SOHC.co.uk Forums > CB350/400

Rear disc conversion

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Bryanj:
Just recently done the rear brakes on a triked GL 1500 which has a "linked" rear brake, front left caliper+rear and with one extra caliper(est 50% extra area) the rear pedal gets a lot more travel and feels spongey but isnt, cant upgrade the master as the consensus is the production line starts with therear master hanging on a piece of string and the bike is built round it!

K2-K6:
Very good work alankelly1 and seeing it as a whole with the others mods of rims, twins on front, seat etc, it fits in so well on your bike.

Comments on balance of systems, as already noted it's shifting the hydraulic reduction ratio that trims it. Competition car balance adjustment pedal arrangements use a mastercylinder for each the front and rear systems descreet from one another and balanced initially by bore size. Then by moving the fulcrum between the two it can give bias to front or rear depending on driver choice.

For a combined system on the bike, you could use a front mastercylinder (cable operated from pedal and hidden) but with a pass through line from front system that goes in a bespoke cap to reservoir.  This pushes the rear caliper along with the front brakes, but if you use the rear to operate the remote mc it seals the line from the front and just actuates the rear independently.  This is the arrangement used in rally cars for years as hydraulic handbrake setup.

allankelly1:
Hi K2-K6

Yes know the bias system well as had the same set up when I build my Dax Rush many years ago that has a twin master cylinders for front / rear brakes so you could balance the brake bias front to rear




For the bike just going for a independent rear brake system with a separate master cylinder for just the rear wheel

Much easier to set up and plumb

Catch up again soon and thank you for all the positive comments

Best wishes Al


Sent from my iPhone using Tapatalk

Spitfire:
Glad to hearv that you are balancing the braking, the rear disc on my 750F1 is definately too fierce, it's a better brake than the front one.

Cheers

Dennis

McCabe-Thiele (Ted):
I upgraded the rear brakes on my Cooper S back in the 1970,s no dual brake circuits on them at the time - the rear drums would lock up really easily after my rear wheel cylinder upgrade - ended up fitting an adjustable brake balancer to replace the existing fixed one mounted on the rear subframe. Worked a treat.

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