I have a 1977 chevy caprice classic that is leaking brake fluid from rear tire,can you tell me the cause?

If you have no evidence of leaking outside the drum, most likely your brake piston is leaking or the drive shaft seal is leaking. Pull off the drum and look for the piston which spreads the two brake pads normally situated at the top. Inspect for leaks. If the fluid is thin, it is most likely brake fluid. If it is heavier like oil and really stinks, it is gear oil from a leaking seal.

You will need to replace the line.

You probably need to replace your brake pads. They are what queezes your tires to get them to stop. If your brake pads are old, they can be worn down over time and become less effective at gripping the wheels to stop them. You press your foot all the way to the floor, but the pads are too thin to create enough resistance to push back.

USUALLY THAT HOW THEY ARE

Hello! One of the wheel sensors is probably defective ...They back themselves out of their mounting...Or the wheel hub reluctor is rusted...you have a couple of options...Pull the INDIC fuse (10A) from the interior fuse box turning off the light...Power down the EBCM by pulling the PCM/IGN fuse # 5 (30A)...Drive and see if you notice any ill effects...If not, the ABS is disabled...

Wheel Sensors are; Left Front...Right Front...And Rear Axle...Guru...Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Look for wires hanging, near the tire area under the car. An ABS sensor wire may be broken or the sensor is damaged.
Getting the system scanned will tell you exactly what is going on.

u probably have a leaking fuel line!find wich line is leaking and replace it

remove the rear tires and the brake drums and check and see if the wheel cylinders are leaking

IT NEED TO BE SERVICED. SECTOR SECTION IS WEAR. HURRY!

low power steering fluid
worn out steering box
bad power steering pump