2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

how do you bleed the master clutch cylinder

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Old May 27, 2009 | 04:38 PM
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From: socal
how do you bleed the master clutch cylinder

Okay, I'm having problems with my clutch, i replaced the master and the slave two days ago, but i can't get all the air out. I was told that sometimes you have to bleed the new master, but i don't know how to. anyone know how to bleed the master?
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Old May 27, 2009 | 04:51 PM
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its called bench bleeding..the master is supose to be off the car and placed in a vise. then you take a plastic fitting and hose that usually comes with the master and you screw the fitting in where the clutch line would go and then attach the rubber hose and stick it into the resivour which should be filled with fluid, then you push the piston in and out until no air comes out of the rubber hose..thats it very easy
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Old May 27, 2009 | 05:42 PM
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Continue bleeding the system through the slave cylinder. The air will eventually exit through that bleed valve.
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Old May 28, 2009 | 04:25 AM
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well, it didn't come with a fitting or hose. where can i get one?
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Old May 28, 2009 | 10:06 AM
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IN Im Must be the exception to the rule

I have never bench bled any master cylinder on any car I've ever put one on and havn't had any problems bleeding it.
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Old May 28, 2009 | 10:18 AM
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here's a technique that i did, i had to replace both cylinder but i rebuild the master since it was still good but the slave was bad so i bought a new one. after installing i filled the clutch master with fresh brake dot 3 fluid. after that i opened the bleeder screw on the slave. i had a small syringe that i aquired from the vets after it was done being used. i used to to suck brake fluid in and fitted it to the bottom of the master cylinder and pumped it through. from the bleeder the old excess fluid and any air should be relieved. repeat the process until you are sure that your done. after you are sure that you are done. close the bleeder screw.

i didnt even pump the clutch pedal, but after i finished my pedal had pressure in it. broke in the new cylinders and they are still fine.
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Old May 28, 2009 | 10:20 AM
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dewey
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i actually did this after watching a youtube clip on how to bleed the system. they did it the other way from the slave to master but i couldnt do it like that so i bleed it the usual way but a bit different. try this out and also check for leaks.

good luck
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Old May 28, 2009 | 10:36 AM
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Originally Posted by jmabo205
well, it didn't come with a fitting or hose. where can i get one?
See the attached page from the factory service manual. There is a bleeder screw on the slave cylinder. So to bleed the air out of the system you use that screw.

To bleed the system, pump the clutch pedal a few times and hold it wherever it stops with pressure in the system or on the floor if no pressure is apparent. Have someone unscrew the bleeder screw a quarter turn or so while you continue to apply pressure on the pedal. Some fluid will drain out so make sure you have a hose connected to the bleeder screw to allow collection of the fluid in a container. When the fluid stops flowing out of the bleeder, your assistant will tighten the screw. [Snug it down, don't overtighten.] After your assistant lets you know that the bleeder screw is tightened go through this same process as many times as necessary until you get a firm pedal. During this operation make sure that the fluid in the clutch master cylinder does not run low. If it does, you will likely have to start over.
Attached Thumbnails how do you bleed the master clutch cylinder-bleeding-clutch-hydraulics.jpg  
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