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Papa is right. Valve on the later cars is still on the intake manifold coming from cylinder 4. Follow the brake booster hose from the booster to the engine and you will find the valve. Probably not the problem. The elbow on the booster will also twist and come off the booster. That might allow you to inspect the inside of the booster to see if the master cylinder is dumping brake fluid into the booster. If so....brake fluid will ruin the inner seals of the booster resulting in failure of the booster. Also check your booster hose. Do you hear a hissing that sounds like a cho cho train when you depress brake? Try to locate any sounds to determine location of your trouble.
Best Regards,
John M
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1978 AR Spider Veloce 2000....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
1978 AR Spider Veloce 2000...its slow black & rusty but complete and original!
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