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Brake Fluid RFeservoir Leak- '86 245 200 1986

Sorry about the brake problem.
I also have '86 245 and it too was leaking from the master cylinder reservoir.
After replacing the whole master cylinder I was still having brake problems. It turned out to be the brake failure detection valve which is under the driver side wheel arch on the 86. This has 6 brake lines connected to it and it is common for the brake failure sensor to leak. This would explain your brake failure warning light coming on.
The other possibility, which is a bigger problem, is that sometimes master cylinders leak into the servo-assist brake booster. Left unchecked this will damage the brake booster which is an expensive item.






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