LINKS
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BRAKE CYLINDER REBUILD SERVICES
Anyone who has ever purchased an Isetta or BMW 600 has at one time or another faced the fact that years of sitting round take their toll on the brake cylinders.  All of my cars at one time or another developed leaks at the wheel cylinders.  In the late 60's and early 70's when I first started driving and working on these cars you could hone them and hopefully stop the leak.  Eventually, this no longer worked as the rust pits got deeper and the cylinders had to be replaced.  Back then replacing the wheel cylinders or even the master cylinder was not that big of a deal.  Cylinders were still available and at a relatively low price.  Today, wheel cylinders will cost over $150.00 each with the master cylinder going for over $300.00.  Fortunately, there is an alternative, you can have the cylinders lined with brass at about half the cost of new cylinders.
If you are interested in attempting this process yourself click here to download a set of instruction for this process.  These instructions are also available on my 300 and 600 download pages.  If you do not feel comfortable attempting this process, I will perform this for you for $70.00 each.  I do require that you have a rebuildable cylinder.  As long as the pistons have not been damaged, or the bleeder screw / threads have not been damaged beyond repair, this fee is good.  Recently, I have developed a process for relining the master brake cylinders as well.  This is not discussed in the download material, but the process is similar for the master cylinders.  The cost to rebuild a master cylinder is normally $170.00 with a usable core.  If the threaded rod is missing or broken, the cost is slightly higher. 
Check my parts page (300 parts & 600 chassis parts) for photos of these cylinders.
Below is a sample of what the cylinders look like after rebuilding.

UPDATE:

I have converted over to include powder coating of all wheel and master cylinders.  All items being shipped now are powder coated.  All wheel cylinders are being shipped with new bleeder screws and original style dust caps.
I have been asked on a few occasions to post my address on this web page.  I would perfer to provide that information via email after we have discussed your rebuild requirements.  Please use the email address button below or the one at the top of each page.  Thanks!
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