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ABS activates under medium braking and 100% traction

9702 Views 14 Replies 6 Participants Last post by  MikeyDoubleDEE
Hello there,
I've searched the forums a bit and couldn't find an answer - sorry if this has been covered.

I'm having an issue with my ABS:
Under arguably 'medium' braking, and with the slightest turn of the wheel, the ABS activates even though all tires are on dry pavement and have 100% traction. This actually could be quite dangerous if I have to increase braking while steering because sometimes the ABS activation can increase stopping distance while traction is 100%.

All tires are at the correct PSI

My brake light is on, however, so that might possibly be a symptom of the underlying issue. (It's the red "BRAKE" light that is on....not the ABS light)

Another side question...what are all factors that could turn on the red "BRAKE" light. (My parking brake is not engage, although maybe I should inspect the switch...)

Thanks all!
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The brake light is for the e brake. Does your truck have the "T" handle ebrake. I recall having to bump mine often to keep it from being lite.

The rear axle on my Hardbody (which essentially is a gen1) has a suspension lift proportioning brake valve (my own term). As you stomp on the brake the truck will drive and the rear end lift. As the rear end lifts the it will tend to skid if the same amount of brake force is applied. Thus this little gizmo reduces the amount of brake pressure to the rear wheels as the rear end lifts. If it is not functioning properly (like missing the spring) then then back end will tend to lock up and force the ABS to start pulsing. One thing to check.
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I think he said that he was not throwing up a ABS warning light.

Low brake fluid, you should have already checked that.
Have you taken a look at the sensor and wire. Could be a cut wire. Could just need a brush off the tone ring.
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