Pretty sure the drill is it needs revving to start pumping up the rams, the pump will be at its minimum pressure at tickover, it makes sense to me it would work better at driving speeds

There isn't that much fluid system in the system normally, maybe if the spheres are ruptured and full of oil it could slow it down even more?

Plus I reckon it needs more than 120kg to actually get the rear end down enough for the sls to kick in....unless I weigh a lot less than I think!

Have you tried taking off the adjuster and moving the lever directly at the sls valve to test that works ? - bear in mind previous cautions lol

cheers!

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cheers!!