quote:the measure should not be just not locking up the rears, a good braking system should lock up the rears but just after the fronts.
I think for the most part we are all in agreement. Removing the proportioning valve alone (without making an improvement in the rear) may not be a good idea. BUT, with the rears improved the proportioning valve SHOULD be removed.
It is all about balance. Every car should be evaluated based on it own configuration (weight distribution, tire size, etc...)
When we decided to get into brakes be did A LOT of testing to backup what most are saying here. Some people forget that the proportioning valve is in the front circuit on a Pantera.
Bottom line is a balanced system will not require a proportioning valve. The quickest and cheapest method for a stock Pantera brake system upgrade is to remove the proportioning valve and upgrade the rear brakes. It is amazing how this inexpensive change provides dramatic results.