assisting a widow whom hubby has passed on. need to sell car in a few months and checking it over note brake reservoir was near empty and foot brake went almost to floor pumping it made no difference and standing on it ..didn't sink to floor! checked under hood around servo.master brake etc and NO fluid leaks found. so checked each wheel inner area for 'wet' patch ..maybe a slave cylinder leak? but nothing found. too cold and windy/wet to start serious work such as stripping each wheel down and checking for leak(s) so putting repairs/strip etc off until probably march. anybody had such a missing fluid issue ? and where/how fixed? wonder if its an internal leak on servo ? and how does one check for that!