Disc Brake Master Swap & P valve Question

i just put bbp disc brakes on my car (68 dart)

my car is originally manual brakes, is still manual brakes.

I did not add a proprotioning valve and my car stops just fine, i have awesome pedal response.

dunno if any of that helps.

my sister in laws 70 dart swinger is set up the same way, someone else upgraded and did not add the p-valve, so I did not. since it has no braking issues