The leak may coming from a brake line or one of the brake calipers on your vehicle.
Chevy truck brake pedal goes to the floor.
When bleeding rear wheels the pedal will go to the floor when the bleeder is open.
Axle bearings hold the brake rotor true without play while they both rotate.
1 leak from brake line or brake caliper.
Abs works thats for sure.
Reasons your brake pedal goes to the floor.
Check the backside of each tire.
Technically there are two main causes that would make the brake pedal sink all the way to the floor.
The final reason for a brake pedal to go to the floor is failing axle bearing.
I can still stop.
Just disconnect the lines connect up bleeding fittings and hose and pump away.
But i m getting a pedal that when pumped will stop but otherwise is dropping to the floor board.
One of the reasons is the brake system loses pressure from an external brake fluid leak.
I took the truck on a 30 minute drive the other day and on the way back home my brake light came on and the pedal goes almost to the floor.
If this bearing goes bad it will allow the brake rotor it move back and fourth which pushes the caliper piston back into the caliper creating an air gap.
I have a 95 k1500 chevy stepside 350 truck with automatic trans.
The fronts allow pedal travel to about 3 4 of the way to the floor and push fluid but then the pedal stops hard wont go to the floor and the fluid trickles out.
Finally there is a little switch under your dash that is held down turning the brake lights off when the brake is up.
I then start the truck and the pedal goes to the floor.
Well today is the first snow we ve had first ive driven it in the snow.
The back brakes are low but in good condition not like the fronts at all.
But if there is no leaking fluid then that s not your issue.
I looked all around the truck for leaks from brake fluid there is none and the brake resiviour sorry for the spelling is still full.
I pump it several times with the engine running and it makes no difference in feeling.
I would bleed the master cylinder which can be done in the truck.
Up until today the brake pedal was firm when pressed to stop.
My 04 hd had the pedal go to the floor but it was because the every hard line ruptured.
If the reservoir is empty or the brake fluid level is low there is most likely a leak somewhere in the brake system.