Hydraulic drum brake

[nkt267]

Surely it's not impossible that the piston pulls the rod instead of pushing it, is it? Looking at where the fluid entry is it just might..john

 

[bmetcalf]

The adjuster on the right would easily work if the cylinder did pull.

 

[clevtrev]

It has to pull it, that`s why there is a flat on the spindle to the right.

 

[roy the mechanic]

There's a flat on the trunnion so that the synchronisation adjuster has something to butt up to.

 

[clevtrev]

There's a flat on the trunnion so that the synchronisation adjuster has something to butt up to.

Sure, but if it were pushing, how would it be assembled, if there was a thread in the spindle.

 

[roy the mechanic]

I figure it's a locknut. That's why it needs a flat to work.

 

[bodlan]

It's pulling the arms together. It is the infamous "comical hub" as on my '72 Bonnie. Normally cable operated and rubbish!

 

[ksbundy]

On an early Suzuki twin they had a hydraulic foot operated brake which operated both front and rear wheels. They also could operate the front brake by cable.
Ken

 

[Chris Launders]

Here's another version of the same brake on a Mead and Tomkinson race bike.

.

 

[bmetcalf]

This one is less obvious on how the shoes are spread, maybe wee cylinders inside? Also, assuming that is an endurance racer, the headlamp looks pretty small for 3 AM racing.