Bleeding ABS after Master Cylinder change - JeepForum.com
 
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post #1 of 4 Old 06-23-2021, 11:50 AM Thread Starter
Dakk
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1993 ZJ 
 
Join Date: Jun 2019
Posts: 11
Bleeding ABS after Master Cylinder change

So I started to change the Master Cylinder last week. RockAuto sent the wrong part so the 93' ZJ 4.0 sat with the lines from the Master Cylinder and proportioning valve disconnected for about a week (hindsight says this was a bad move). After the new Master cylinder was bench bled and installed, I realize a bit of air probably got into the ABS. I wasn't initially concerned with air getting in the lines and such because I was going to do a flush, but I'm unfamiliar with the ABS.

I haven't bled or drove it yet, gonna do a standard bleed and see where that gets me. Any ideas what I can do with this ABS?

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post #2 of 4 Old 06-23-2021, 01:13 PM
Mr. Puddles
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1996 ZJ 
 
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Garage
Dealer for sure. Or you can call your local service facility (Firestone, Goodyear, NTB, ect.) and ask them to verify if their scan tool will actuate the ABS unit.

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post #3 of 4 Old 06-24-2021, 06:02 AM
jeepjeepster
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Most shops most likely wont be able to hook up to a 93. Before I had a MT2500 to bleed the brakes, I would raise up my Jeep and with it running in gear, apply the brakes. The ABS would go crazy. Had my vacuum bleeder hooked up while doing this.

1994 ZJ-I6 w/270,000 mi
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post #4 of 4 Old 06-24-2021, 09:21 AM
wingless
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Welcome to the forum.

This reply shows usage of my DRB II tool to bleed the ABS module.

My suspicion is that a normal bleed is required when servicing the brake hydraulic components, not also requiring the ABS bleed using the DRB II tool, unless somehow the ABS was activated to contaminate internal fluid during the service. I am unaware of how that contamination / activation could happen.


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