i sorted it out ,,,completely flat rear spheres, it was using the ctr sphere untill i hit any reasonable bumps then the ctr sphere locked out , no suspension then half a second later bang it jumps up as the ctr sphere comes back in, ive temporrarily usd two old front spheres they are working very well considering the ones i took off were stamped 35bar ano the ones i put on are stamped 50bar just the brakes to sort now as there is now and then a slight delay, whitch i think might be the acumulator sphere , terry