[V8 Bob]

Originally Posted by KULTULZ

Can we agree on restricted flow as pressure increases at the knee point?
No. The pressure is reduced to a percentage of master cylinder output. Has nothing to do with flow.


GM did use a PPV on some all drum applications. Makes perfect sense to me. But ABS has changed all of this.

What I am trying to point out is that the ill-conceived notion that an ADJ PPV will correct all situations. That is why they are not approved for the street. Their function is race car only.
Using an ADJ PPV may not correct all situations, but is a better alternative to a fixed value PPV designed for an entirely different vehicle and/or brake system. ADJ K/H PPVs were used on some mid-'60s Lincolns/T-Birds---my '32 and '40 both have one. Technically, any non-stock factory brake system or component is probably not "approved". Preventing early rear wheel slide is the important goal, period.



Some of these so-called "BRAKE KIT SELLERS" are dangerous (IMO).
Most have improved their "tech" over the years, although a couple still need improvement. What's more troubling to me is the lack of basic brake system knowledge obvious on most forums, especially dual systems, that have been around for almost 60 years!




INFO SOURCE BELOW - https://www.brakes-shop.com/brakeped...tioning-valves

^^^