Jimm 11/29/2012Try the 'How-To-Guides' feature on the AutoMD website for the general repair steps. You can also reference the auto shop manuals at your local library.
Not necessarily common for the master cylinder at 52k miles - but still possible. Parts life (longetivty) somewhat depends on the maintenance provided - for example, in the case of the brake system - when was the last time the old brake fluid in the system was changed / flushed and replaced with new fluid - according to service recommendations?
Try the many on-line auto parts sources, such as; www.autopartswarehouse.com or www.rockauto.com for the replacement parts.