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I have removed them. They are pressure limiting valves set to around 800psi, I can't remember exactly, but it is different between 142,144 & 145. Also, this pressure would corespond with the available grip of 1970 model tyres & todays would have far higher grip than those from 30 years ago.
When I removed them, ten years ago, I was racing dirt hillclimbs & autocross & I was hoping for the rears to lock up on 3-2 downshift to get some more turn-in, but I never did.(Diff was a 4.56 ratio welded locked) The car today has an open diff & the rears don't lock up. I've never had any adverse pad wear either.
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