I just replaced all my calipers and pads, and now my brake pedal slowly goes down when I maintain pressure on it. I've tried bleeding the lines at the wheels several times, but still no luck.

Any suggestions?

thanks

 

Be sure you've got all the air out. The rear calipers have 2 bleeder valves on each caliper. If pedal is sinking, something is leaking, or air in system. Does the pedal sink with the engine off?

 

I haven't tried with the motor off. I'll investigate ASAP.

thanks.

 

I turned off the engine with the brake pedal pumped up and applied constant pressure. It didn't seem to go down. Then I turned on the motor, and the pedal slowly went down.

Vacuum booster problem?

 

Bleed it like the pros with the motive pump. (motiveproducts.com) It makes its really easy and if you use ATE super blue brake fluid you can actually see the new blue fluid before you close the valve. Worth the $$$ IMO.

 

Thanks for the tip; I agree, the right tool makes life very good. Short of Santa sending me some cash, I'm pretty broke at the moment so if I can do this with a brake line wrech, fluid, and some clear hose, that's my preference.

 

Ask to see if any local 7 owners will let you use it, many have the pump. I would let you use it if you were local

 

It might be a bad master cylinder. If it leaks internally, the pedal will drop under pressure.

-Max

 

when you are bleeding the brakes do you see a lot of air bubbles coming out? how much fluid did you bleed out of the system?