First Generation Ascots > Tech Section

front brake master cylinder

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AwL:
Piston bore diameter is 14mm.  Here's link to the one i got:
https://www.ebay.com/itm/Honda-CX500-CX650-FT500-GL500-Ascot-XBR500-CB250-CB450-650-Brake-Master-Cylinder-/271183213152

J6G1Z:
Please let us know how well it works after you test it.

Thanks
J.

triguyracer:
14 mm piston bore is the right size for a single disk, Dual disks will have a larger bore to move more fluid ,going to a smaller bore on a single disk will increase the firm ness on your lever up to a point,12 mm seems to be the lower limit for a front brake ,some bikes there rear master cylinder will be as low as 10 or 11 mm bore size,your 14 mm is just  about right for most applications for a single disk, it should be firm without excessive lever travel,by going to a larger than 14 mm bore size you will increase lever travel and your lever will have a softer feel as you will be having to move more fluid,16 mm is a dual disk size   

AwL:
Yes that one i got from ebay works just fine and does have the 10mm bolt hole for mirrors

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