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So when I start the 69 Camaro, the brakes work fine. I can jam them and the wheels will lock up and stop. Then when the engine warms up, pedal goes almost to the floor, are mushy and do not stop very well. I'll put it this way, if I have to stop suddenly I cannot. These are power brakes from a conversion done many years ago. I cannot even remember if they ever worked correctly. This is what we've done:

1. replaced master cylinder
2. adjusted push rod
3. bled brakes
4. verified the brake lines are not close to exhaust

I have no idea what to try next. I am thinking I should disconnect the booster and eliminate that.

Any ideas??
 

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Engine vacuum is a must. Higher RPM's, more vacuum if bigger than stock camshaft.
A minimum of 15 inches of vacuum, I believe is required for correct action, others here running bigger camshafts may comment.
If vacuum is low, generally a vacuum pump and reservoir with check valve against engine supply is installed for more vacuum to get brakes in functioning correctly.
 
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