In a follow up to my earlier post on brake fluid and lithium grease: Well, after some effort, I was able to get one master cylinder cap screw out and drilled/easy-outed the other. I added some DOT 4 brake fluid and all seemed ok until I noticed a leak, I believe, at the juction of the feed line to the master cylinder, when I applied the brake. I think one of the washers plates at the junction is leaking. It leaks out to a certain level and then stops leaking. The brake works fine, but the fluid is below the level indicator. So I am trying to decide whether or not to replace the old unit with a new complete master cylinder, or just order a new diaphram gasket and two washer plates. How long do these units usually go before they fail? If I do go with a replacement, can anyone help explain how the front brake stop switch assy is disconnected? In any event, I will have to bleed the line. Would the best appoach be to disconnect the line at the caliper, drain the old brake fluid, reconnect, fill the reservoir, open the bleed skrew, pump the brake until fluid runs steady, close the bleed skrew, fill to level indicator and replace the diaphram and cap? Boat.net lists the washer plate as obsolete. Ron Ayers and Online Cycle Parts list the washer plate. On my Yanmar diesel engine, the fuel lines use copper washers at the connection points. Could I just buy some correct sized copper washers or does the DOT 4 fluid require special washers? I have come to use my rear brake more forcefully, even though the front still works, which is a good thing because I was favoring the front brake too much anyway. Thanks for any advice you can provide.