Doing my annual brake service today, never had any issues before until today.
I take the outside pad out then restrain one piston with a clamp and pump the other one out with about four full pedal strokes bringing the piston about half way out. I then slowly push the piston fully back with a lever. I then repeat this for the other piston then replace the pad. I then repeat this process on the inside pad therefore ensuring all four pistons are free. Then usually I pump the pedal a couple of times to bring the pads into contact with the disc then repeat on the other side. The problem today is that I now have a very long travel in the pedal and can build it up to about half way with a few quick pumps. Having not disconnected any hydraulics I can't have introduced air into the system, so is this a master cylinder issue ?. It's a RHD car. With the pedal pumped up all four wheels are locked. Can a seal in the master have flipped because of the longer pedal stroke while pumping the pistons out ?. This is a procedure I perform every year but this is the first time I've had this problem.
I take the outside pad out then restrain one piston with a clamp and pump the other one out with about four full pedal strokes bringing the piston about half way out. I then slowly push the piston fully back with a lever. I then repeat this for the other piston then replace the pad. I then repeat this process on the inside pad therefore ensuring all four pistons are free. Then usually I pump the pedal a couple of times to bring the pads into contact with the disc then repeat on the other side. The problem today is that I now have a very long travel in the pedal and can build it up to about half way with a few quick pumps. Having not disconnected any hydraulics I can't have introduced air into the system, so is this a master cylinder issue ?. It's a RHD car. With the pedal pumped up all four wheels are locked. Can a seal in the master have flipped because of the longer pedal stroke while pumping the pistons out ?. This is a procedure I perform every year but this is the first time I've had this problem.