How to bleed the brakes with rear ABS?

GOGOJUICE6

MEMBER
1994 FORD RANGER
2.3L
4 CYL
2WD
MANUAL
113,000 MILES

I replaced the master cylinder in my truck. According to Haynes, after bleeding master cylinder, I have to bleed the ABS unit. There's no bleeder screw in it, just an 7/8 nut, (which I don't want to mess with it, not knowing what is it for) and then, continue with the standard bleeding pattern. How do you bleed a screwless ABS unit, if so?
Thanks for your help, and
Happy Holidays to y'all.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,323 POSTS

Happy Holidays to you as well. Can I ask if you have a good brake pedal, and the system seems to work okay? If so then you don't need to bleed the ABS system. The only way to bleed the ABS is with a scanner to open the valve inside the control valve. Please go over this video to show you what I am talking about:

https://www.youtube.com/watch?v=nQRnKyVyMuQ&t

Please let us know what happens.

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Sunday, December 1st, 2024 AT 12:43 PM

GOGOJUICE6

MEMBER
75 POSTS

Brakes were fine until the right rear wheel started locking up. Thinking it was air in the line, bled it. Nasty dark fluid and air was coming out until it stopped. Maybe clogged line. Took it off and it is clogged. Ordered both sides, should be here by Thursday (hopefully). I'm not sure if my obd 1(it's a '94) can pick up brake issues. I was told I could bypass ABS, is this true? If so, how do I go about it?
Thanks for your help and knowledge, Ken.

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Monday, December 2nd, 2024 AT 9:06 AM

KEN L

MASTER CERTIFIED MECHANIC
48,323 POSTS

The ABS system will not make the tire lock up; I would not worry about the ABS system if you have good brake pedal. Here is a guide on what makes the brakes lock up, please go over it to help fix the problem:

https://www.2carpros.com/articles/a-comprehensive-guide-to-fixing-automotive-brakes-locking-up

Please go over this guide and get back to us.

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Monday, December 2nd, 2024 AT 10:12 AM

GOGOJUICE6

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75 POSTS

Great, I'll replace lines, check the wheel cylinder and check for grease leaks. Bleed and see how it goes. Will let you know in a few days.
Outstanding article.
Thank you so much for your help.

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Monday, December 2nd, 2024 AT 11:37 AM

KEN L