Booster has to do with the pedal force, and should not affect pedal travel.
Are you use stock calipers, or a caliper from a different car or aftermarket?
Are you using the right model of master cylinder?
My thought on these two questions is everything could be working properly, but your calipers/master cylinder are not matched. Some brake master cylinders put out more volume than others.
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Other thought: you push the brake pedal once and there is a lot of travel. What happens when you immediately release and push a second time? Is it then rock hard or feel spongy?
Does this happen when the car is moving, particularly right after taking a hard turn, or does it act this way when the car is stationary. If it happens only when it's moving, the pads could be getting pushed back by the rotor, which is not uncommon in some cars on the track.
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Jim
1986 Porsche 944 Turbo
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