Tomadam

Just got a 1984 yota hilux lifted with loggers box... I live on the coast so lots of steep hills, anyway took it for a rip up some logging slashes about 8 km by the time I got to the top brakes were better than ever but on the way back down I lost them the peddle went right to the floor and nothing happened... if I pumped it I could get enough pressure to slow down but not stop. And if I took my foot off the pressure was gone, managed to get home and sat for 30 mins and they were working like normal, the brakes have been ˟˟˟˟ty since I got it, about half the peddle before something happens on a good day.
Cheers
tom