Claude
Too many issues one after the other can seem daunting but the best approach is to follow a logical elimination path.
Releasing the pressure after the servo allows the brakes to come off, so it's either the servo or the master cylinder that is holding them on, now that you've eliminated the brake line between the servo and the callipers.
So release any pressure between the master cylinder and the servo, simply by loosening a connection point.
If the brakes don't then come off it is the servo that's the problem, if they do then it's the master cylinder, or possibly the brake line between the master cylinder and the servo. To eliminate the latter try loosening a connection point at each end of that brake line
If it's the servo it's a case of rebuild or replace, I'd be pretty certain that there must be someone in NZ who rebuilds them, if of course you can find them.
If it's the master cylinder do just check that the brake pedal is free to return fully before you attack it.
My knowledge of V8 brakes stops at the 410 which uses twin Girling master cylinders, callipers and connectors but Lockheed servos (Lockheed 4258-405). I believe that the 411 is similar apart from the single master cylinder.
Roger
|