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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 (1250 views)
General question about master cylinders Sign In

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.Cool 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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 12, 2012, 8:55 AM

Post #2 of 7 (1227 views)
Re: General question about master cylinders Sign In

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.



olddude
Novice

Nov 12, 2012, 9:28 AM

Post #3 of 7 (1218 views)
Re: General question about master cylinders Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
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Nov 12, 2012, 9:39 AM

Post #4 of 7 (1210 views)
Re: General question about master cylinders Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



olddude
Novice

Nov 15, 2012, 6:16 AM

Post #5 of 7 (1166 views)
Re: General question about master cylinders Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 15, 2012, 7:32 AM

Post #6 of 7 (1158 views)
Re: General question about master cylinders Sign In


Quote
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)


OH really? And how sure are you about that?

Are you trying to tell me that fluid can't leak past the piston seals?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



olddude
Novice

Nov 15, 2012, 12:36 PM

Post #7 of 7 (1147 views)
Re: General question about master cylinders Sign In

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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