have filling the master brake cylinder daily but I can’t see any leaks around it. Truck as close to 200,000 miles
OK , the fluid is going somewhere but no one on the web can see the leak. So just put this in the shop before you crash in to someone.
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If you don’t see any leaks anywhere, my guess is the master cylinder is leaking into the booster.
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If you disconnect the MC from the booster, you can pull it away a little bit even with the pipes connected. See if there’s fluid coming out the back of the MC or pooled up in that area.