Soft Brake Pedal....

[ajwong]

Hey All,
I upgraded to e34 rears w/ an e32 master cylinder a few years ago which left me the firmest brake pedal I've ever had. Loved it. Over time its softened up a lot and I'm convinced it just hasn't been the same since I boiled my fluid one day at the track. Since that day I've done multiple bleads, replaced all the pads, and even had one of the front calipers rebuilt after finding a stuck piston from a melted rubber seal, but the pedal is still soft, perhaps even growing softer. The brake fluid tank stays full and I don't see any leaks anywhere....

Any ideas? Do I need a new master?

TIA,

Andy<img src="http://home.comcast.net/~wong.andrew/pics/sig.JPG">

[Philo]

The bleeding process needs to be performed with a pressure bleeder in order to overcome the ABS system. You probably still have air in the lines..., hydraulic fluid does not compress so when the air is out you will have a hard pedal again. Make sure you pump the pedal aprox 12 times for rears. I also heard something about having the ignition key turned on when bleeding an ABS system but not sure.

Philo.
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[88m53453]

Are you using DOT 4 fluid or ?

[ajwong]

<img src="http://home.comcast.net/~wong.andrew/pics/sig.JPG">

[ajwong]

So, you think it might be the abs system that needs bleeding? I think that requires some sort of electrical action while bleeding to get the abs to kick in... right?<img src="http://home.comcast.net/~wong.andrew/pics/sig.JPG">

[Randomg]

I remember one process is bleeding, going out, stomping on the brakes to kick in abs, and then rebleed, and repeat until the air is gone... My pedal has also been soft since boiling the fluid on a track, even after having a shop with a pressure bleeder bleed the lines.