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Join Date: Nov 2007
Location: Chandler, Arizona
I change my brake fluid once a year, on a bike I bought new, and have had no brake problems in 70,000 miles. I have never had a VN750 master cylinder apart, but am assuming they are just like any other Japanese master cylinder. Once you get it apart, and get all the rubber and plastic parts off, you can clean it with brake parts cleaner, and use a small E string from a guitar to clean out the return passage if you suspect it is plugged up. You could also try spray brake parts cleaner with a straw, or compressed air. But I have been using the guitar string to clean small passages for decades, and have never messed anything up yet. I started using one on carburetors back in the '70s, a motorcycle mechanic told me about it.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike