2004 Tahoe brake pedal to floor

[cbr629]

Came to a light brake pedal to the flloor. Got the truck home and no brakes into my driveway had to use emergency brake. When I start the truck with the pedal to the floor I get a push back but then it goes back to the floor. Never had an issue with the brakes for 54k miles,no leaks anywhere....what gives?

 

[Cubano03Tahoe]

Have u checked the reservoir? If its missing fluid u have a leak somewhere . If its full of fluid u got air bleeding into the system .

 

[cbr629]

Yes and I found the problem....rusted out brake line right below the drivers door