1973 ZO7 package

[Michael W.]

I've entered into correspondence with a gentleman who is presently restoring one of the 45 cars built with RPO Z07 in the 1973 MY. The rear J56 calipers are still present as are the front caliper braces. The tank sheet specifies ZO7 so this appears to be the real deal.

The question is whether the car should have an adjustable proportioning valve or not. Presently there is a standard distribution valve and switch which appears to be undisturbed from factory build. The AIM addresses the J56 calipers but does not appear to mention the valve.

Which is correct?

Thanks.

[Edward J.]

Re: 1973 ZO7 package

Mike, I would think the General would not want to be Liable for something as a adjustable brake system. It would seem risky.

[Michael W.]

Re: 1973 ZO7 package

Mike, I would think the General would not want to be Liable for something as a adjustable to the brake system. It would seem risky.

Previous years w/J56 had an adjustable valve.

[Edward J.]

Re: 1973 ZO7 package

I guess my theory is blown to h____.

[Joe L.]

Re: 1973 ZO7 package

Previous years w/J56 had an adjustable valve.

Mike------


Not quite. The adjustable proportioning valve was used for 1966-1968 J-56 brakes. It was dropped for 1969 and later. So, no 1973 ever originally was equipped with one.

[Michael W.]

Re: 1973 ZO7 package

Mike------


Not quite. The adjustable proportioning valve was used for 1966-1968 J-56 brakes. It was dropped for 1969 and later. So, no 1973 ever originally was equipped with one.

Thanks Joe.