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You didn't say whether it was front or back . I had a similar problem with a rear wheel brake . The old grease at one of the rear brake cam SHAFTS was causing a tightness or a bind . I disconnected the brake rod on the effected rear wheel to feel for the bind at the rear brake lever . I removed the grease fitting and sprayed in some penetrating oil to soften the old grease . After washing out the old grease , I installed a new grease fitting and greased the shaft . works good now . Just a thought .