95 Accord EXL 4dr 4cyl 185K

Recently, I replaced my rear brake pads (worn out) and bled me entire brake system. I used Honda OE Dot 3 brake fluid and bled all four corners until new, clear fluid was coming through.

After the bleeding, my pedal never felt firm and actually gradually goes to the floor once the car (fluid) gets hot. If I don't continue to press the brake pedal as is goes in, my car will move forward. Sometimes it seems to bottom out.

Surely, the master cylinder or brake booster just didn't up and go bad out of the blue? It seems a little coinsidental after the brake bleed.

Any ideas?

Thanks.

 

master cylinder show any signs of leaking?

id say try to bleed it again.

 

nope... master cylinder appears dry as a bone. no leaks from anywhere that I can find or see.

I figured I'd jack it up again and re-bleed....

 

If that doesn't work get a new master cylinder. That can leak internally, back into the reservoir. If you don't bleed/flush the fluid regularly, there's crud in there. When you bleed the MC piston gets stroked all the way down where it never normally goes. Abrasive junk cuts up the edge of the piston seals.

Sometimes you can avoid this by using a pressure bleeder or just NOT pumping the pedal all the way down. (Put a piece of 2x4 under the pedal while bleeding.) Sometimes it just happens anyway.

 

Couldn't have said it any better myself.