Mighty Vac Brake Bleeder Conversion

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  #1  
Old 01-14-16, 07:12 AM
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Mighty Vac Brake Bleeder Conversion

I have a Mighty Vac brake bleeder kit and was wondering if there is an easy way to convert the hand pump so that it applies pressure rather than vacuum. I'd like to use it to pressure test a radiator cap and a radiator. I noticed on their website that they have an MV8500 pump that has a reversing switch, but was hoping maybe mine could be converted as well. I can get just the pump for about $60, which isn't bad, but it isn't obvious if I can buy just the radiator/cap attachments.
 
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  #2  
Old 01-14-16, 07:47 AM
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Is there a leak in the cooling system? If not, I think that you are looking for trouble.
 
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Old 01-14-16, 07:49 AM
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No leak. I was going to just test the cap to see if it is good, but figured I'd pressure test the radiator as well. The service manual says up to 17 psi is safe.
 
  #4  
Old 01-14-16, 07:56 AM
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When you put pressure in the system, you are pressurizing all of it, including the heater core. If you put a hole it that, you won't be a happy camper. Forget about it.
 
  #5  
Old 01-14-16, 07:57 PM
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Okay, so I won't use it on my vehicles, but I'll use it on my dirt bike. I went ahead and ordered the MV4650, so I'll just have two pumps. No biggie.
 
  #6  
Old 01-14-16, 11:40 PM
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It sounds like you can't resist. Have fun.
 
  #7  
Old 01-15-16, 06:53 AM
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What's the problem? The heater core is pressurized same as the radiator so it will survive being tested to the system pressure.
 
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Old 01-15-16, 07:25 AM
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The heater core is pressurized same as the radiator so it will survive being tested to the system pressure.
That's the book answer. The real life answer is the heater core could have gotten weak for some reason. Pressure tests are used to locate a leak not to create a leak. Why risk it? I don't get it! There is no reason whatsoever.
 
  #9  
Old 01-18-16, 07:31 AM
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You missed my point. If the cap is rated at 16psi and is working correctly that core and radiator are always at that pressure so testing AT THAT PRESSURE presents no new hazard.
 
  #10  
Old 01-18-16, 01:52 PM
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Again, that's the book answer & doesn't represent all scenarios. I don't see the benefit of testing a system that has no problems.
 
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