Brakes work fine if pedal pressed slowly, dont work if pressed suddenly
I just replaced my front stock brakes on my 1973 with a Wilwood kit with 6 piston calipers. The brakes were bled and the pedal is hard and feels normal. If I press the brakes slowly, they work fine. However, if I suddenly press the brake, the brakes dont work at all even though the pedal stays hard. I cant figure out why. Is there some sort of bypass in the master cylinder when too much pressure is applied? More detail;
Before; stock front discs + drum rears with Classic Performance Products aluminum master cylinder with the built in proportioning valve -- worked great
After; added a Wilwood Dynapro front big brake kit with 6 piston calipers and 12.2" rotors. I also replaced the brake booster with a new unit.
Again, I am trying to figure out why the new set up works fine when I press the brake pedal slowly, but absolutely do not work at all when I jump on the brakes and press the pedal suddenly and strongly.
thanks,
mike
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1973 RS Z28, 401ci Dart Little M with AFR 227 comp porting heads, Callies Magnum crank, Lunati Pro Mod Rods, JE blower pistons @ 7.8:1, Littlefield 6-71 with 14 lbs boost, Reed solid FT cam with 240/250 duration @ .050", .523/.542" lift and a 112 LSA, T&D 1.6 shaft rockers, Lemons 1.875-2.0" step headers
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