I just replaced my brake booster on my 74 Dart and now the pedal gets sucked in as soon as i start the car. As i push on the accelerator the brake pedal releases a little, but when i just let the car idle it has a rough idle and then the car dies.
Can someone help me fix this issue?

 

Sounds to me like they forgot to reinstall the spring in the booster during the rebuild?

 

Yup thats what it sounds like from here in NY...Bill

 

yea, faulty unit. where did you get it?