Hi Baz,can only speak as I find and as posted the effort of each wheel is gained by a certain amount of effort applied to the pedal to give four different readings,it may not need any type of valve at all if the brakes are ok and these discussions have been food for thought for one and all.
If fitted with Sierra valve expect a decelerometer to be used,if not it will be static test.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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