Check the ABS control valve located on the inside of frame rail, drivers side. They can bleed off internally just like a master cylinder can.
any external leaks, how are the drums? most likely look for external leaks in rear drums. if no leaks it has internal leak in master cylinder. replace the master.
He is right just wanted to let you know that the control valve is refered to the RABS valve if you go into the local dealership. They should know what you mean. And yes it sucks no easy way to test the valve. I have seen and replaced many in my day and they are known to fail. Start there first. Then proceed above.
Powerstroke 57
Check your brake fluid. Next maybe your brake lines need to be bled. OR you just might need new brakes.
First, make sure the master cylinder is filled with brake fluid. If it is low, there may be a leak somewhere in the brake lines or a brake cylinder. If the master cylinder is bad, you can normally pump the brakes up, but the pedal will slowly sink to the floor again. The master cylinder needs to be replaced or repaired.
you either need a new brake master cylinder or your brakes need to be bled
Have your brake system checked immediately! (by a proffesional)
Try bleeding your brakes. If there is air in the system it can give a spongy feeling to your brake pedal and require you to pump your brakes and/or put your brake pedal to the floor.
You need to bleed the brakes.
Master cylinder may be leaking, brake pedal may slowly fall to the floor when you are stopped with your foot on the brake.
If sitting still in your car with the engine running you can apply the brakes and the pedal slowly goes towards the floor you have a defective brake master cylinder. The only repair is to replace the master cylinder. This is a very dangerous situation and must be repaired immediately. Failure to replace the master cylinder may result in an accident.
usually they will leak out the back by the booster, your brake pedal will slowly go to the floor at stops or the brake pedal will go right to the floor when pushed.
i do not no
Air in the brake system- Brake system needs to be bleed and fluid needs to be added while you are doing that.
If you are losing fluid and the pedal is low, you have a brake fluid leak.