Topic: Calliper Identification Please

[rickman750]

My K2 has a strange front end on it. Can you identify the bike this calliper comes from? Front end is twin disc. Only the bleed hole is visible. The brake pipe enters the calliper at about 45 degrees pointing toward the wheel.

[Tetter]

Looks like the CB750 K7 / F1 caliper.

[bryanj]

Yup but confirm it by measuring the diameter of the piston as the later ones were bigger, also not easy to get

[rickman750]

Thanks team! K7/F1 is close enough, I think.

I notice the calliper in Tetter's picture has a banjo bolt fitted. The callipers in my pic have a flair pipe fitting. I'd rather a banjo fitting. Is it simply a matter of drilling out the flair bits at the bottom of the bolt hole?

[Bodi]

No drilling required. Thread a self-tapping screw into the flare insert and pull it out. The thread is a standard banjo bolt spec but NOT the size Honda brake banjos use. I don't remember the exact thread sizes.

[scottly]

1+ on threading a screw into the flare seat to pull it out. The banjo is the same thread as the one used on the Honda MC, but I had to shorten them a bit to keep them from bottoming out. I also milled the surface where the crush washer seats to give a clean, flat sealing surface.
Be aware the the 550 calipers are similar in appearance to the K7/F1; 550s have a 38mm piston, while the late 750 are 42.7mm. The bolts that hold the caliper together are the easiest external clue: on the 750, they are 50mm, and somewhat less on the 550.
Measure the length of the lower fork leg from the axle center-line to the top (not the rubber dust cap). Early forks were 12.5", and late K forks were almost 14"   

[bryanj]

Other thing is that flare seat does not come out on a 500 caliper believe me i have tried

[rickman750]

~14" long sliders and 50mm between bolt centres. Looks like K7/F1. When it's not so cold, I'll do the self tapper trick!

Thanks for all the help!

Phill.