Hello everyone, I'm new to the forum (and the hobby) and would like to thank you all for the vast information I've already absorbed through the site. I recently purchased a '63 riviera in original condition. When I first drove it, applying the brakes caused a strong pull to the right side. I have replaced wheel cylinders, shoes, hardware on all four corners, as well as soft brake lines and master cylinder. After bleeding the system, the brake pedal is nice and strong until the car is started, at which time all pressure to the pedal is lost. The booster may need to be replaced as well, but I don't want to just throw more money at it without reason. I'm hoping I've just overlooked something. Thanks, -Adrian-