My 1973 1 1/2 ton dump bed looses all the fluid in the master cylinder, it happens every couple of months and I cant find it leaking. I will say the master cylinder is rusty on the outside, but no signs of leaking and the brakes work great. I have looked at each wheel and in the cab as well as under the hood. The truck sits most of the time. I think it is either evaporating or leaking threw the walls on the master cylinder. One more thing where can I find a new master cylinder? It is a single bowl reservoir cylinder.
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