What do you guys think of rebuilding the clutch master cylinder and slave cylinder versus buying new ones? One advantage is I could do the mods to them more easily:

http://www.taboospeedshop.com/cmc.htm

Ken's post, 2nd from the bottom:

http://www.galantvr4.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=2;t=001333

Thanks.

dp

Is that "new one" meaning slave cylinder? Or "new one" meaning slave cylinder piston?

dp

This is where i just got mine, but my friggin clutch went the day after i installed it (a few days ago). is this a good master and slave for our cars?????? i asked before i bought it and it seemed like yes,
but someone tell me, could this be what toasted my 4 month old clutchmaster 2500lb clutch???

http://store.yahoo.com/shopctc/clmaslcypa.html

I love my GVR4 so much and she keeps doing this to me, i cant take it anymore! she has been draining all of my money for the last 2 years! AHHHHHHHHHHHH!!!!!!!!

Ok, i feel better. had to let that out.

~Aaron

quote:

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Originally posted by ayvr4:
This is where i just got mine, but my friggin clutch went the day after i installed it (a few days ago). is this a good master and slave for our cars?????? i asked before i bought it and it seemed like yes,
but someone tell me, could this be what toasted my 4 month old clutchmaster 2500lb clutch???

http://store.yahoo.com/shopctc/clmaslcypa.html

I love my GVR4 so much and she keeps doing this to me, i cant take it anymore! she has been draining all of my money for the last 2 years! AHHHHHHHHHHHH!!!!!!!!

Ok, i feel better. had to let that out.

~Aaron

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I bought both there a few months ago for #782. They said that they get them from the same place as Mitsu. -They just cut out the middle man.

Mine has been draining me for about 5 years. I keep thinking it will get better. Then I take it for a drive and the bad memories fade.

Well, here is my story. When I went to rebuild mine, I just went to a local store. I was in a hurry. I got the part, but the cylinder was too big. Maybe just a mm, but the bitch wouldn't fit. I tried a yet another chain thinking it was just a mistake, but I got the same problem. At this point I called up the dealer, gave them my vin number and ordered the rebuild kit.

I thought for sure I had it. Nope, too big. On the mitsu part, the stocker piston in green and I got a pink one that was just a tad too big to fit in the stock slave. Well, I had to fix my leaky problem cause this car was used to get to work. No backup. I just ordered a whole new one. When I did, it came with the pink cylinder.

I have no ideal why no one (even Mitsu) could not match the stock piston on a rebuild kit. It's only maybe 1, 1.5mm bigger, but when you are tring to rebuild the slave with a bigger piston, it seems a lot bigger.

To this day, I don't know why there is a green (smaller piston) and a pink (bigger piston) for the slave cylinders or why even the dealer with the VIN couldn't get the right part to me.

I can only guess that the stocker is NLA.

Joe/DSMSLEEPER,
did you just put that master & slave in as is, or did you do anything special to it??
Thanks
~Aaron

quote:

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Originally posted by dsmsleeper:
I just went to rebuild mine, and my stock piston is green, the one from the rebuild kit is red and smaller. It's seems to be too small to work right. Hmm...

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Yikes. Maybe that is from a Galant GSX or something. Did you order that using your VIN#?

After all the uncertainty, my plan is to buy a new slave cylinder and a rebuild kit for the master. I still plan on doing the mod for each.

dp

well crap.
I bought a rebuild kit and it had a green piston (larger than the one on the car). The car had a smaller pink piston. Seems like this is the mystery of the slave cyclinder rebuild kits. I put the one I had back together and removed the clutch restrictor. so far its the same amount of pedal play. im not sure what people are referring to when they removed the restrictor.

DongeR

The 92 model year had the smaller piston slave and the 91 has the smaller piston. I rememer that the 92 was about 8% smaller than the 91 but dont remember the dimentions exactly but I beleive they were 11/16 and 3/4. prob the green and pink thing. If you got the wrong one with the vin someone prob put in the wrong diameter one in it so when they look it up by vin it will be wrong so it may not be the parts guys fault.

If you don't want to read my above post...

Alright, Hydraulics 101. When you increase the size of a hydraulic piston, it now pushes more fluid with the same movement. Conversely, when you decrease the size of a piston, it moves less fluid with the same movement.

I'll give you two scenarios and you can vice versa them on your own. So, here's what happens when we change the master cylinder. Lets make the bore bigger. You'll be pushing the pedal the same amount as normal and because the bore is bigger, you'll be pushing more fluid. Since you're doing more work with the same movement, the work will be harder, i.e. the pedal will be stiffer. This translates into more clutch movement with the same pedal movement.

Now, lets make the slave cylinder bore smaller. With the same fluid movement coming from the master cylinder, the piston now moves more than it did before. Again, we have harder work with same travel so pedal is stiffer. Since the piston moves more, the cluch releases more for the same amount of fluid coming from the master cylinder.

Understand now? This applies to all hydraulic systems so if we discuss brake masters and caliper piston sizes, you'll be able to apply this to that as well.

Mark