Great question — answering as the UphillTech team:
Generally speaking it is possible. But you should also make sure that the pistons on the rear caliper are not pushed out too much which could lead to possible oil leak, usually but not necessary when the brake pads are too worn (say less then 0.5mm). I had lots of leaking problems with one of the Shimano brakes in the past, and like you I couldn't identity the problem. You could start by replacing the brake hose with the new one, which should help narrow the problem. Other than that the canister cap on the brake lever knows to give problems sometimes. Make sure the cap is well tucked in in the right place, also don't forget that there is usually a small piece of thin rubber between the...
Full answer by user8409: https://bicycles.stackexchange.com/a/18092 (CC BY-SA 3.0).
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