Wouldn't place too much faith in a machine sold by a seller who has Mk1,2,3 Capri in "Mast-head" and then has 5 pages of all the Volkswagens it's meant to fit in the body of the ad ! ............even if it's 100%, and the $1000 odd dollars was no barrier, why not keep it simple with an "ADJUSTABLE" BIAS brake VALVE fitted to the rear brake line ? ($100-200 max and much easier to fit with 90% less complications) ...........SIMILAR to the unit fitted on most cars/trucks/vans since 1972, that varies in line with body to rear axle vertical movement and pay-load weight added or removed
HAPPY NEW YEAR ALL !