OK so I have gotten a lot of questions about the brakes that I'm running on my F, so i figured I would do a write up here.
I cant take the credit for figuring this upgrade out. A friend of mine told me about it (geeto67 here and on other sites).
The basic idea is to take the Honda OEM twin piston calipers off of a 1982 CB900F and mount them on a 1977 or 1978 CB750F.
These DOHC calipers have twin 30mm pistons and also let you run better pads.
The pistons and seals are available from honda to rebuild them and are not expensive to rebuild.
Another great part is they bolt on!
And look great
Here is what you need to do the FRONT
137905-001 left bracket
137515-001 right bracket
139361-001 left caliper
137472-001 right caliper
You can cross reference these part numbers to a few other bikes if you really want to dig through eBay.
Of coarse you will need the sliders and bolts for those calipers and brackets.
The install is very simple, the brackets from the DOHC bike bolt on to the SOHC bike using the stock SOHC mounting bolts.
SOHC left DOHC right
Mounted to the legs. There are no shims needed as the spacing is perfect
Then you just install the calipers.
Im running braided lines for a stock SOHC CB750F and a CBR600F2/3 front brake master cylinder.
I feel that in order to get the most out of the upgrade you need to change the master.
You can look at the chart in the link to help figure out the master that you need for your bike and riding habits.
http://www.vintagebrake.com/mastercylinder.htmHere is what you need for the REAR
143578-001 Bracket
143471-001 Caliper
Again you will need the sliders and bolts to attach the caliper to the bracket.
This again is a relatively simple bolt on upgrade
The bracket takes the place of the stock SOHC bracket
Stock but im sure you know what that looks like
DOHC bracket bolted on
Some of the DOHC brackets seem to have a casting "bump" that interfere with the rotor. Simple fix is to grind this bump flat and then there is no interference with the disc. The spacing is perfect so there are no need for spacers or shims
The bracket arm bolts up to the stock arm using stock hardware.
I decided that a taller reservoir would help with, but I honestly do not know if its needed.
Another reason that i changed the reservoir was because mine was old, faded, and ugly. The original one is not available.
As for pads I went with EBC HH rated FA69 pads
There are a few different options with FA69 pads, some are just a tiny bit thinner or thicker then others.
The OEM parts that were used on this upgrade can be found on eBay for very reasonable prices.
I will add that through a mistake on my end I found out that a different Honda caliper works.
My calipers are off of a V65. The V65 calipers are 32mm twin piston. They will bolt on to the 1982 brackets.
If you want to run a 32mm rear then you need to get a second right hand V65 caliper to use on the rear.
I have found that the tabs that hold the brake lines center are missing on the V65 calipers but that does not effect how the lines bolt on, it just makes you have to hold the line while tightening the banjo.
Well that does it for the upgrade.
If anyone has any questions feel free to ask
