Linked brake question

I just learned today that when I apply the front brake it also actuations one of the rear brake cylinder, not only the other way around. But a stationary test shows that the rear wheel is free of rotation when I apply the front brake. So the question is does the bike need to be in motion for the linked brake to work? I assume when the front wheel is rotating the left caliper will be also rotated slightly by the friction force when I squeezing the brake level, it doesn't move when I do it in stationary.

 

AFAIK the linked brake system is purely mechanical, i.e. no other inputs other than the brake levers.

 

Someone smarter than me will likely know better but I have a feeling the front brake needs to be applied for a specific length of time before the pressure has built up enough to activate the rear brake. I could be wrong on this though.

I would also say it's not uncommon for these bikes to have the brakes de-linked by some owners so that's a possibility too, though that should be fairly obvious if you check the brake lines Vs what stock ones look like.

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Thanks for your input, holding the brake lever longer doesn't apply any braking force on the rear wheel. The braking system is all stock, actually I just bled it a couple of weeks ago. I remember I pumped the rear brake pedal to bleed the PCV until the fluid was clear and no bubble.

By looking at the brake system scheme, the PCV system is not directly connected to the rear or front brake fluid reservoir, so I guess when pumping the rear pedal, fluid was drawn into the PCV lines from the rear caliper.

 

Great! That's what I thought, but I can't put it into test. I can't imagine the caliper tilt itself while parked, only the torque from the friction can rotate it in the right direction

 

Compress the "linked master" that is attached to the front left caliper with your hand while the bike is on the center stand and you will be able to tell if it is putting pressure on the rear brake caliper or not.

 

Tried and worked! Don't really need the linked system but at least it works as designed.

 

If you replace the simple rubber front brake lines with braided stainless, it transforms the feel of the linked system.

Jose