Brakes Sinking to the Floor? Diagnose and Repair with Confidence

We'll learn why we might have a mushy brake pedal when the motor is running and how to fix it so we can have full power brakes in this post. Check the master cylinder fluid level. If not, your master cylinder went south. If there was, pull ALL of your wheels and check wheel cylinders. I have manually bled the brakes and have good fluid coming out at all 4 corners with no air or bubbles but the brake pedal is going to the floor with little ... Welcome to the SS Forums @Castros408 !! Brakes that go to the floor, on the first stroke, with no resistance will have me looking at everything ... The truck wouldn't stop unless you put your foot to the floor. After bleeding all the wheels again, same problem. I found out there is a "fifth" bleeder ... A sinking brake pedal slowly drops to the floor as you exert the same pressure. You'll be able to feel the pedal sinking when you're stopped at a stoplight or ... You either have a leak (which wouldn't result in a full reservoir), air in the lines, or more than likely a bad Master cylinder. I'd put my ... Typically, the three most common problems related to brake pedal sink are caused by the master cylinder, a brake fluid leak, or ABS unit leak. The Master ... The brake pedal still slowly goes to the floor. It is drivable and stops great, but at a stop light I need to let up and step on the brake pedal a couple of ... The loss of brake fluid leads to a loss of hydraulic pressure, so the brake pedal will feel soft or low and go to the floor. Leaking disc brake caliper(s). Like ...