I'm having the same issue right now, i've installed stainless steel brake lines from J&M, my mechanic said they send just enough line to do the job but that the oem ones were longer.
So i'm thinking that might be the issue with my car. I'm taking the same advice and trying the grease.
2007 Mustang GT, Borla LT Headers, O/R X-Pipe, Borla Stingers, C&L CAI + SCT Brenspeed 87 Octane Tune, ATI Super Damper, 18" GT500 SVT Wheels on Nitto NT05R's, Dynotech One-Piece Aluminium Driveshaft, BMR LCA's, BMR UCA, BMR A-Arms, BMR K-Member, TCI 3500 Stall, Ford Racing 62mm Throttle Body, Ford Racing Intake Manifold, Comp 127200 NSR Cams - 15" Racestars Front & Rear at the track - Hoosier QTP's 28 x 11.5 / 26 x 10.5
2005 Nissan 350Z