Master Cylinder DEAD?
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Joined: Sep 2002
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Master Cylinder DEAD?
I have done a search of the posts here and haven't really found anything that seems to directly apply to my situation.
I can press the brake peddle down lightly, maybe the first 1/4 of the way down and the brakes grab just fine. After that the peddle just sinks right to the floor, not applying anymore pressure to the rotors.
There are no VISIBLE leaks in the system, I do understand there may be internal leaking going on, but i bieleve that if this were true I would notice a drop in the amount of brake fluid in my resovoir.
I haven't tested my brake booster yet because i am unsure how. I can look it up that isn't a problem, just looking for some ideas before I start to rip things apart possibly making things worse. I can't imagine it is air in the line, my esperience with air in a brake line is that you have to pump the peddle a few times to regain pressure, i have pressure right away, but it isn't maintained if i apply the peddle any further than 1/4 of the way down the peddles span.
Let me know if you have any other ideas.
I can press the brake peddle down lightly, maybe the first 1/4 of the way down and the brakes grab just fine. After that the peddle just sinks right to the floor, not applying anymore pressure to the rotors.
There are no VISIBLE leaks in the system, I do understand there may be internal leaking going on, but i bieleve that if this were true I would notice a drop in the amount of brake fluid in my resovoir.
I haven't tested my brake booster yet because i am unsure how. I can look it up that isn't a problem, just looking for some ideas before I start to rip things apart possibly making things worse. I can't imagine it is air in the line, my esperience with air in a brake line is that you have to pump the peddle a few times to regain pressure, i have pressure right away, but it isn't maintained if i apply the peddle any further than 1/4 of the way down the peddles span.
Let me know if you have any other ideas.
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Joined: Apr 2001
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From: vienna, va, us
Re: Master Cylinder DEAD? (ThaSpitefulWun)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ThaSpitefulWun »</TD></TR><TR><TD CLASS="quote">how do i test?</TD></TR></TABLE>
Get a new one.
I have replaced mine 2 times and just picked up another one, due to the current one has another internal leak.
Get a new one.
I have replaced mine 2 times and just picked up another one, due to the current one has another internal leak.
be professional
Joined: Oct 2002
Posts: 14,842
Likes: 13
From: Pittsburgh, PA
Re: Master Cylinder DEAD? (ThaSpitefulWun)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ThaSpitefulWun »</TD></TR><TR><TD CLASS="quote">There are no VISIBLE leaks in the system, I do understand there may be internal leaking going on, but i bieleve that if this were true I would notice a drop in the amount of brake fluid in my resovoir.</TD></TR></TABLE>
No. You would only notice a drop in fluid if it was leaving the system somewhere, which of course would be an external leak.
An internally leaking master cylinder does just that - it leaks within itself, without losing fluid.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">I haven't tested my brake booster yet because i am unsure how. I can look it up that isn't a problem, just looking for some ideas before I start to rip things apart possibly making things worse.</TD></TR></TABLE>
It is definitely not the booster. If the booster was bad, your pedal would be rock solid; to feel what the pedal is like without boost, just pump up the pedal while the car is off.
A bad master cylinder is the most likely diagnosis for the symptoms you described - I'd personally just go ahead and replace it. It is not too difficult, especially when you have a bleeder monkey to help you
No. You would only notice a drop in fluid if it was leaving the system somewhere, which of course would be an external leak.
An internally leaking master cylinder does just that - it leaks within itself, without losing fluid.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">I haven't tested my brake booster yet because i am unsure how. I can look it up that isn't a problem, just looking for some ideas before I start to rip things apart possibly making things worse.</TD></TR></TABLE>
It is definitely not the booster. If the booster was bad, your pedal would be rock solid; to feel what the pedal is like without boost, just pump up the pedal while the car is off.
A bad master cylinder is the most likely diagnosis for the symptoms you described - I'd personally just go ahead and replace it. It is not too difficult, especially when you have a bleeder monkey to help you
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Joined: Apr 2001
Posts: 197
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From: vienna, va, us
Re: Master Cylinder DEAD? (Targa250R)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R »</TD></TR><TR><TD CLASS="quote">
I'd personally just go ahead and replace it. It is not too difficult, especially when you have a bleeder monkey to help you</TD></TR></TABLE>
Bleeder Monkey = person in car to pump the pedal to pressurize the system then you open the valve and let fluid/air out. . . Over . . . And Over again.
Had to help people who don't know.
I'd personally just go ahead and replace it. It is not too difficult, especially when you have a bleeder monkey to help you
</TD></TR></TABLE>Bleeder Monkey = person in car to pump the pedal to pressurize the system then you open the valve and let fluid/air out. . . Over . . . And Over again.
Had to help people who don't know.
Joined: Apr 2004
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From: eau claire, wi, US
i would bleed it first too though.. couldnt hurt and it might just be air.. always nice to check free stuff first.. make sure you bleed with the car running and start with the one farthest from the master cylinder (rear passenger) and work your way closer..
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From: Hope Mills, NC, US
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From: San Fernando, Kali, usa
Re: (NCRXSi)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by smitty82pu »</TD></TR><TR><TD CLASS="quote">i would bleed it first too though.. couldnt hurt and it might just be air.. always nice to check free stuff first.. make sure you bleed with the car running and start with the one farthest from the master cylinder (rear passenger) and work your way closer..</TD></TR></TABLE>
I second that if all goes bad hit me up I got a mc and brake booster lying around in working condition could hook u up with it
as I upgraded to ITR and no need
but hopfully u won't need to search for a new one
I second that if all goes bad hit me up I got a mc and brake booster lying around in working condition could hook u up with it
as I upgraded to ITR and no need
but hopfully u won't need to search for a new one
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