First you need to remove the wheel and drum to access your brakes. Then you need to remove your brake shoes to. Check for brake fluid accumulating at the bottom of the bore or for fluid dripping out of bore as boot is pulled back.
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If brake fluid is dripping from the brake wheel cylinder or if the brake shoes are wearing unevenly the wheel cylinder needs inspection. This is an example of a wheel cylinder that has failed and is leaking. Wheel cylinders can also seize up, inspection for this is also.
If either is found wheel cylinder replacement is in order.
Consequently, repairs should be made immediately if a wheel cylinder is leaking fluid. This can reduce braking efficiency and pose safety risks. Making repairs to your wheel cylinders is pretty simple. Because of this, you’ll have to add brake fluid all the time.
If the leak is coming from within a wheel, then you may have to remove the wheel to. Crawl underneath the car and look for the spot where fluid is dripping from the brakes. By inspecting the brake components, you can identify any issues early on and prevent more severe problems from occurring. One of the first symptoms of a bad drum brake cylinder that you’ll easily notice is a low brake fluid level in the container.

This video will show how to inspect for leaks.
Brake fluid leaking from the rear wheel can signal problems like damaged brake lines or a faulty wheel cylinder. Here's how to inspect a drum brake wheel cylinder easy. While removing the wheel is the most thorough way to.