Want to get a new power brake booster, 1973 Duster.

timk225 said
Well that's the thing, the brake pedal does not fully return on its own, it has an extra spring to help pull it that was clearly added in, not a factory part. That's why I think it may need rebuilt.

That’s more likely to be a pushrod length issue or a pedal bushing problem than a bad booster, IMO anyway