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Thread: sleeving brake cylinder
03-28-2009, 07:11 AM #1
sleeving brake cylinder
I am restoring a willys jeep, and the master cylinder is pitted. I think I should bore it out and press a brass sleeve in. The master cylinder has a 1" bore and is 4" long. Has anyone done this before? I know this can be done by professional shops. I think i should remove 1/16 from the cylinder and press in a sleeve. Then ream the sleeve to original size. How tight should the sleeve be? I think it is enough with a light press fit?
I have a 9" SB C.
03-28-2009, 07:34 AM #2
Old corvettes have a lot of problems with the caliper bores so they sleeve them with stainless steel. I think this would be a better material to use. Chuck
03-28-2009, 08:00 AM #3
03-28-2009, 08:56 AM #4
03-28-2009, 09:22 AM #5
FYI -NEW master cylinder cost about $45.00 and repair kits are about $15.00.
Check out Rigid Steel .com
Just put a kit in my '46 CJ2A.
The amount of junk collected is proportional to the amount of space available.
A gun in the hand is better than a cop on the phone!
03-28-2009, 09:33 AM #6
Doesn't brass allow tighter fits than stainless before binding, e.g. a brass shaft can be a tighter fit into a ball bearing inner race with out risking it binding?.
The cylinders I saw sleeved in stainless here in Australia were commonly available reconditioned units, I have no idea what the stainless alloy was or how tight it was fitted.
03-28-2009, 09:51 AM #7
A master cylinder would never see those sort of temperatures, like a slave cylinder might.
03-28-2009, 10:52 AM #8
The best approach to repairing this problem is to simply replace the master
cylinder assembly with a new old stock unit. In the US these are inexpensively
available from a variety of sources. When I helped work on my neighbors
GPW jeep (same car) he was able to get fuel pumps, brake cylinders,
master cylinders, transmission parts, all new old stock. So one thing you might
do is search around and try to get plugged into a network of folks who work
on military vehicles like that and they might be able to steer you to a source.
Or, do a bit of legwork and find a supplier on your own.
It's nice to have new stuff on the vehicle as it makes it a much more reliable
driver in the long haul.
If you cannot find a replacement unit, then inspect the rebuild parts you will
be putting into it if you do rebuild it. The bore is probably a round number in
sixteenths of an inch and if so then you can purchase brass telescoping
tubing from a company called Small Parts in the US. This is how I did it when
I had to sleeve a cast iron master for a motorbike which was tough to get.
The bore of the tubing will be near net size for your piston and cups if you
So the drill is, bore out the ID of the cylinder, ream to size with a one over
reamer that allows a thou or so on the radius clearance for the tubing you
decide. Cut the tubing to length, deburr the ends. Degrease it all very
well and coat the exterior of the brass with locktite 600 series bearing
retention compund. In my case I cut some *very* shallow grooves on the
OD of the tubing (two or three thou only) to aid in retention.
Then drop it in, let it set up.
Drill the ports (can be tricky, some of them are very small and at an angle) and
then deburr the holes into the bore that you have made. Otherwise the
rubber seals will get torn up.
03-28-2009, 12:44 PM #9
Thank you Jim. This is exactly the info I want. I know there are NOS parts out there, and I know of most major suppliers of willys mb parts. Actually I have a gpw frame, with a willys body on. The easiest thing would be to get a replacement. Some of the nos master cylinders are post war and they are a little different. I like many others, like a challenge so I think I will try to sleeve it myself, to have the satisfaction of doing the rebuild myself.
03-28-2009, 01:38 PM #10
When you are done sleeving the master cyl fill the brake system with Dot 5 Brake fluid those master cylinders are open to the atmosphere . Unless you would like to change the Dot 3 every 6 months like the service manual recomends for those brake systems .Bill
03-28-2009, 02:42 PM #11
Back when I did classic car restorations I had cylinders relined from two different services. They were done in both brass and stainless. Both were of excellent quality in that they were finished to almost mirror like satin finish. The only service I remember the name of is Whitepost Restorations. They use the brass liner and will restore just about any cylinder, booster, caliper, or what-have-you to original or better specs AND a lifetime warranty. They charge accordingly.
Last edited by David Utidjian; 03-28-2009 at 02:43 PM. Reason: fiks speling
03-28-2009, 04:49 PM #12
OK, then try to get the "telescoping brass tubing" that I mentioned, it is tyipically
sold with 1/64 inch walls, so the bores come in 1/32 inch increments. Be sure to make
the thing a driver, not a hanger queen!!
03-28-2009, 05:10 PM #13
I have done this on a nisan but used stainless and shrunk fit after freezing it worked fine