Air in the system. Bleed the brake system.
check fuses & brake lights switch located on brake pedal
a low brake pedal indicates worn brake pads and shoes.have then replaced
It sounds like you need to bleed the system of air.
brake pedal light switch.
No it will not, The front brake rotors are out of round. Needs replaced are turned, both rotors.
A bad brake rotor in the front or rear can cause a pulsation in the brake pedal when pressure is applied on the brake pedal when the vehicle is in motion. The brake rotor can be measured with a micrometer to be sure it is within specs and has enough material to be legally resurfaced on a brake lathe. In most cases now rotors are simply replaced with new ones to be cost effective.
when your brake pedal moves up and down when you press the pedal ,usually it is a warped brake rotor or a loose bearing on one or both brake rotors Warped front disk brake rotors.
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.
Did you bench bleed the master cylinder? Check the front flexible brake lines - they may be internally rutured and are blowing up (like a balloon) when you step on the brake
All brake light sensors are switches connected to the brake pedal. its a switch that is mounted on the front of the pedal on the top.
Step on the brake pedal.
In front of the brake pedal.