i feel like i have lost power to my front brakes and am not sure if the are releasing all the way. i feel all the breaking coming from the back end. i have bled all four corners and still have no pressure. the peddle goes all the way to the floor. i am suspecting that it could be the proportioning valve but i am not positive. is there any way to know for sure if it is my PV or could it be my master cylinder?
My car has 160000 miles.
My car has an automatic transmission.
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