If you have the replacement brake differential indicator and hold-off valve (it is not supposed to be a proportioning valve) and you have not read the wonderful and very complete article post by Dave Lenzi, you should do that today and plan to complete the suggested mod as soon as it is possible (not just practical).

Executive Summary:
The Brass replacement parts are not correct for TZE at all. While they do the "hold-off", they also reduce the pressure delivered to the rear brakes. This is not something we need or want. The modification required to correct this looks simple enough. It can probably be completed with the valve in place, but I won't know that for a fact for a few days.

I will read the article again (probably several times) before I do the mod and mark the valve as done.

This annoys me because somehow I did not see the two issue of VR come into the house and so never read them. I am hoping it is just a silly mistake.

Matt