You have a fluid leak somewhere. Look on the inside of each tire for signs of brake fluid. If not there it must be the master cylinder, but there has to be a leak somewhere.
Your brake pedal feels soft, one reason for this could be
Your brake pedal feels soft, one reason for this could be
Brake pedal will be soft if the front pads are seized in the slides..and/or your rear brakes are dirty and out of adjustment. Pull up the park brake slowly and count the clicks it goes up More than 5 clicks...needs rear brake adjustment
air in the hydraulic brake system
Soft pedal is caused by air in the system. Bleed the brakes starting at RR, then LR, RF, and ending at LF.
Probably a bad master cylinder...
if brake pedal is soft , either there is air in the system ,a brake fluid leak, or brake linings and pads are worn allowing the pedal to travel to far if there is a fluid leak, this can usually be found by getting under vehicle and looking at inside of wheels for brake fluid
test the booster with engine turned off, pump brake pedal until pedal goes hard then hold foot on brake pedal and start engine. if booster is working, the pedal will go soft as it should for mormal use. if booster is not working ,the pedal will stay hard
out of brake fluid?
Brake system has air in it.
brek pads
you still have air in your lines