Master cylinder- rebuild or replace? |
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Scott R
Member Joined: 16 Mar. 2007 Location: Gaines, MI Status: Offline Points: 1392 |
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Posted: 06 May 2007 at 10:38am |
Never done a master cylinder rebuild before, but always willing to explore the unknown. Would like to know from those that have been there done that… is the cost, time, trouble worth rebuilding vs. just buying a new one? |
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Bluax
Member Joined: 04 Feb. 2006 Location: Phoenix Status: Offline Points: 750 |
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If I can do it, ANYBODY can do it! and I've done it at least 4 or 5 times and have now even graduated up to rebuilding fuel pumps. Degree of success on the master cylinder can, however, depend on the bore wear. When disassembling just lay the parts out in order (assuming it was working before, if not, its a fairly logical system).
B
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Mountains ta climb, roads ta drive an' rivers ta paddle .... now 'Ride Bambino, Ride!'
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F Bill
Member Sponsor Member x 2 Joined: 05 Dec. 2005 Location: central Texas Status: Offline Points: 7752 |
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If you can operate a brake cylinder hone and a spray can, you can do a master cylinder. Make certain the old stuff matches the new stuff and that the piston returns as far with the new stuff installed as it did before. Some kits seem to contain extra parts that if installed keep the piston from a full return, and they don't let the bleedback hole inside the bore get uncovered, so the brakes tend to build up pressure and drag.
If the bore cleans up nicely without pitting in the crucial areas where the seals would be during operation, you should have it made in the shade. Be certain to clean out all the holes and passageways with compressed air or whatever....(not that there are many to clean but there are all important.....)
If you want more info check out an older motors manual from the library and read up on brake parts rebuilding. Newer manuals don't cover it much as it is more practical for a shop to simply install rebuilts.
When you reinstall, pay close attention to pedal freeplay and brake pushrod freeplay measurements. Making the pedal too "tight" will also allow the pedal to hold the master piston partially engaged and create drag in the brakes that only will go away if you bleed away the pressure ....and it will build right back up next time you use the brakes.
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If you haven't checked out the tech FAQ section, go to:
http://www.thecj2apage.com/forums/tech-faq_forum57.html for a lot of great stuff you need to know!! |
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hillbilly21
Member Sponsor Member Joined: 18 June 2006 Location: USA Status: Offline Points: 4964 |
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Save time ..replace it with a new one for under 60.00....get the Jeep on the road summer is coming
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Turtleherder
Member Joined: 15 Jan. 2006 Location: Asheboro, NC Status: Offline Points: 303 |
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Hillbilly. You and I both know the pleasure and reward of doing it ourselves and reaping the benefits later. Done right. It shouldn't take much longer than to just replace the old one with a NROS. Remember, there isn't an endless stream of parts. I say, let the rookie go for it.
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Scott R
Member Joined: 16 Mar. 2007 Location: Gaines, MI Status: Offline Points: 1392 |
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You may have just provided the key phrases to my decision. It's not that this one doesn't work very well... it's completly shot and has been for a long time. Guess I need dig into it and see if there is any corrosion.
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uglyjeep
Member Joined: 08 Aug. 2005 Location: Mukwonago, WI Status: Offline Points: 1060 |
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Scott, if you find your core is unrebuildable, drop me an email, I have a used one here that I can check to see if its OK, and send to you for just the postage cost if you need it. Let me know, thanks!
Daniel
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dclear
Member Joined: 12 July 2006 Location: Milwaukee, wi Status: Offline Points: 927 |
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I rebuilt mine, and the bore was rather "on the edge" but it does not leak. Just be sure that all the pieces are in the kit you rebuilt with. Last winter I went through all sorts of gyrations due to a missing part in the rebuild kit that I failed to notice, or, thinking stupidly, that it's absence was an "upgrade."
You don't get much wiggle room on these cast iron parts. OTH you cant always depend on new parts--they sometimes are junk from the factory. I'd trust Daniel--you can hone them out, and a hand drill operated hone is not all that expensive.
You win, you win. You lose, You lose. I think it's worth a try. You can always start over with new, and there is really not much hassle in replacing a MC if you dont mind wrinkly paint.
del clear
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del clear
Together we can figure it out, after all, it's only a machine, if a man can build it, a man can fix it. {Author: bkruetz} |
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Scott R
Member Joined: 16 Mar. 2007 Location: Gaines, MI Status: Offline Points: 1392 |
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Daniel, Thank you very much! I just might take you up on that offer.
Once I get a couple hours of down time I'm going to look a little further into the one I have. Edited by Scott R - 11 May 2007 at 9:42pm |
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p3ferris
Member Joined: 22 July 2005 Location: Norfolk Nebraska Status: Offline Points: 3812 |
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I rebuilt mine. Never done one before and I found out it is very simple. They make a rebuild kit and a hone for doing it. Way less than 60.00.
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Ed
cj2a lefty |
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Scott R
Member Joined: 16 Mar. 2007 Location: Gaines, MI Status: Offline Points: 1392 |
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Where is a good place to buy a rebuild kit?
I looked at Walck's and they list a Master Cylinder Repair Kit for $9.95
Seems awful cheap.... would this have all the goodies for a complete rebuild?
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sean
Moderator Group Sponsor Member Joined: 20 July 2005 Location: North Idaho Status: Offline Points: 7388 |
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Got mine at NAPA for $14.95.
The same rebuild kit works in many older vehicles, so it's fairly common. Edited by sean - 11 May 2007 at 10:10pm |
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p3ferris
Member Joined: 22 July 2005 Location: Norfolk Nebraska Status: Offline Points: 3812 |
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Mine was 11.00 and some change
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Ed
cj2a lefty |
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DaveyK01
Member Joined: 22 Aug. 2007 Location: Lewistown, PA Status: Offline Points: 506 |
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This is way after the original post, but my master cylinder is leaking and it has maybe 3K miles on it. I replaced it during the rebuild of my Cj3A. Question is could the parts be replaced without removing the cylinder from the jeep? I can not see it needing "honed out" with so little use on it. Are the repair parts a lot cheaper than a replacement cylinder? Dave
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Dave
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