Mountain bike related question but principple can equally apply to motorcycles and cars.
Let's say you have one arm and want to have one brake lever to operate both front and rear hydraulic brakes.
Just like in motor vehicles, the majorty of the braking is done by the front wheel(s) so you don't want to be locking up the rear end each time
the brake is applied.
There is no bias bar so bias has to be done by caliper piston diameter.
Should the diameter at the rear be bigger, the same or smaller diameter than the front one?
Or some other way such as fitting restrictor* in the rear brake hose?
* by this I mean some means of reducing the dameter of the brake hose.
Rear caliper needs to be smaller. Reducing diameter of hose has no effect.
Davie
Or get one of those old fashioned drum brakes that applies the brakes when you pedal backwards
rear disk should be smaller diameter if you want less braking at the rear. (torque is force times distance from axis. The force is the frictional force between pads and disk)
quote:
Originally posted by daviep
Rear caliper needs to be smaller. Reducing diameter of hose has no effect.
Davie
quote:
Originally posted by 02GF74
quote:
Originally posted by daviep
Rear caliper needs to be smaller. Reducing diameter of hose has no effect.
Davie
ok, so I have misunderstood how these pressure proportioning valve devices work -
these:
how do they work - spring loaded valve that changes size of orifice through whcih the fluid flows?
Why would you want them on the same circuit? Surely the ability to inifintely adjust your bias on the fly and whilst braking is worth keeping!! I know how much you use it on a motorbike, so can only assume a mountain bike is the same?
quote:
Originally posted by speedstar
Why would you want them on the same circuit? Surely the ability to inifintely adjust your bias on the fly and whilst braking is worth keeping!! I know how much you use it on a motorbike, so can only assume a mountain bike is the same?
quote:
Originally posted by 02GF74
Let's say you have one arm ....
To do it with one lever you'd need the rear disc or piston to be smaller, or both. given variable grip surfaces though and undulations off road
it'd be very difficul to stay in control.
I've raced with a few one armed guys on the road (and on the velodrome but threre's no brakes there!). The usual way they do it on a raod
bike is both brake levers mounted on one side. One pointing down in the normal position and the other fitted upside down pointing up so the tips of
the levers are almost touching.
Whats needed a a simple light anti-lock device, only thing I can come up with is viscous coupling between the rear wheel and the disc.
I just found the patent for the above ---- not impressed.
can you post the link to the patent, I'm interested to see what's in the box,..
thanks