Antilock brake problem

  • Thread starter Thread starter Lionel
  • Start date Start date
L

Lionel

I have a '96 Dodge grand caravan. After replacing the driver side cv
axle, the abs brakes activate when the van slows to below 20 mph. The
wheels aren't locking up or doing anything that should cause them to
activate. It's happens consistently as soon as we get below 20 mph.
Could the replacement of the cv axle have anything to do with it?
As soon as the abs activates the vans sort of "coasts" a little bit
since the brakes let loose and start pumping which is why I need to
fix this ASAP.
Lionel
 
Lionel said:
I have a '96 Dodge grand caravan. After replacing the driver side cv
axle, the abs brakes activate when the van slows to below 20 mph. The
wheels aren't locking up or doing anything that should cause them to
activate. It's happens consistently as soon as we get below 20 mph.
Could the replacement of the cv axle have anything to do with it?
Click to expand...

Uh, yep. The tone ring for the ABS (part of the sensor mechanism that
allows the ABS computer to determine when a wheel is about to skid) is on
the CV joint nearest the wheel--part of what was replaced. If you got an
axle without a tone ring, or if the tone ring is misaligned, or if the
pick-up sensor was damaged during the swap, or if the wires to that sensor
were damaged....
As soon as the abs activates the vans sort of "coasts" a little bit
since the brakes let loose and start pumping which is why I need to
fix this ASAP.
Click to expand...

Get it in immediately.

--Geoff
 
Lionel said:
I have a '96 Dodge grand caravan. After replacing the driver side cv
axle, the abs brakes activate when the van slows to below 20 mph. The
wheels aren't locking up or doing anything that should cause them to
activate. It's happens consistently as soon as we get below 20 mph.
Could the replacement of the cv axle have anything to do with it?
As soon as the abs activates the vans sort of "coasts" a little bit
since the brakes let loose and start pumping which is why I need to
fix this ASAP.
Lionel
Click to expand...


The "tone ring" pickup for the ABS sensor is located on the CV axle. If
the replacement CV axle did not come with a tone ring, or you didn't
transfer the tone ring from the old axle to the new, then the ABS
system will not work correctly. I think it should set a code and disable
itself in that case, however.

The other possibility is that the new axle has a tone ring that doesn't
match the tone ring on the other axle (different number of slots) and
thus gives a false reading that one wheel is turning slower or faster,
which the computer interprets as slipping wheels during braking.
 
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