Reproduction Honda rubber diaphragm for the front or rear master cylinder. This is the diaphragm that seals between the brake reservoir cap and the master cylinder assembly. If you notice that your brake fluid reservoir is leaking fluid onto your gas tank, it could be the diaphragm that isn't making a tight seal or the leak could be coming from the piston. Check the fitment list below to see where it was used on your model.
Brake fluid will ruin painted surfaces, it's best to keep it where it belongs!
Sold individually. We also carry the plastic washer used on the master cylinder, sold separately.
Honda Part Number: 45520-300-000
Fits Honda - (Note Front or Rear):
ATC250R - 1982 - Rear
CB350F Four - 1972-1974 - Front
CB360K - 1974 - Front
CB360T - 1975-1976 - Front
CB360G - 1974 - Front
CB400A Hondamatic - 1978 - Front
CB400F Super Sport - 1975-1977 - Front
CB400TII Hawk - 1978 - Front
CB450K - 1970-1974 - Front
CB500K Four - 1971-1973 - Front
CB500T Twin - 1975-1976 - Front
CX500 - 1978 - Front
CX500TC Turbo - 1982 - Rear
FT500 Ascot - 1982-1983
VF500F Interceptor - 1984-1986 - Rear
CB550F Super Sport - 1975-1977 - Front
CB550K - 1974-1978 - Front
CX650T Turbo - 1983 - Rear
VF700F Interceptor - 1984-1985 - Rear
VFR700F Interceptor - 1986-1987 - Rear
CB750A Hondamatic - 1976-1978 - Front
CB750F Super Sport - 1975-1976 - Front + Rear
CB750F Super Sport - 1977-1982 - Rear
CB750K - 1969-1978 - Front
VF750F Interceptor - 1983-1984 - Rear
VFR750F Interceptor - 1986, 1994-1997 - Rear
VFR750R - 1990 - Rear
VFR800 - 2002-2009 - Rear
CB900C - 1980-1982 - Rear
CB900F Super Sport - 1981-1982 - Rear
CB1000C - 1983 - Rear
CBX - 1979-1982 - Rear
GL1000 Gold Wing - 1975-1979 - Rear
GL1000 LTD - 1976 - Rear
VF1000F Interceptor - 1984 - Rear
VF1000R - 1985-1986 - Rear
CB1100F Super Sport - 1983 - Rear
GL1100 Gold Wing - 1980-1983 - Rear
GL1100A Gold Wing Aspencade - 1983 - Rear
GL1100I Gold Wing Interstate - 1983 - Rear
ST1100 - 1991-2002 - Rear
VF1100C - 1983-1986 - Rear
VF1100S - 1984-1985 - Rear
GL1200 Gold Wing - 1984 - Rear
GL1200A Gold Wing Aspencade - 1984-1986 - Rear
GL1200SEI Gold Wing - 1986
VFR1200F - 2010, 2012-2014
VFR1200X - 2016 - Rear
VT1300CX - 2010-2015 - Rear
GL1800 Gold Wing - 2001-2005
GL18003 - 2006-2008
GL18004 - 2006, 2009, 2010, 2012, 2013-2016
GL18005 - 2006-2010, 2012-2016
GL18007 - 2006-2010, 2012-2016
GL18008 - 2006-2010, 2012-2014
and many others....fits nearly 1000 different Honda models...
