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The three full applications is standard so far as I can tell.
It seems to be the limit of the vacuum reserve tank on the vacuum booster.
By the way this is an easy way to tell if your vacuum boosted brakes are working without going on the road.
Turn the car engine off.
Press the brake pedal repeatedly (normally about three pumps) until it feels hard. Then start the engine with your foot hard on the brake.
If all is well the pedal should move toward the floor as the engine starts.
Cheers , Pete.
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