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Check the master cylinder barrel assembly isn't over-adjusted (screwed too far into the casting see AP Lockheed manual, link, below) or a blockage but I suggest you also strip the master cylinder and check it for corrosion as the bike has been standing for several years. Preferably renew any old rubber hoses.http://www.classicbike.biz/Triumph/Maintenance/LockheedBrakes/Lockheed_Hydraulic_Brakes_Triumph_Norton.pdf
Check the master cylinder barrel assembly isn't over-adjusted (screwed too far into the casting see AP Lockheed manual, link, below) or a blockage but I suggest you also strip the master cylinder and check it for corrosion as the bike has been standing for several years. Preferably renew any old rubber hoses.
http://www.classicbike.biz/Triumph/Maintenance/LockheedBrakes/Lockheed_Hydraulic_Brakes_Triumph_Norton.pdf