Sorry for the double post, think I posted this in the wrong forum.

I did a brake job a few weeks ago where I installed new rotors and pads myself on the front brakes only. When I was done I noticed the brake pedal had to be depressed about 2" before any braking would be applied, so I took it to the dealer to get the brake fluid changed and bleed out any air that might have been in there. When that was done, the brakes felt perfect - very firm and touchy like they always have been. About a week later and they are right back to where they were, very spongy and I can get the pedal down to the floor just about when the car is running, but not when its off. I'm not losing any brake fluid, the level has stayed steady in the reservoir since having it replaced at the dealer. Is there anything else I should check or replace to fix this?

Its an '06 Honda Accord EX v-6 with about 92K on it.

 

you got a master cylinder issue. fluid is getting by the piston.

 

Thanks guys - I'm planning on replacing the master cylinder.

Is there any reason to go with a genuine Honda master cylinder and brake fluid? A friend of mine thought the aftermarket ones were crap but I havent seen any other negative reviews.

Also do I need to do anything special regarding the ABS when I bleed the brakes after replacing the MC?

 

If the brake fluid isn't changed often enough, the moisture it absorbs causes rust inside the master cylinder. Then, when someone pushes the brake pedal to the floor, while bleeding the brakes, all that rust on the shaft is pushed through the seals and tears them up. That's why a master cylinder will often go out right after bleeding. I would use a Honda master cylinder, and fluid, but I'm **** that way.