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Cali EV rear brake proportioning valve spring broken

Mackers

Cruisin' Guzzisti
GT Contributor
Joined
Oct 27, 2008
Messages
284
Location
Victoria, Australia
This spring on my '02 EV is broken. How important is it? Rather than get a replacement on back-order from Italy, is there any other spring that I can use?
 
Sure, but will it work properly? I'd go with no spring until the correct one can be found, and be gentle on the foot brake.

Interestingly, the Cali Vintage never had the spring, just the proportioning valve.
 
I ran my 03 EV for some time with the spring broken before I found the break. In theory, it is supposed to change the proportioning rate as the front end dives, but it doesn't seem to make much difference with the spring or without. So run without until you decide to install a new one.
 
My understanding is the spring only affects the amount of pressurized brake fluid getting to the rear brake, and is reduced when the swinging arm is hanging lower, i.e. as when the rear is raised due to a large bump. This reduces the chance of a rear wheel lock up.
 
My understanding is the spring only affects the amount of pressurized brake fluid getting to the rear brake, and is reduced when the swinging arm is hanging lower, i.e. as when the rear is raised due to a large bump. This reduces the chance of a rear wheel lock up.

The swing arm will move lower in relation to the frame under braking as well as weight shifts to the front. I could actually lift the rear wheel on my EV under heavy braking, not very far, but folks could see daylight under it.
 
The swing arm will move lower in relation to the frame under braking as well as weight shifts to the front. I could actually lift the rear wheel on my EV under heavy braking, not very far, but folks could see daylight under it.

Yes, and in this situation, the pressure to the rear brake is reduced to avoid the possibility of lockup.
 
Yes, and in this situation, the pressure to the rear brake is reduced to avoid the possibility of lockup.

Correct in theory, but I never could feel any difference with the spring in place or not. That said, once I saw that the spring had failed, I did install a new one.
 
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