well it does depend on the fact of if you replaced the brakes or not because after you replace your brakes you have to bleed them again or else they won't work properly if im correct
Step on the brake pedal.
If you mean loose as in the brake pedal is low, front of car nosediving when you apply brakes,your rear brake shoes are 1-out of adjustment,2 wore out and need replacing.You can diagnose this by raising parking brake lever,and hitting the brake pedal. If pedal is higher then the diagnosis is proven,if not,you have hydraulic problem-ie.fluid leak,front caliper guide pins stuck,master cylinder bypassing,needing replaced.
Try bleeding your brakes. If there is air in the system it can give a spongy feeling to your brake pedal and require you to pump your brakes and/or put your brake pedal to the floor.
Check the switch at the brake pedal, it is what makes the brakes come on, it may be malfunctioning.
Check the switch at the brake pedal .
Check the caliper slides (may be frozen) should slide freely to compensate for brake pad wear
You need to bleed the brakes.
Air in the system. Bleed the brake system.
try spitting on the front rotors. This helped and my brakes are like new
The brake pedal has nothing to do with it. If air is in the system then bleed the brakes.
It is the distance between floorboard and pedal top, when the brake pedal is fully depressed (after applying brakes).
The best way to tell when you need brakes is by squeaking, when the brakes are rubbing against the metal, when your brake pedal goes all the way to the floor and when you are running out of break fluid.