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  #1  
Old 06-01-2015, 05:30 PM
CBoggs CBoggs is offline
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Default ABS Brake Modulator Valve

Greetings All.
First a little background. Have a 94 Ranger. Rear brakes stopped working. Replaced the shoes, wheel cylinders, rear lines, rear brake block. Made sure the main line to the rear was clear, it was. Finally chased the stoppage to the ABS Brake Modulator valve. Master cylinder is supplying brake fluid / pressure to the front of the modulator valve, but nothing comes out the rear of valve. No lights on dash. Replaced valve with one from the junk yard still nothing.

Located a replacement on RockAuto, probably rebuilt, but also found an ABS Modulator Controller.

Question(s) is:
1. Has anyone experienced this ABS Modulator Valve issue, and did the replacement with a rebuild modulator correct the problem?
2. With no dash light could it be the ABS Controller?
3. Found a thread stating I could bypass the Modulator with a piece of line, but won't that cause the rear brakes to lockup during a hard stop?

Thanks for the help.
Chris
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1994 Ranger,
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160,000 miles
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  #2  
Old 06-01-2015, 05:51 PM
cvar cvar is offline
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Join Date: Jun 2012
Posts: 1,310
Default Re: ABS Brake Modulator Valve

Welcome to FRF. Your first post and already you have a signature line. Well done!

I presume you're referring to the RABS? Or do you have full ABS (fronts too)? The RABS is this: http://i.imgur.com/vP3j8.jpg

If you get pressure at RABS input, but none on RABS output, then a new/rebuilt one should fix it. Mine still works. I wouldn't bypass it if it failed.

See RABS info at http://www.aa1car.com/library/abs_kelseyhayes_rwal.htm
The main culprit seems to be RABS internal rusting due to brake fluid absorbing water over time and doing infrequent brake fluid changes.
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  #3  
Old 06-02-2015, 08:50 PM
CBoggs CBoggs is offline
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Default Re: ABS Brake Modulator Valve

Yes Sir, the RABS. Thanks so much for the reply. Thats the next step, a rebuilt RABS.

Thanks again!
Chris


Quote:
Originally Posted by cvar View Post
Welcome to FRF. Your first post and already you have a signature line. Well done!

I presume you're referring to the RABS? Or do you have full ABS (fronts too)? The RABS is this: http://i.imgur.com/vP3j8.jpg

If you get pressure at RABS input, but none on RABS output, then a new/rebuilt one should fix it. Mine still works. I wouldn't bypass it if it failed.

See RABS info at http://www.aa1car.com/library/abs_kelseyhayes_rwal.htm
The main culprit seems to be RABS internal rusting due to brake fluid absorbing water over time and doing infrequent brake fluid changes.
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1994 Ranger,
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160,000 miles
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