Just checking to see if anyone else has had a problem with a 2000 GP brakes feeling spongey. I took it to the dealer this morning and they said there was nothing wrong. I insisted they take another look. I should not be able to push the pedal to the floor during hard braking. I just completed a brake job (new pads, rotors, complete system gravity bleed.). I may have gotten air in the system but bleeding it should have gotton rid of it. Has anyone had problems with the master cylinder failing on a 2000 GP?

Check two things, the vacuum booster to make sure it isn't losing vacuum during braking and two rebleed the brakes again. Spongy brakes are usually caused by air in the system and now that you have run it for a while any remaining air should bleed out easily. One question, the master cylinder didn't go dry when you were bleeding the system did it? If so you will have to bleed the master cylinder and start over!!!

when you changed the pads, did you open the bleeders when you pushed the caliper pistons back in? If you pushed the dirty fluid back up the system, that is what is causing your spongy pedal. There are many small passages in the ABS motors, and they will get clogged with debris. Also, moisture is much more prevalent in the fluid in the caliper pistons, and moisture expands as it heats, causing a spongy pedal. The best way to push the caliper pistons back in is to open the bleeder, forcing the old dirty fluid out, then top off the master cylinder with fresh fluid.