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Old 09-30-2009, 05:38 PM
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bleeding brakes using vacuum pump

How would I use vacuum pump to bleed brakes? Particularly this one
http://www.harborfreight.com/cpi/cta...emnumber=92474
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Old 09-30-2009, 05:41 PM
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nevermind, I found this http://www.drivewerks.com/tech/mult_bleed_brakes2.htm
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Old 09-30-2009, 07:24 PM
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I have one like that but its not the same brand its a multivac and she s not working verry good maybe that one work better
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Old 09-30-2009, 07:52 PM
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Quote:
Originally Posted by Big_AL
I have one like that but its not the same brand its a multivac and she s not working verry good maybe that one work better
What's not working on it? If it's cheap it will probably break sooner or later. Even expensive tools break.
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Old 09-30-2009, 08:54 PM
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It's called the Mityvac. I use it all the time and love it. I works on vacuum. You connect the pump to bleeder with the correct hose end. Start pumping the mityvac. It has a gauge to let you know how much vacuum is pumped to. Then simply crack open the bleeder and the vacuum pulls the fluid through the line, air and all until the fluid come clear without bubbles. You have to do it several times to get the air out of the line. Works particularly nice with disc calipers which can be a pain to get air bubbles out of the line.
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Old 10-03-2009, 02:37 PM
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Quote:
Originally Posted by mitmaks
How would I use vacuum pump to bleed brakes? Particularly this one
http://www.harborfreight.com/cpi/cta...emnumber=92474
Just an update....I bought this one yesterday, today i'm trying to bleed brakes. Got it all hooked up and all. So I'm pumping and I see needle rise a bit, I opened bleeder screw and pumping it more...pump, pump, pump....Pop. It came apart, what a pita. I'm going back right now to exchange/refund this pos.
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Old 10-03-2009, 06:26 PM
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Your not suppose to pump pump pump with the bleeder screw open. You can't create vacuum. Vacuum is the part that sucks the fluid through the line and removes air. Pumping with the bleeder open will only ruin the bleeder tool by too much pumping and nothing happening. It's just like bleeding your brakes using the brake pedal. You can't build pressure and bleed the line with the bleeders open. Same principle! I might avoid the Harbor Freight tool, but my Mityvac has never failed me.
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Old 10-03-2009, 07:52 PM
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Quote:
Originally Posted by kleen56
Your not suppose to pump pump pump with the bleeder screw open. You can't create vacuum. Vacuum is the part that sucks the fluid through the line and removes air. Pumping with the bleeder open will only ruin the bleeder tool by too much pumping and nothing happening. It's just like bleeding your brakes using the brake pedal. You can't build pressure and bleed the line with the bleeders open. Same principle! I might avoid the Harbor Freight tool, but my Mityvac has never failed me.
I took that 19.99 pos back and got this one instead (it is Mityvac)
http://www.harborfreight.com/cpi/cta...emnumber=39522
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Old 10-03-2009, 08:29 PM
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Right on! Hey, even comes with directions in English and Spanish. What more can you ask for?
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Old 10-03-2009, 08:35 PM
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Originally Posted by kleen56
Right on! Hey, even comes with directions in English and Spanish. What more can you ask for?
I think it's missing an O-ring on the can, it had hard time keeping vacuum pressure up.
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Old 10-03-2009, 10:02 PM
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You may want to check the mityvac itself, Check the connection that connects to the bleeder. That needs to be snug and tight. They give you several different types of hose ends to use. It should snap on snuggly or it will suck air causing the gauge to go down. My mityvac also drops vacuum once in a while, slightly, but it does drop. Pump up the vacuum on the gauge and while the vacuum is high, crack open the bleeder. You'll have to do it several times before fluid comes out, eventually, it will come out and you can see it through the tube. Make sure the reservoir on the master cylinder is full of fluid as well.
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Old 10-04-2009, 07:58 AM
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Quote:
Originally Posted by kleen56
Your not suppose to pump pump pump with the bleeder screw open. You can't create vacuum. Vacuum is the part that sucks the fluid through the line and removes air. Pumping with the bleeder open will only ruin the bleeder tool by too much pumping and nothing happening. It's just like bleeding your brakes using the brake pedal. You can't build pressure and bleed the line with the bleeders open. Same principle! I might avoid the Harbor Freight tool, but my Mityvac has never failed me.
Thats why I don't like this tool , I was pumping with the bleeder srew open now I know how to use this one.
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Old 10-04-2009, 12:33 PM
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Quote:
Originally Posted by Big_AL
Thats why I don't like this tool , I was pumping with the bleeder srew open now I know how to use this one.
What's wrong with pumping with bleeder open? That way you keep constant vacuum...
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Old 10-04-2009, 12:53 PM
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Quote:
Originally Posted by mitmaks
What's wrong with pumping with bleeder open? That way you keep constant vacuum...
It doesn't work that way, you have to have pressure to create vacuum. It is possible what you speak of, but that is known as a power bleeder system, where pressure, not vacuum, pushes the fluid through the tubes. You have to build pressure (vacuum) than the pressure will "pull" not push the fluid through the lines. You have to have some type of pressure or even gravity to get brake fluid to flow or move through a small diameter hole.
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Old 10-04-2009, 12:59 PM
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well I spent 4 hrs trying to flush/bleed whole system. I've used whole qt of brake fluid. Rear brakes had very dirty fluid in them.
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