Brake Booster Grabbing
My old '84 2.3 Ranger 2WD had a vaccuum leak at the brake booster (and it froze solid in the winter due to moisture). So I found a used one which looked good. Installed, no leaks, stops truck. Great.
• Most times when just lightly touching the pedal, the booster will grab the pedal and apply the brakes with moderate force, and then slowly release.
• At other times the brakes will apply normally, but the pedal will not return on its own - needs a toe to pull it up and free the brakes.
What would cause the booster to draw down the pedal, or to hold it down? I'm pretty sure I installed it properly. Do I need a new booster, or could there be another cause? My mechanic is stumped too.