When I add brake fluid, it leaks out.
First off, I would avoid driving this vehicle until this problem resolved. The brakes have two hydraulic circuits in case one of them fails, but if one circuit is only braking for two wheels and the brake pedal will be very low. A qualified mechanic from YourMechanic can come out and locate your brake fluid leak and make the repairs that are needed to get you safely back on the road.
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