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Old 06-22-2005, 12:23 AM   #1
dreaminsubys
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Member#: 71579
Join Date: Sep 2004
Vehicle:
1998 Legacy Outback

Question slave cylinder kit

Was wondering if anyone has any experience using the slave cylinder maintenance/rebuild kit from subaru. My car is a 98 Legacy Outback. Trying to decide whether or not to replace the insides or just order a new one. The current one has 125,000 miles on it. The kit is only like 12 bucks compared to 50+ for a new unit.

Thanks,
Pete
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Old 06-22-2005, 07:41 AM   #2
jac04
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Join Date: Dec 2003
Chapter/Region: NESIC
Location: Connecticut
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06 Legacy 2.5i Wagon

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I have experience using cylinder rebuild kits on my old Land Rovers (clutch slave, brake master) and my 68 Camaro (wheel cylinders). IMO, it is a cheap but temporary fix. Now, if the cylinder bore is like new you can get away with it. You can also hone out the cylinder a little to smooth it out. If you go too big the seal will leak so be careful. I have found that there is usually some cylinder bore damage, so it is better in the long run to replace the entire unit. You are going to have to bleed the system either way, so you might as well just replace the entire unit.
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Old 06-22-2005, 10:22 PM   #3
armand1
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It's the rubber seal moving against the cast iron inside of the cylinder that eventually wears out. If you've been good about changing your clutch fluid every 2-3 years to minimize moisture in the fluid (to prevent rusting), then the inside of the cylinder has a good chance of being rust-free and in good shape, just needing the new seal in the rebuild kit.
One option would be to just remove the slave, disassemble it and inspect/feel the cylinder bore for rust; if there isn't any, use a rebuild kit, and otherwise go for a whole new slave. Whichever way you go, remember that your master cylinder's seals have been in use as long as the slave's, and that the new seals on the slave will restore system pressure to "as new" levels. This may lead to you master showing leakage within a few days/weeks after you fix your slave. It doesn't always happen that way, but be prepared.
(My experience is from my '95 Miata's clutch slave/master).
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Old 06-22-2005, 10:32 PM   #4
Mulder
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Best bet for a lasting repair and reliable clutch operation- spend the $ and replace BOTH cylinders as suggested above. Messing with rebuild kits will likely be false economy and at best will allow you to postpone the inevitable for a short time (or as armand points out may only hasten the demise of the other cylinder that you didn't rebuild).
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