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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Jan-22-2018, 07:54:18 PM   #1
nholmes
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Question ABS Pump Bleeder Nipple?

So, I'm looking into trying to get all the air out of my brake system and I believe that I have air trapped in the ABS module.

Before anyone asks, I've already bled 1L of fluid through the system using the 2 person method including cycling the ABS intake/exhaust solenoids with the pump via INPA. My next step will probably be to use ISTA-D / Rheingold and try the ABS bleed sequence included with that dealership software.

While I'm waiting to get that set-up, I wanted to see if anyone on the forums has ever had any success attaching a line to the nipple on the pump and then bleeding from there with the pump actuating.

It's almost impossible to access this nipple with the M/C, reservoir and the fuse box in the way, but I'm sure someone has tried this at least once?

I'm talking about this:



Usually it has a rubber cap on it like a brake caliper bleeder:



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Old Thu, Jan-25-2018, 04:08:12 PM   #2
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Default Re: ABS Pump Bleeder Nipple?

You shouldn't have to touch that at all. I use a pressure bleeder that connects to the reservoir and pushes fluid through. I switch between super blue and clear ATE fluid so I can tell when it's completely flushed and have a solid pedal every time. I used to just gravity bleed brakes where I'd crack the bleeder and grab a cup of tea. Nowadays I'm too impatient and pressure bleeding takes a whole 10 minutes
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Old Thu, Jan-25-2018, 04:10:25 PM   #3
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Default Re: ABS Pump Bleeder Nipple?

Why did ATE put a bleeder there?
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Old Thu, Jan-25-2018, 04:58:54 PM   #4
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Default Re: ABS Pump Bleeder Nipple?

Could be where they filled the system from the factory.
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Old Mon, Feb-26-2018, 11:36:38 PM   #5
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Default Re: ABS Pump Bleeder Nipple?

So, to follow-up since most people don't bother on forums...

Well, after having changed a million things on the car to eliminate variables to deal with the low pedal engagement and squishy pedal I finally fixed it. BBK was not the answer but I can see why people would say that since it helps mask the poor braking with more braking force.

Yesterday I had a friend over to help me bleed the ABS. I read a lot of stuff online about how it's not needed and the system is self bleeding, etc etc but I wasn't convinced.

We performed one final bleed of the system to confirm there was no air trapped anywhere. We then removed the cap on ABS bleeder nipple shown:



We stuck an 11mm wrench onto the hex of the ABS bleeder nipple (it's super tight in there, get a wrench with a directional switch, for real) and then my caliper bleeding tube.

I hopped into the driver's seat and pumped the brake pedal to pressurize the line.

He then cracked the bleeder and a bubble about 1.5" in tube length escaped!



We did a couple more bleeds which got us a few more bubbles and continued until it was bubble free. Fluid came out new, so this wasn't a pocket of trapped fluid, it was just air that couldn't vent itself with normal ABS use.

So, if you're having a hard time getting your pedal back to normal after you've done the, "You need to use like 1L of fluid to get the brakes right, dude" and it still doesn't work or activating your ABS on street - I recommend you try this.

Have fun out there!
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Old Tue, Feb-27-2018, 05:19:38 PM   #6
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Default Re: ABS Pump Bleeder Nipple?

Interesting....will try this with my next bleed.
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Old Tue, Feb-27-2018, 05:27:27 PM   #7
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Default Re: ABS Pump Bleeder Nipple?

So you have a rock hard pedal and the car stops on a dime now. Do you give credit to the booster or the abs bleed? ABS bleed seems much easier and cheaper. I have never done one so I might give it a try.
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Old Tue, Feb-27-2018, 10:54:36 PM   #8
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Default Re: ABS Pump Bleeder Nipple?

With the DIS procedure, it actuates the ABS solenoids to bleed the unit.

Others use a bridge relay to activate the ABS pump.
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Old Wed, Feb-28-2018, 12:25:24 AM   #9
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Default Re: ABS Pump Bleeder Nipple?

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Originally Posted by M_Parallel View Post
With the DIS procedure, it actuates the ABS solenoids to bleed the unit.

Others use a bridge relay to activate the ABS pump.
I don't have DIS. I was able to actuate the solenoids and pump via INPA but that did not vent the air trapped at the bleeder nipple.

Bridge relay only activates the pump as I've used this method previously, it doesn't actuate the intake and exhaust solenoids.

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Originally Posted by pbonsalb View Post
So you have a rock hard pedal and the car stops on a dime now. Do you give credit to the booster or the abs bleed? ABS bleed seems much easier and cheaper. I have never done one so I might give it a try.
So the low engagement and soft torque was due to the brake booster. The first 20% of the pedal was due to air trapped in the ABS system inside the pump that was not able to vent during normal driving (including actuating the ABS on street/track).
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Old Wed, Feb-28-2018, 12:40:20 AM   #10
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Default Re: ABS Pump Bleeder Nipple?

Seems like that bleeder nipple is only on 96+ cars

Dammit
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Discussing ABS Pump Bleeder Nipple? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)