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Bleeding Master Cylinder Question

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Old Sep 16, 2012 | 10:55 PM
  #1  
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Default Bleeding Master Cylinder Question

I bought a kit in order to bench bleed my master cylinder.

My question is, after I have all the fittings and the tubes in place in order to bleed it, when I pour the brake fluid into the resovoir it leaks out of the other side.

Am I suppose to plug that opening? Or does this mean that my Master Cylinder is bad?

I apologize if this may seem like a dumb question. This is the first time I'm bleed a master cylinder and although I've read so many threads I still don't understand what I'm doing wrong?

If the master cylinder is bad, what do you guys recommend I buy as a replacement? I know these are almost impossible to find new and I've heard plenty of bad reviews on the Cardone Reman products. Would a Napa or Autozone Reman be any better?
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Old Sep 17, 2012 | 02:03 AM
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I'm assuming you mean it's leaking out of the plunger rod side. No it should not leak there or anywhere. Last time I replaced my '89 coup's master cylinder I bought it locally and it was an aftermarket new one. You should be able to find a new for your C4 whatever year it is.
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Old Sep 17, 2012 | 03:19 AM
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Hey, no I don't believe it's from the plunger rod side.

It's leaking out of this outlet on the reservoir as you can see in this picture. Am I suppose to plug this when bench bleeding the master cylinder? If not, I suppose the master cylinder is bad since it's not suppose to be leaking from anywhere?



BTW, my C4 is a 93. I will look into finding a new one if it is indeed bad. So far I've only found a few new aftermarket ones for sale.

Fenco from Autozone for $250

Centric from Rockauto for $180

Wagner from Roackauto for $230

Raybestos from Rockauto for $203

All opinions are welcome and appreciated.

Last edited by xsalvioutlawx; Sep 17, 2012 at 03:45 AM.
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Old Sep 17, 2012 | 07:34 AM
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Originally Posted by xsalvioutlawx
Hey, no I don't believe it's from the plunger rod side.

It's leaking out of this outlet on the reservoir as you can see in this picture. Am I suppose to plug this when bench bleeding the master cylinder? If not, I suppose the master cylinder is bad since it's not suppose to be leaking from anywhere?



BTW, my C4 is a 93. I will look into finding a new one if it is indeed bad. So far I've only found a few new aftermarket ones for sale.

Fenco from Autozone for $250

Centric from Rockauto for $180

Wagner from Roackauto for $230

Raybestos from Rockauto for $203

All opinions are welcome and appreciated.
plug it and then bleed
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