Brake pedal thumping while stopping?

While I am slowing in my 95 odyssey, my brake pedal thumps. It seems that
the anti-lock mechanism is engaging and I am in no way to that level of
braking. I am coming to a very easy stop. I can also hear some kind of a
pumping noise under that hood, something this is firmiliar after starting
the van. Has anyone seen/heard this before?

Thx, L

 

False ABS activation, which sounds like what you have, is usually due to a
mispositioned or more likely a bad, wheel sensor.

Rgds, George Macdonald

"Just because they're paranoid doesn't mean you're not psychotic" - Who, me??

 

Have you had any brake work done lately?

 

There is a story behind this. I just replaced my CV joints and everything
seemed to go back in fine (famous last words). I did not remove the sensors
etc. When I eyeball the sensor it seems to be centered half between the grid
that is on the axle. Does that make sense?

Larry

me??

 

I have made some changes to my email, spam is crazy out here. Anyway, I did
just replace the cv joints, and everything went together without a hitch,
well so it seemed. I did remove the wheel and noticed that the sensor is
round and it seems that the teeth on the axle ride about half way between
the sensor.

Larry

 

Not sure what you mean by "centered half" - it should line up almost
perfectly with the teeth on the pulsor with a clearance of 0.4 to 1.0mm.
Also check for damaged teeth. Did you service the C/V joints yourself or
get replacement axles? It wouldn't be the first time that someone was sold
axles with the wrong C/V joint casing with a different alignment on the
pulsor teeth.

Rgds, George Macdonald

"Just because they're paranoid doesn't mean you're not psychotic" - Who, me??

 

All, I still need to finish assembly of the drivers side, I have been taking
it slow. I will check the alignment on that one. I used an electric impact
gun to tighten the 36mm nut. Maybe I should use a large socket wrent /
torque wrench. Could it be possible that I do not have it pulled into the
rotor enough? Like I said the sensor seems to be centerd on the inside edge
of the teeth. A neighbor did the rebuild and I did the R and R...

Thx for your input!

Larry

 

Looks like you have not inserted half shaft all the way into the rotor or
they sold you a "wrong" half shaft.
I think that wheel sensor HAS to be situated exactly centered above the
teeth.

 

dimmi, thx for the reply. i am in a diffucult position because my neighbor
rebuilt the shaft for me. I am not sure if he just put a new rubber dust
cover on em or what. I do know the shaft was very clean when he brought it
over. Is that a standard way of rebuilding them? Also, I have the bolt
(36mm) very tight, was concerned about going ny tighter. I will check with
him this weekend and see if he actually just cleaned them up or replaced the
boot...

thx though for the input....

Larry

 

Well, cant really tell you anything else except axle nut has to be torqued
with a torque wrench and not "very tight" but exactly as it needs according
to the specs.