11-02)
		This can be accomplished with a vacuum pump, reservoir, and switch connected to the car's original power brake unit.
		Vacuum brake, a kind of continuous brake operated by exhausting the air...
		Stick one end of a vacuum hose on the nipple of each bleed screw and the other end in a jar.
	4272.sfl13d.info (785 words)

	Vacuum brake booster for automobile - All Products for Vacuum brake booster for automobile Manufacturers and Suppliers ...
		Vacuum brake booster for automobile Manufacturers and Suppliers
		Here listed Vacuum brake booster for automobile manufacturer and Vacuum brake booster for automobile suppliers from Taiwan, China and worldwide market.
		If you did not satisied the Vacuum brake booster for automobile results, please fill out the form "Disstatisfied Results" to remind us to improve our service and creat more opportunities for you.
	www.allproducts.com /search/products/pT01020705.shtml (302 words)

	GN and T-Type Performance Enthusiasts (GNTTYPE) Forums - vacuum brake problem (Site not responding. Last check: 2007-11-02)
		The pedal takes a second to return to the relaxed position also, and seems to be dragging the brakes as it returns to neutral.
		I used a vacuum system pedal from the only g body I could find in a junk yard around here, It came out of a 305 86 cutlass.
		Also, I rebled the brakes and the left rear I continuously get air out of, all the others are fine just this one, I have run about a litre of fluid through it and still air.
	www.gnttype.org /forums/showthread.php?t=1853 (408 words)

	Craftsman 21021 Vacuum Pump/Brake Bleed Kit at Sears.com
		Kit allows one person to bleed Brake Fluid easily/cleanly.
		Vacuum pump alone can test vacuum operated sensors/components.
		Sealant lubricant to prevent brake fluid bubbles, 24 in.
	www.sears.com /sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=TOOL&pid=00921021000 (176 words)

	Vacuum Pump/Brake Bleed Kit CP7835
		Vacuum Pump alone can test vacuum operated sensors and components.
		Brake Bleed Kit allows one person to bleed brake fluid easily and cleanly.
		Check vacuum operated components on cars and trucks, including distributor advance mechanisms, heater and air conditioning baffles, PCV and EGR valves, headlight cover doors, and transmission modulators.
	www.tradervar.com /cgi-bin/store/agora.cgi?cart_id=&page=cp7835.htm (145 words)

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