I read not to go over 15mmhg or you could start sucking in air through the slave cyl seal. But I’ll try more! Hope it works!When you have vacuum on the system the pedal will not function properly. Trying to pull the pedal up while under vacuum may have just pulled air through the slave, and given you the dead pedal.
The idea is to get old air and old fluid out so it can be replaced by fresh fluid in the reservoir.
Apply up to 30mmHg vacuum, with a reservoir of new fluid. When the pedal is all the way down and no more fluid comes out, remove the mity vac hose and that will "suck" new fluid into the master.
Repeat a few times.
Only pull the pedal back up, and check fluid levels once you have removed the mity vac.
Look for leaks on the lines or slave. Check pedal function.
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My problem is I draw a tiny bit of old fluid from the line at the bottom of the reservoir and fresh fluid fills back in the line but after that I can’t get any more dirty fluid. I just keep sucking the fresh fluid in the line over and over, No matter how much I vacuum (I’ll go try more vacuum up to 30mmhg).
Even when I pull the pedal up the master cyl doesn’t fill with any fluid, that’s why I think there must be a clog on the inlet or something.
I bought a new OEM master cylinder I guess just in case I need to replace.
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