Originally Posted by NUTS RuS
Hydraulic parking brakes as a sole means of operation are not acceptable on vehicles first used on or after 1 January 1968.
Hydraulic brakes with auxillary cable are however accepted.
Hydraulic h/b's that even click and lock will still fail at any decent MOT station. They all lose pressure as the fluid cools and your car merrily rolls off down the hill. I have seen this happen SOOOOO many times to rally cars in over night parc ferme its comical - until one hits your car
Find a friendly MOT station


spot-on reply from Tony as always.
According to the MOT rules it will not be acceptable, but having a mechanical cable which "looks" like it operates the brake at the same time will be