Willwood drag race front brakes

[tuffxf]

G,day,
Recently put a willwood drag race front brake kit on my falcon, 4 spot calipers using my original master cyl and booster.
Replaced the std single pot floating caliper, as they are very heavy and always drag slightly.
With the std brakes can consistanly cut .020 - .040 lights off the footbrake, new brakes consistant .070 - .090.
Got similar results a few years ago when i put an electric brake vacuum pump on the car, brakes worked great but the more pedal pressure took longer to release,
I think i'm seeing exactly the same thing here.
I leave on the first flash of the third light, don't want to deep stage or guess between the lights.
What options do i have?
Thanks very much!
Cheers
Paul

[Dave1695]

The first thing I would check for is brake drag with no pedal pressure applied. You may just need to shim the calipers slightly, to get it centered on the rotors. If they are off center, the pistons on one side may not be able to retract enough. There is less than a thirty second of an inch movement of the piston, when the pressure is relieved, so you can see how critical having the calipers properly located is. You can also check line pressure at each front bleeder screw, with booster assist and a firm push on the pedal, you should see about 900 to 1000 PSI on the gauge. You as driver should push the pedal and have a friend read the gauge.

[tuffxf]

G,day,
Thanks for the reply! brake drag is fine, I spent a fair bit of time shimming the calipers to get them centre.
I've ordered a brake pressure gauge to screw into the calipers and see whats going on.
Is it possible to have too much pressure at the calipers?
Cheers
Paul

[Dave1695]

With a one inch bore master cylinder, and about 5 to 1 pedal ration, you will max out at about 1000 PSI at the caliper. You may want to consider installing a brake pressure gauge inside the car and use it to stage the car. That way you will apply consistent pressure to the brakes every time.