Bad master cylinder?

[bigjae46]

Will do. Starting to understand where “break my wallet” comes from...

Will do. Starting to understand where “break my wallet” comes from...

You’ll need 2 fittings to screw into the brake line ports to bench bleed the master cylinder. Not sure if a regular brake caliper bleeder screw will work. Put the master cylinder in a vise and then run hose from the ports back to the reservoir. And then fill and them pump the piston with your hand.

Install the master cylinder. Bleed in the system, actuate the ABS pump and bleed some more.

I used Walmart DOT 4 and once everything was good bled Motul into the system, actuated the ABS pump, bled some more.


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[SteelGreyM]

You’ll need 2 fittings to screw into the brake line ports to bench bleed the master cylinder. Not sure if a regular brake caliper bleeder screw will work. Put the master cylinder in a vise and then run hose from the ports back to the reservoir. And then fill and them pump the piston with your hand.

Install the master cylinder. Bleed in the system, actuate the ABS pump and bleed some more.

I used Walmart DOT 4 and once everything was good bled Motul into the system, actuated the ABS pump, bled some more.


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Dude is this your car??

[bigjae46]

Dude is this your car??

It is


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[SteelGreyM]

It is


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No way!! A buddy of mine in Texas knows I have an e46 and sent me this photo the other day. I knew it had to be a forum member! Small world!

[eacmen]

You’ll need 2 fittings to screw into the brake line ports to bench bleed the master cylinder. Not sure if a regular brake caliper bleeder screw will work. Put the master cylinder in a vise and then run hose from the ports back to the reservoir. And then fill and them pump the piston with your hand.

Install the master cylinder. Bleed in the system, actuate the ABS pump and bleed some more.

I used Walmart DOT 4 and once everything was good bled Motul into the system, actuated the ABS pump, bled some more.


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Did you use a pressure blender or two person?

How much total fluid did you need to push through the system before it was bled?

Crack the bleeders while actuating the ABS pump?

[bigjae46]

No way!! A buddy of mine in Texas knows I have an e46 and sent me this photo the other day. I knew it had to be a forum member! Small world!

I was wondering where you got that pic. Yea...small world! Lol


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[SteelGreyM]

Did you use a pressure blender or two person?

How much total fluid did you need to push through the system before it was bled?

Crack the bleeders while actuating the ABS pump?

How do you go about actuating the ABS pump? My INPA only activates a few features on the M3. On the non M it will activate everything and run vanos tests too...

May need to take it to a shop and have them hook up their computers to do a proper bleeding.

[JudahJD904]

My master brake cylinder was fine before sitting for 3 years. I came back, started it up, and the pedal went to the floor with no ABS and only the front rotors working with no warning lights except for DSC. I had a shop flush the brake fluid to make sure it wasn’t air or old brake fluid, but it ended up being a faulty master cylinder. Good luck with getting yours fixed.

[bigjae46]

Did you use a pressure blender or two person?

How much total fluid did you need to push through the system before it was bled?

Crack the bleeders while actuating the ABS pump?

I used a pressure bleeder. I think I used 2 qts. I think I spilled a good amount trying to bench bleed it...what a fiasco. Didn’t have the right fittings. Need the right fittings.

If you use a bleeder fitting, just leave it open and keep pumping the piston by hand until no more bubbles circulate. Don’t need to open and close.

Once I installed the MC it didn’t take long the bleed all of the air out. If you didn’t bench bleed then I’d imaging it would take a long time to get the air out. I spent more time bench bleeding than doing the rest of the install.


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[eacmen]

How do you go about actuating the ABS pump? My INPA only activates a few features on the M3. On the non M it will activate everything and run vanos tests too...

May need to take it to a shop and have them hook up their computers to do a proper bleeding.

I use the foxwell 510 scan tool that schwaben resells. You can do it with DIS as well though.

[bigjae46]

How do you go about actuating the ABS pump? My INPA only activates a few features on the M3. On the non M it will activate everything and run vanos tests too...

May need to take it to a shop and have them hook up their computers to do a proper bleeding.

I’m pretty sure I used INPA. IIRC, I had the ignition on and pushed the button.


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[heinzboehmer]

INPA can definitely do it. Just did it last week on my car.

Click the activate button in the dsc menu and there should be a button that says something about the abs pump (sorry about the vague description, but I'd need to hook up my computer to my car to tell you exactly what to click). It'll ask you to press the brake pedal at least 80% (I think) and it'll actuate the pump.

[SteelGreyM]

INPA can definitely do it. Just did it last week on my car.

Click the activate button in the dsc menu and there should be a button that says something about the abs pump (sorry about the vague description, but I'd need to hook up my computer to my car to tell you exactly what to click). It'll ask you to press the brake pedal at least 80% (I think) and it'll actuate the pump.

I’m not sure if my cable is bad or not but I can’t communicate with a bunch of modules...

[eacmen]

I’m not sure if my cable is bad or not but I can’t communicate with a bunch of modules...

Make sure pins seven and eight are shorted

[liam821]

Yeah, if you have air in the ABS system you need to use INPA to run through the brake bleed procedure.

Will do. Starting to understand where “break my wallet” comes from...

See you just need a whole other e46m3 as a parts car............