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Old 11-06-2011, 08:06 PM
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Bench Bleeding Master Cylinder

First time installing a new master cylinder and I have a question about bench bleeding the master cylinder. After you bleed it and remove the plugs from the outlet ports, will brake fluid leak out or will it not leak unless you depress the clyinder. Curious because I want to know if this is going to gert messy.

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Old 11-06-2011, 09:07 PM
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Quote:
Originally Posted by Dougie
First time installing a new master cylinder and I have a question about bench bleeding the master cylinder. After you bleed it and remove the plugs from the outlet ports, will brake fluid leak out or will it not leak unless you depress the clyinder. Curious because I want to know if this is going to gert messy.

You will have some leak out...
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Old 11-07-2011, 05:08 AM
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uuuuuuhhhh yeah - you have to remove those plugs to bleed it, even if you use that Dorman HELP bleeder kit from Auto-Zone (which works well) and pump the fluid back into the reservoirs. So, in answer to your question, yes, there will be some amount of fluid lost - just make sure it isn't any where near anything with paint as brake fluid WILL eat through.
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Old 11-07-2011, 05:24 AM
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Some M/C bench bleed instructions call for installing plugs into the discharge ports and then to pump the piston until bubbles quit coming from the fill ports in the bottom of the reservoir. But either way- plugs or fittings w/hoses looped back into the reservoir, they will dribble a bit of fluid when the plugs/fittings are removed.This won't reintroduce air into the M/C, but you still have to bleed the lines, obviously.
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