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General question about master cylinders
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olddude
Novice
Nov 12, 2012, 7:59 AM
Post #1 of 7
(1975 views)
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General question about master cylinders
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Could someone school me on what the difference is between a brake master cylinder and a clutch master cylinder.....other than the obvious of course that one is used for brakes and the other clutches. I guess what I am wondering is do they both work the same with regard to pressurizing the out line to the brake or slave cylinders. I am working on a clutch system and can't decide which piece is bad, the clutch slave cylinder or if it's the master cylinder at fault.
With the reservoir full and I push the pedal down all that comes out of the line is a a misting but if I put the cylinder into a pail of brake fluid with the output hole covered it will pump it's butt off. It seems like I just have air in the lines but I have done everything I know to get the air out and still can't seem to get it to pump with everything hooked up.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 12, 2012, 8:55 AM
Post #2 of 7
(1952 views)
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Re: General question about master cylinders
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What was the original problem before you started messing with it?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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olddude
Novice
Nov 12, 2012, 9:28 AM
Post #3 of 7
(1943 views)
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Re: General question about master cylinders
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No pedal, it would not move the slave cylinder. The res had fluid in it although it was a little low. I didn't see any leaks anywhere.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 12, 2012, 9:39 AM
Post #4 of 7
(1935 views)
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Re: General question about master cylinders
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That would indicate a bad master cylinder. They can be very difficult to bleed because the bleeder is at the bottom and the air tend to rise to the top.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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olddude
Novice
Nov 15, 2012, 6:16 AM
Post #5 of 7
(1891 views)
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Re: General question about master cylinders
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There is no bleed valve on this master cylinder. The only way fluid can enter or leave this master cylinder is through the fill cap (which is sealed with a gasket and un-vented) or the line that goes to the slave cylinder. The slave cylinder has a bleed valve but there is none at the master.
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olddude
Novice
Nov 15, 2012, 12:36 PM
Post #7 of 7
(1872 views)
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Re: General question about master cylinders
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Well I'm not trying to tell you anything other than what I can see. There is no bleed screw on the MC. I'm not saying it might not be leaking by the seals on the piston. The MC will transfer fluid on the bench as long as the outlet port is lowered into a container of brake fluid.
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