Brake Pedal Goes to Floor After Brake Job... Bad Master Cylinder???

[X5 Meister]

I disagree. Pushing back the calipers is fine, but you MUST open up the brake fluid reservoir to allow for the fluid to move, and it will. Doing it that way will not introduce air into the system. You don't want to open a bleed valve because that will introduce air into the system. You won't get dirt into the ABS because it is closed and open only when ABS gets activated or the dealer uses the diagnostic computer to open it up during a brake bleed. That's why you should have them bled properly at the BMW dealer.

[jon6fountain]

Alright, I'm pretty sure it is the master cylinder then. I assumed this to begin with, but needed an answer as to why it went out. I'll order a new one tonight and take it to a BMW dealer or BMW Indie shop to have it installed and properly bled. Once again, thanks guys for all the imput and suggestions

[amacman]

meister, it`s not at all fine to push fluid back through x5 system

END OF.

[X5 Meister]

Been doing brakes for over 30 years and never heard of anything that you wrote so I'll have to completely disagree.

Originally Posted by amacman

meister, it`s not at all fine to push fluid back through x5 system

END OF.

[amacman]

well ,i read it somewhere official , can`t recall where but it makes perfect sense .
try it sometime and see what crud comes out of caliper, rusty cooked brake fluid

[X5 Meister]

That's why you do a flush.

[amacman]

each to thier own then
always do a flush
i`m off to my kip soon

[jon6fountain]

Alright, one last question. How much should I expect to pay for a brake flush/bled and to install the brake master cylinder? Just want to get an idea so I'm not getting ripped off.

[SuaveX5]

You should bleed the system before you order anything.!!!!!!!!

[BlackE32_SilverE53]

Originally Posted by SuaveX5

You should bleed the system before you order anything.!!!!!!!!

I agree