Ive just had this on mine after putting it back togther after having the pump off for a while! With mine it was the pump not pressurising the oil so i took the pump apart and all the little vains where stuck i cleaned every thing up oiled it and now its fine! also managed to kink the high pressure pipe that go's from the pump to the rack so had to cut that out and braze in a new section as there was no way i was paying 40 quid for a second hand one!