Hi all, i recently purchased a land rover series 2a 1967, lovely car - needs some tlc but goes well. unfortunately it doesn't stop so week! the brakes don't work. when i depress the brake pedal it stays down and the brakes work for a bit and then stop working - quite disconcerting. The slave cylinders all appear to be working ok and i suspect the problem is in the servo or the brake failure valve. Has any one experienced something like this before. Any help valued before i start stripping the whole system.