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Old 09-29-2019, 09:50 PM   #1
Scott Turchin
 
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Default ABS and BRAKE lights on...

1996 4x4


I was expecting to find wheel sensors, rockauto.com shows them for my truck but there are no wires running back to the rear.


So how does the ABS know when the wheels are locked up?


Lights are on, coincidentally 2 weeks after I did a brake job and bled the brakes, air bubble?


And I noticed a bleed valve on the proportioning valve under passenger side of bed....


But rockauto shows a speed sensor, is that separate?



I wish Bentley made a manual for this truck, the 1989-1998 book barely has any real information in it
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Old 09-29-2019, 10:22 PM   #2
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I haven’t had to troubleshoot any abs problems. Have you looked at the factory service manual? https://www.nicoclub.com/FSM/Hardbod...1_Truck/br.pdf
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Old 09-29-2019, 10:43 PM   #3
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ABS sensor is mounted on front of differential at driveshaft. Make sure the wire going to it isn't broken.
BTW, if the sensor is bad, you don't have to pull the yoke to replace it. Remove the bolt holding it to the bracket and just replace the sensor.
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Old 09-29-2019, 10:46 PM   #4
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Thanks, that gets me where I was almost at


I Found the solenoid and now I know where the sensor is, maybe time to change u-joints anyway
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Old 09-29-2019, 11:51 PM   #5
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Being OBD2 there should be a way to communicate with the ABS module to see what's going on. Most generic OBD2 readers won't do it but a more advanced one might. Sometimes the auto parts stores have one that can, sometimes not. It's a real crapshoot. I also wonder if there isn't a secret handshake you can do to get the codes out of it. For instance, older Toyotas have a second diagnostic connector under the hood that's for the cruise control, ABS and airbag modules. You jumper two of the pins with a paper clip then turn the key on and the lights for each module will blink out their codes if there are any.

I believe the ABS on most cars works by sensing rapid changes in wheel speed, but don't quote me on that. It may also use inputs from the speed sensor coming out of the transmission to look for discrepancies between wheel speed and output shaft speed but again, I'm not sure. I haven't dealt with many ABS problems at all. A lot of trucks just have the one sensor that goes into the pinion housing. The brake light also comes on when the fluid level in the master cylinder gets below a certain level, although I doubt you'd let it get that low in the first place. Sometimes it's as simple as the parking brake switch being bad of out of adjustment that will make it stay on all the time. I might even take it a step further and check for both reference voltage at the ABS sensor as well as for continuity in the signal wire between the sensor and the ABS module. You'll probably need a pinout of the ABS module connector to make that happen, but sometimes you get lucky and can go off the wire color.

I agree, bentley manuals are the cat's meow but they cater more to Euro cars. My old neighbor had one for his SAAB that he swore by...literally everything you'd ever want or need to know about it was in that book.

Good luck getting to the bottom of it.
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Old 09-30-2019, 08:57 PM   #6
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Check the brake fluid.
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Old 10-04-2019, 04:12 AM   #7
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Check the brake fluid.



Sometimes the simplist answer is the best answer.


Ironically after working on my VW it just dawned on me to do that, and I had just bled the back brakes and ABS solenoid so I checked it and voila it was low, new fluid and light goes out...


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