Brake Pedal Goes to Floor After Replacing Master Cylinder? Understand the Causes

The brake pedal goes to the floor with very little resistance. It isn't spongy like there is air in the lines. It just goes to the floor if you push it all the ... Pedal goes to the floor then has like an inch of actual brakes. Don't see any line leaks, bled them, replaced a wheel cylinder made sure the drums were tight. Release it and/or pump it and it comes back to normal. It's usually the result of the piston seal failing, catch it just right and the seal ... Sounds like multiple problems going on the way you describe it. Replacing the pads (if that's all he did/ rotors too) really shouldn't have ... Most likely the Master Cylinder piston seals are leaking internally which is why the fluid level stays the same. You could either rebuild the ... 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 ... While you have the booster off and the vac line is disconnected turn it upside down to make sure fluid has not accumulated in it. When you go back together with ... Wagner Brakes recommends the following procedure to find out if the problem is a bad master cylinder or a leaky EH valve in the RWAL system. I have to press the brake pedal all the way to the floor to get it to stop. Even then it sounds bad. If i pump it then it kinda slows down but not that much. ... Is your brake pedal sinking all the way to the floor when you press it? Does it feel softer than normal, or spongy?