quote:I thought one of the recommended changes for ALL Pantera brake systems was to remove the shuttle valve.
There is NOTHING to be gained by removing the shuttle valve. But you WILL lose the safety factor it provides. The sliding piston can be a problem when bleeding the brakes as I outlined, but one easily avoided.
I can see no reason to remove it other than some need for a cleaner look.
Now the stock fixed proportioning valve MAY still be functional in some cars - most are probably so varnished up as to be NFG - but they were only calibrated for the stock set-up. Any changes to the brakes render it out-of-sync with the rest of the system.
So with the exception of a well-maintained stocker, I'd say toss the proportioning but retain the shuttle.
Larry