Bleeding problems

[Brallon]

Please tell me what I am doing wrong. I have bled all four brakes 3 times now. Feels good and hard everytime, but the second I start the engine, the pedal starts going to the bottom when I press the brakes.
What to do?

 

[Old.Tony]

If you pump the brakes a few times (have someone do this for you, perhaps), is there any sign of hydraulic fluid coming from the calipers or the drum housings? If there's no sign of a leak there, check the ABS unit. If there's no leak there, it might be the booster. It should have a vac line running to it. Disconnect this, try again - result?

 

[Brallon]

No leaks anywhere that I would have noticed.
Just to make it easier for me, could you tell me the location of the booster you mentioned?

Also, could it be an idea trying to bleed it while the engine is running?

 

[Old.Tony]

The brake booster is the large round thing closer to the firewall attached to the brake fluid reservoir you've been filling up.

 

[Brallon]

Ah yes of course. I will check that this weekend.
Didnt know what you meant becauae of my own bad english