TerryG wrote:Looks like just an attempt to provide cooling to the brake. The cam pivots are on the backing plate, not the drum. I would go with holes drilled in the backing plate - not weakening the wheel with cutouts.
Lmo wrote:On back, they should be moving at the same time since there is only one brake cam.
On the front brake they should also be moving at same time, allowing for any slop in the connecting link between front and back brake cams. I fitted my front brake with Suncor turnbuckle to remove the slop, so they move simultaneously.
On my BMW R75/5 front brake, one shoe touches first because the internal springs are different of "rates". Not the case for Ural, right?
URAL CT wrote:Here's my thinking: when the cam engages (ya step on the foot brake) the bottom part of the brake shoe touches the hub first, then the top section engages the hub. Opens like a clam shell, It's pivoting from the bottom shoe where the cam is. The movement is very slight, if properly adjusted. The brake springs keep the shoes in place.
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