Front brake master cylinder part numbers and specifications – Honda CX500, GL500, CX650, GL650

Looking for the master cylinder part number or piston rebuild kit for your Honda CX500, GL500, CX650, GL650 or Turbo? Find the list here with links to genuine items when possible!

Not sure what the product code numbers equate to? See this page.

Wondering what all the sub-script Z/A/B/C is about? See this page. The year code, listed year below and year your bike is actually registered/complianced may not match – for example, some 1981 CX500CBs may not have been complianced until 1982 and would be marked as 1982 on the compliance plate. You may see the year code written in sub-script in some areas online and in publications and not in others.

Honda’s country codes can be found on this page – that’s the U, CM, DK etc. listed below.

The majority of this data was collated by Georg Henkelmann. Thanks, Georg!

Year Bike Master Cylinder Part Number
(links to sources)
Piston set Part Number
(link to rebuild kit)
Bore diameter
1978 CX500 (U) 45500‑413‑651
CMSNL
45530‑404‑305
CMSNL
14mm
1978 CX500 (CM) 45500‑413‑671 45530‑404‑305
CMSNL
14mm
1978 CX500 (DK,DM,SA) 45500‑413‑681
CMSNL
45530‑404‑305
CMSNL
14mm
1978 CX500 (DK,DM,SA) 45500‑413‑682 45530‑404‑305
CMSNL
14mm
1978 CX500 (E,ED,F,1G,2G,IT) 45500‑415‑611
CMSNL
45530‑415‑610 15.8mm
1980 CX500A (DK,DM,SA,U) 45500‑415‑761 45530‑422‑315
CMSNL
15.8mm
1980 CX500A (E,ED,F,1G,2G,IT) 45500‑463‑601 45530‑422‑315
CMSNL
15.8mm
1981 CX500B (DE,E,ED,F,1G,2G,IT,U) 45500‑445‑631 45530‑MA5‑671
CMSNL
15.8mm
1979 CX500CZ Custom (CM)
(serials to 2012063)
45500‑449‑671 45530‑442‑305
CMSNL
14mm
1979 CX500CZ Custom (CM)
(serial 2012064 and above)
45500-449-672 45530‑442‑305
CMSNL
14mm
1979 CX500CZ Custom (DE,E,ED,F,1G,2G,IT) 45500‑463‑611
CMSNL
45530‑422‑305
CMSNL
15.8mm
1980 CX500CA Custom (U) 45500‑463‑651 45530‑422‑305
CMSNL
15.8mm
1980 CX500CA Custom (CM) 45500‑449‑771 45530‑422‑305
CMSNL
14mm
1981 CX500CB Custom (CM) 45500‑447‑731 45530‑MA4‑671
CMSNL
14mm
1981 CX500CB Custom (DE,E,ED,F,G,G2,IT,U) 45500-MA5-671 445530‑MA5‑671
CMSNL
15.8mm
1982 CX500CC Custom (CM) 45500-447-731 445530‑MA4‑671
CMSNL
14mm
1982 CX500CC Custom (DE,E,ED,F,G,G2,IT,U,ND) 45500‑MA5‑671 45530‑MA5‑671
CMSNL
15.8mm
1979 CX500DZ Deluxe (CM) 45500‑415‑771 45530‑442‑305
CMSNL
14mm
1980 CX500DA Deluxe (CM) 45500-470-671 45530‑442‑305
CMSNL
14mm
1981 CX500DB Deluxe (CM) 45500‑MA4‑672 45530‑MA4‑671
CMSNL
14mm
1982 CX500EC Sports (Front) 45500‑445‑631 45530‑MA5‑671
CMSNL
15.8mm
1982 CX500EC Sports (Rear) 43500&#8209MC7‑006(superseded by
43500‑MC7‑016)
43520‑461‑771
CMSNL
14mm
1982 CX400EC Sports (Front) 45500‑445‑631 45530‑MA5‑671
CMSNL
15.8mm
1982 CX400EC Sports (Rear) 43500&#8209MC7‑006(superseded by
43500‑MC7‑016)
43520‑461‑771
CMSNL
14mm
1983 CX650ED Eurosport (Front) 45500‑MG0‑611
CMSNL
45530‑MA5‑671
CMSNL
15.8mm
1983 CX650ED Eurosport (Rear) 43500&#8209MC7‑006
(superseded by
43500‑MC7‑016)
43520‑461‑771
CMSNL
14mm
1983 CX650CD Custom 45500‑ME8‑672 45530‑MA4‑671
CMSNL
14mm
1982 CX500TC Turbo (Front) 45500‑445‑632 445530‑MA5‑671
CMSNL
15.8mm
1982 CX500TC Turbo (Rear) 43500‑MC7‑016 43520‑461‑771
CMSNL
14mm
1983 CX650TD Turbo(Front) 45500‑MA7‑026 45530‑MA5‑671
CMSNL
15.8mm
1983 CX650TD Turbo (Rear) 43500‑MC7‑016 43520‑461‑771
CMSNL
14mm
1981
1982
GL500 Silverwing 45500‑447‑732 45530‑MA4‑671
CMSNL
14mm
1981
1982
GL500I Silverwing Interstate 45500‑MA5‑672 45530‑MA5‑671
CMSNL
15.8mm
1983 GL650 Silverwing 45500‑MA5‑672 45530‑MA5‑671
CMSNL
15.8mm
1983 GL650I Silverwing Interstate 45500‑MA5‑672 45530‑MA5‑671
CMSNL
15.8mm

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