Brake Question

[shadowgray396]

It replaces the factory distribution block on the frame. Also since this is a '70 that you are working on that had rear drums brakes there may be a pressure hold back valve mounted back by the inside frame rail on the rear frame. Not sure on the Elkys if they had them, but 70 Chevelle had one hidden back there. GM did away with it with the combo valve used in model year '71 and up.

[zooming993]

Thank you for all the replies. I’m beginning to think this is going to be a bigger job then I planned. I understand the new proportioning valve (PV4) will replace the original distribution block mounted on the frame. As for the pressure hold back valve some have mentioned, I found it, it’s mounted on the drivers side above the axle tube. I’m assuming this valve needs to be removed when I install the rear disc brake conversion, correct? If it does need to be removed can I replace it with a threaded coupler or do I need to replace the entire brake line?

Thanks again for all your help.