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Some master cylinders have a check valve located down at the output end of the cylinder , the end where the brass union for the pipes is located. The theory of the valve being there: it is to provide a small amount of permanent pressure in the hydraulic system. In your case, the little amount of permanent pressure might be enough to turn the brake light switch on.
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1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad
Last edited by Mike K; 08-03-21 at 03:52.
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