I recently removed the old rear brake cylinders from a 9.5" axle junkyard find, and I figured I would push the guts out of one just to see what's inside. I've never actually looked before.
Net net: Within the cylinder housing there are two metal pistons, each with a (rubber?) piston cup. In between was a spring assembly which pushed equally against the two piston cups to force them against the pistons and outward.
Not shown, because they're normally visible w/o disassembly, are:
- the rubber end caps / retainers that are typically visible on the ends of the cylinder
- the little "pusher-thingies" that actually stick out of each end of the cylinder and engage the brake shoes w/ the pistons.
Nothing complex here... but interesting just the same.
This cylinder's bore measured 1". It was from a JB6 11" drum 9.5" six-lug axle.
Net net: Within the cylinder housing there are two metal pistons, each with a (rubber?) piston cup. In between was a spring assembly which pushed equally against the two piston cups to force them against the pistons and outward.
Not shown, because they're normally visible w/o disassembly, are:
- the rubber end caps / retainers that are typically visible on the ends of the cylinder
- the little "pusher-thingies" that actually stick out of each end of the cylinder and engage the brake shoes w/ the pistons.
Nothing complex here... but interesting just the same.
This cylinder's bore measured 1". It was from a JB6 11" drum 9.5" six-lug axle.
Attachments
Last edited: