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ABS System

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Old Nov 22, 2006 | 02:37 PM
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ABS System

We recently purchased a 95 F-150. 4WD, with the 5.8 motor. What do I need to look at when the ABS light flashes on the dash? Where is the sensor for this located or where is the main ABS control located?

I posted about this yesterday, and there was a little extra complexity because the truck also had a trailer brake wired in, but I unpluggged that for now.

Basically the brake lights are not coming on when I depress the brake pedal, and the ABS light is constantly flashing on the dash panel.

Thanks for any assistance you can give me.
 
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Old Nov 22, 2006 | 10:30 PM
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Check your electrical connections under the dash at the brake pedal
 
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Old Nov 23, 2006 | 07:50 AM
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From: Easton,Ks
Originally Posted by lpaz1
We recently purchased a 95 F-150. 4WD, with the 5.8 motor. What do I need to look at when the ABS light flashes on the dash? .
Bad fuses.
Originally Posted by lpaz1
Where is the sensor for this located or where is the main ABS control located?
You have four sensors feeding the RABS Module, one is the Brake ON/OFF Switch (more than likely your problem), Brake Fluid Level Switch, Brake Pressure Switch and the other sensor is at the top center of the rear end (The VSS Sensor). It also has input from the RABS Valve assembly.

The RABS Module is behind the glove box.

Check all fuses first.
 

Last edited by subford; Nov 23, 2006 at 07:56 AM.
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Old Nov 23, 2006 | 12:56 PM
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The RABS module must have a signal from the brake lights. I agree that your problem is probably the brake light switch under the dash at the top of the brake pedal. Once you get the brake lights working disconnect the battery for about 30sec. to erase the error codes and try it then.
 
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Old Nov 24, 2006 | 08:11 AM
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The RABS module resets itself each time the ignition is turned off, so disconnecting the battery will not do anything but make you have to reset the radio presets.

Bill (subford), where is the pressure switch? Is it in the RABS modulator valve on the frame rail?
 
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Old Nov 24, 2006 | 11:57 AM
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From: Easton,Ks
Originally Posted by EPNCSU2006
Bill (subford), where is the pressure switch? Is it in the RABS modulator valve on the frame rail?
The pressure switch in the 1995 diagrams is on the end of the master cylinder. It is also used for dropping out the speed control.
 
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Old Nov 24, 2006 | 01:50 PM
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Oh ok, gotcha. I didn't even think of that. What did the older vehicles with the vacuum operated cruise control use for a brake pressure input, anything?
 
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Old Nov 24, 2006 | 02:28 PM
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a switch by the brake pedal in most cases.
 
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Old Nov 24, 2006 | 02:57 PM
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From: Easton,Ks
Originally Posted by EPNCSU2006
Oh ok, gotcha. I didn't even think of that. What did the older vehicles with the vacuum operated cruise control use for a brake pressure input, anything?
Vacuum Dump Valve + The Stop Light Switch.
 
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Old Nov 24, 2006 | 03:15 PM
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The vacuum dump valve doesn't interface with the ABS computer, that's what I was getting at.
 
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Old Nov 24, 2006 | 03:39 PM
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From: Easton,Ks
Originally Posted by EPNCSU2006
The vacuum dump valve doesn't interface with the ABS computer, that's what I was getting at.
But the Stoplamp switch and fluid level switch does.
 
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Old Nov 25, 2006 | 08:38 AM
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Nevermind.
 
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