I hope I explain things okay and I'm wondering if I could get some help here with my brake troubles. I have front discs and rear drums that worked OK in the past, but I did an overhaul because of extensive rust with a new CityRacer Brake Booster, a refurbished (by me, an amateur, with a kit) 75-80 brake master cylinder, a refurbished proportioning valve, and new brake lines. When I put everything together, bled them, and started the car, the brake felt very firm then suddenly gave way with a "pop" and is now very soft. It does not stop the car and I don't see the front discs even engaging when the brakes are pressed.
I tried bench bleeding and the rear reservoir kept getting air bubbles. There seemed to be a small leak at the proportioning valve, so I tightened up all the bolts/screws around there and the bubbles are less but still there. Front reservoir bench bleed went fine. Then I bled the brakes again, which was OK overall but the rear right seemed to also get bubbles more than the rest. Still soft brakes with 0 braking power. Also to note, I may have a vacuum leak because whenever I press the brakes it revs the engine slightly, but I couldn't find the leak with a smoke test.
My next step is just keep on bleeding the brakes, but anyone have any other thoughts on it? Could I have destroyed something in the booster when it popped? Or maybe one of the seals in the brake master cylinder?
I tried bench bleeding and the rear reservoir kept getting air bubbles. There seemed to be a small leak at the proportioning valve, so I tightened up all the bolts/screws around there and the bubbles are less but still there. Front reservoir bench bleed went fine. Then I bled the brakes again, which was OK overall but the rear right seemed to also get bubbles more than the rest. Still soft brakes with 0 braking power. Also to note, I may have a vacuum leak because whenever I press the brakes it revs the engine slightly, but I couldn't find the leak with a smoke test.
My next step is just keep on bleeding the brakes, but anyone have any other thoughts on it? Could I have destroyed something in the booster when it popped? Or maybe one of the seals in the brake master cylinder?