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1948 LC Convertible Power Windows

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Check the fluid level in the pump reservoir. Test the fluid to see if it is brake fluid. If it is, flush the system and refill it with fresh brake fluid. This should be done every year according to the shop manual.

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Brake fluid is not good for paint, and the system can be changed over to hydraulic fluid after a complete flush with denatured alcohol. I would also go the extra mile and have the seals in all of the hydraulic cylinders replaced. Then you will have a nice reliable system to operate your seat, window and top.


You can also just flush the system every year and fill it with fresh DOT 3 fluid. Your paint is safe unless you develop a leak from rusty lines or worn out cylinder seals.

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