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

Clutch Cylinder or Master?

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Old 09-27-10 | 03:35 PM
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Rx7Convert's Avatar
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Clutch Cylinder or Master?

Trying to figure out if my clutch cylinder or master has gone out. I'm basically hemorraging all my brake fluid out ever 24 hours. I have someone to help me install the part, step-dads a master mechanic. I'm just trying to trouble shoot which it might be.

Any suggestions? I know they're both cheap, should I just replace both and be done with it?
Old 09-27-10 | 03:40 PM
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did you check for leaks?

i just changed both out for less than 100 bucks, so that's what i suggest.
Old 09-27-10 | 05:08 PM
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Pull the carpet back up by the clutch pedal, if it is soaked with clutch (brake) fluid then its the clutch master cylinder. Pull the rubber boot off the clutch slave and if it pisses fluid then its the slave.
I am with GLP just replace both, usually if one is bad the other in not very far behind it..
rk
Old 09-27-10 | 05:11 PM
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do both, and the line- be good for another 20 years
Old 09-27-10 | 07:36 PM
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Originally Posted by rob xx 7
do both, and the line- be good for another 20 years
+1
Old 09-27-10 | 10:23 PM
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I used a rebuild kit, repolished/honed the bore and it worked like a champ.. my .02
Old 09-27-10 | 11:18 PM
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Must be something in the water - I just replaced both on mine. Its always best practice to replace both at the same time - If one is leaking chances are they both are.
Old 09-27-10 | 11:47 PM
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+1 replace both. If one went, the other is going to go soon as well.

Besides losing lots of brake fluid, what makes you think it's the clutch, if you dont mind me asking?
Old 09-28-10 | 12:48 AM
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Originally Posted by rk970
Pull the carpet back up by the clutch pedal, if it is soaked with clutch (brake) fluid then its the clutch master cylinder.
It is actually possible for the clutch master to be leaking fluid more or less invisibly. When I recently removed mine to replace it, I saw that fluid was leaking from the rear of the piston into the space between the two sides of the firewall. The firewall in that area is double-walled and there is about a 1/2" gap that is stuffed with sound-deadening insulation which can soak up a lot of fluid. Just because your carpets aren't saturated with brake fluid doesn't mean you don't have a leak there.

Agreed with everyone else that you should just replace all the hydraulics. It's cheap and it's one less thing to worry about in your 25 year old car.
Old 09-28-10 | 07:03 PM
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Replaced both from Rockauto.com for less than $67.
Old 09-28-10 | 07:09 PM
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Do them both or you'll just be doing it again. AMEN
Old 09-28-10 | 10:06 PM
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Replace both as everyone else has already said its a huge headache when you just replaced one then another craps out on you and they are cake to replace. I had hard fuel lines leaking on my car but I replaced them both and all the brake lines running from the engine bay to underneath and to the back and rear brakes of the car.
Old 09-29-10 | 02:12 AM
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Truly NOT a head ache. Both are up on top and accesible. Shop around for the best price. Lots of close-outs on Rockauto.com.

GD
Old 09-29-10 | 09:28 PM
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From: buffalo grove IL
change both but also get a braided line cuz the stock line wit the rubber tubing seen to expand alot an leak wen its really old
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