I can't justify buying a Mityvac just for oil changes, but if it also works for bleeding brakes then maybe it would be worth it. I have seen brake bleeders before that use pressure to force fluid through. It seems like the principle is the same...hook it up to a caliper with some sort of adapter, crack the bleed valve and suck the fluid through...but I don't know if that's different than forcing fluid through with pressure.
Can Mityvac 7201 bleed brakes?
- Thread starter LavaRand
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I don't like vacuum bleeding brakes. I feel the risk of draining air into the system is greater.
Brake bleeding is what I use mine the most for although it's the pneumatic version. It had the adapter and hose included if I recall. Of course you keep your eye on the master cylinder during the process, as in top it off after finishing each wheel, then you won't get any air.
This. In theory, Mityvac 7201 can be used for bleeding brakes. But the suction is so great, one has to be able to control it very fast.
Otherwise, air will get into the system, risky business.
I have tried the Mityvac method and did not care for it. It appeared that the vacuum was pulling in air past the bleeder screw threads. That made it impossible to know when I had removed all the air from the system. I much prefer pressure bleeding.
I'm curious too
I use Motive Bleeder, if you have any European vehicles, it's piece of cake.
I use the Motive Products brake bleeder. The key is to buy the one for your vehicle and to make a leak free connection with the master cylinder. Once set up, its a matter of opening and closing the wheel bleeders. Also, be advised that brake fluid will strip paint, so wash down the master cylinder and surrounding area with water when done.
You just fill it up, bleed one corner, refill, and so on. Not difficult.
Yes of course it pulls air past the bleeder screw threads, but so what. You know when you're done with that wheel when you see the fluid coming out turn from dark to clear so you know all the fluid in that line is new fluid. Ok, if the old fluid was clean as well, then you can gauge it by the amount the level drops in the master cylinder. If you added a quarter of the quart bottle of new brake fluid, it's certain that it's all new fluid through that line.
I am not saying that it can't be done with vacuum. It sounds like you are using a powered vacuum device that maintains continuous vacuum. I do think that continuous vacuum would work better if you want to use the vacuum method. I personally did not feel confident that I could maintain consistent vacuum using a Mityvac device as a vacuum source which is the OP's original question. I prefer the use of a Motive pressure Bleeder.
What's the problem with that? Why would you need constant vacuum? Even with my pneumatic vacuum bleeder, I remove the hose from the bleeder when finished with that wheel and let it gravity bleed for 10-20 seconds until there is a solid drip coming out.
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