Brake System light revisited

gregcon said
Is the master cylinder the right type? Does the car have the proper hold-off valve as used on the disc cars of that year? This is a smaller brass block, independent of the main prop valve.

In the 67 to 70 something KH front disk brake system.

There is a distribution / brake warning block. It's only function is to distribute the front and rear brake fluid and alert if the system is unbalanced.

The proportioning valve is down stream of the distro block and a separate unit.