Hi Grassroots, Wesley here from Animagraffs.com – I've created a web page with graphics to explain the difference between disc brakes and drum brakes, and while I've done my best, I know my research will have flaws. My projects get a lot of attention online and I hate the idea of putting bad info out there!!
I was wondering if you could give it a quick read over, and let me know what I need to fix, and what I've gotten wrong?
(Side note: the final product will be animated 3D models instead of still images, for better viewing)
Here is the project for review (pre-release, for your eyes only): 
The anchor pin in the drum brakes is wrong for that wheel cylinder setup. There is no pin, the shoes push against the wheel cylinder only.
Nope, there is a pin. that is what the notch in the shoe is for.
The rotor provides a friction surface and is also a heat sink. The airflow is usually from the center of the disc to the outer edge, and not all discs are vented. If discs are used on the rear of the car, they're often solid.
Don't forget multi-piston calipers, they don't slide but instead have one or more pistons for each pad.
Fun fact about drum brakes - the torque from the pads dragging on the drum causes them to press harder against the drum. They're self-energizing. This also means they don't work very well in reverse, which is important if you have an old Land Rover and take it rock crawling in Moab. I believe drums also require less line pressure than discs.
In the drawing he's showing, the wheel cylinder is the holding force. Other setups of a dual servo linked brake will cock against the pin, particularly if they have a floating hydraulic cylinder. But with the shown unit, the hydraulic piston on the rear cylinder is what the shoe will be pushing against when deployed.
it's cool and all, but didn't howstuffworks.com do this same thing like 15 years ago?
You should probably note that the automatic adjuster mechanism commonly found in the drums are not shown.
Under the disc side of the parking brake section, I'd only suggest adding language like "If a car has disc brakes on the rear, then they typically have a mini version of a drum brake..."
There have been plenty of all-disc cars that did NOT have a mini-drum parking brake, but rather had a mechanism in the disc brake calipers to provide the function.
