Today I replaced the MC on my 92 accord EX. I followed the DYI instructions. The replacement when pretty easily. I bled the brakes in 2 different sequences and I get the same results. I have no leaks anywhere.

This is my problem. When the car is off after bleeding the brakes the brake pedal is tight, the way it should be. When I start the car, the brakes work but the brake pedal is quite soft. Also, when I am in Park with the engine running it almost seems that the car is going to stall out.

Any suggestions on what I should do next?

Thanks

 

double check that your brake fluid is full and that the bleeder screws are closed. Also, you can follow the link below and download the service manual for additional information/specifics on your brake system

http://hondatech.info/downloads/Auto/Manuals/Accord/

 

sounds like its fine to me. When the engine is running the brake booster "kicks in" and theres waaay more pressure on the brakes.

 

You are bleeding the brakes with the engine running, correct? It almost sounds like you are trying to bleed them with the car turned off... You should always start at the wheel farthest away from the master cylinder (right rear) and work your way up to the wheel closest to the master cylinder (left front). You should be bleeding in this order: right rear, left rear, right front, left front, with the car idleing in park.

Should have bench bled the master cylinder prior to installation. Then you likely wouldn't have even had to bleed the brakes.

 

It feels like bleeding the brakes with the car running and in park did it. Thank you.


I feel that their is something else wrong. When I put my foot on the brake the idle goes down. In some cases it feels like it is going to stall.

 

When you changed the MC, did you carefully compare the length of the piston rod old-to-new? If they're not exactly the same, you have to adjust the push-rod at the brake pedal. There's a special tool for this.

If it's off, your brake booster can become a vacuum leak.

ps...
I always bleed brakes with the engine turned off. That's not it. Perhaps you didn't bench-bleed the new MC;then it just takes FOREVER to work all the bubbles out from the MC itself. It can improve byoperating the brakes for a bit & thenbleeding again.