Luckily this happened in my driveway. I have a 69 charger Daytona recently restored and yesterday I took it out of the garage to show it to some visiting relative (We are finally de-confining over here...). Everything seemed fine. I kept the engine idling for about five minutes and then shot it off. Finally after about ten minutes I went to put the car back in the garage when I found it stalled when I normally released the clutch in reverse. Restarted the engine and got the car to backup but with seemingly a loss of power. When I shifted back in first my nephew noticed the front wheels were not turning but dragging. A modified 440 is not exactly what I would call a wimpy engine but the clutch was smoking when I finally got in the garage. Upon lifting the car I found the front disk brakes totally locked up and impossible to move and the rear drum brakes barely turning in reverse direction and not at all forward. Brake pedal felt hard but would still move down. Brake fluid level for both front and rear did not move. Needless to say that the restoration included all new parts from the master cylinder to piping, distribution block, rotors, calipers, drums and all drum brake parts. Oil is new all over. The most recent change before this happened is a new distribution block (See pictures) because the original one was leaking through the bottom plug and I could not find a replacement part (Again look at the pictures to see size difference between original and new block. The old block plug had a cylindrical leather type seal that dried up over time and could not be replaced). Other than this, the brake power booster is original, worked fine and did not require a change. Anyway, let the car cool down a few hours and then found that the brakes were free again. Could the lockup been caused by the distribution valve in the new block (I believe this split brake pressure to 60% front and 40% back to avoid locking up the rear drum brakes when equipped with disk brakes in front)? Or else like someone suggested on the Net a faulty brake booster check valve? Any help would be greatly appreciated.


Problem solved! Turns out the culprit was the master cylinder side brake booster push rod that was out of adjustment. Four years ago when I started the reno I sandblasted the brake booster (external of course) including the protruding rod. I then put some "never seaze" on the adjusting nut threads. Bad idea it seems as the nut moved out of adjustment and was preventing the complete release of brake fluid pressure in the system up to the point where the wheels locked up. Removed the master cylinder (it actually popped out when I loosened the last nut), cleaned the threads with acetone, readjusted and "Voila!" I'm back in business.

 

https://dodgeforum.com/forum/charger...d-superbee-48/