Hello... A few days ago, the brake and abs light came on (out of the
blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
but the common "shuddering", normally experienced when the abs is in
action, was not apparent. ...The next day, I fired up the Liberty, and
while driving down the highway, both lights (out of the blue, again),
went out.
.......I took the vehicle to the service manager, who told me, after
checking things out: "...it was odd to see both sensors for the brakes
go at the same time -- but they are working now." ??? ....What
could have happened? ...Jon

 

Johnny1000 did pass the time by typing:
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

Several possibilities. Salt got into the connector for the sensors
and caused a short. (Usually the Scantool will pull that as a sensor
failure, but not always.) Or the ABS compuer connector has gotten
salt/grime in it. (The scantool will call this all sorts of things
from pump failure to sensor failure, reason is it can't diagnose a
short in the harness)

First thing to do is pull each connector, clean with contact cleaner
(watch your paint, contact cleaner is also good paint stripper)
then pack the connector with dilectric grease.

--
DougW

 

Johnny1000 did pass the time by typing:
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

Several possibilities. Salt got into the connector for the sensors
and caused a short. (Usually the Scantool will pull that as a sensor
failure, but not always.) Or the ABS compuer connector has gotten
salt/grime in it. (The scantool will call this all sorts of things
from pump failure to sensor failure, reason is it can't diagnose a
short in the harness)

First thing to do is pull each connector, clean with contact cleaner
(watch your paint, contact cleaner is also good paint stripper)
then pack the connector with dilectric grease.

--
DougW

 

Johnny1000 did pass the time by typing:
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

Several possibilities. Salt got into the connector for the sensors
and caused a short. (Usually the Scantool will pull that as a sensor
failure, but not always.) Or the ABS compuer connector has gotten
salt/grime in it. (The scantool will call this all sorts of things
from pump failure to sensor failure, reason is it can't diagnose a
short in the harness)

First thing to do is pull each connector, clean with contact cleaner
(watch your paint, contact cleaner is also good paint stripper)
then pack the connector with dilectric grease.

--
DougW

 

The ABS is computer controlled and anything could knock it out.

The 'Master' brake failure warning light is a different animal!

When that comes on it means pull over and STOP if/while you still can.

It is then tow truck time!

Not, oh well I guess I should have it looked at, it's tow truck time
man!

The vehicle is not safe to drive with that light on. Period.

I had a cop totally freak out on me when he saw that read 'master
failure' brake light on even though I told him it was all new brakes the
day before and the light just didn't get reset because it needed to be
manually removed to reset and I just hadn't done it yet. (had a swollen
face with an abscessed tooth for an excuse, no go)

He even tested my brake pedal which was up nice and firm and the
emergency even worked perfect, no matter.

He wrote me up a ticket for an unsafe vehicle, went and physically
removed my license plates and called a tow truck.

That was expensive....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Johnny1000@webtv.net wrote:
>
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

 

The ABS is computer controlled and anything could knock it out.

The 'Master' brake failure warning light is a different animal!

When that comes on it means pull over and STOP if/while you still can.

It is then tow truck time!

Not, oh well I guess I should have it looked at, it's tow truck time
man!

The vehicle is not safe to drive with that light on. Period.

I had a cop totally freak out on me when he saw that read 'master
failure' brake light on even though I told him it was all new brakes the
day before and the light just didn't get reset because it needed to be
manually removed to reset and I just hadn't done it yet. (had a swollen
face with an abscessed tooth for an excuse, no go)

He even tested my brake pedal which was up nice and firm and the
emergency even worked perfect, no matter.

He wrote me up a ticket for an unsafe vehicle, went and physically
removed my license plates and called a tow truck.

That was expensive....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Johnny1000@webtv.net wrote:
>
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

 

The ABS is computer controlled and anything could knock it out.

The 'Master' brake failure warning light is a different animal!

When that comes on it means pull over and STOP if/while you still can.

It is then tow truck time!

Not, oh well I guess I should have it looked at, it's tow truck time
man!

The vehicle is not safe to drive with that light on. Period.

I had a cop totally freak out on me when he saw that read 'master
failure' brake light on even though I told him it was all new brakes the
day before and the light just didn't get reset because it needed to be
manually removed to reset and I just hadn't done it yet. (had a swollen
face with an abscessed tooth for an excuse, no go)

He even tested my brake pedal which was up nice and firm and the
emergency even worked perfect, no matter.

He wrote me up a ticket for an unsafe vehicle, went and physically
removed my license plates and called a tow truck.

That was expensive....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Johnny1000@webtv.net wrote:
>
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon

 

Any time the ABS light turns on it also turns on the red brake light so no
worries there. I am guessing that you got some metal fibers on your sensor
(don't know on those if it is in the hub assembly) and that told the
computer that you had a bad sensor (that will turn on the light). Then
while driving high speeds it was just enough to kinda clean that sensor
enough and all the reading went back to normal and the light went off.
Again this is just a guess.

Jeremy


<Johnny1000@webtv.net> wrote in message
news:25703-402F957F-234@storefull-3254.bay.webtv.net...
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon
>

 

Any time the ABS light turns on it also turns on the red brake light so no
worries there. I am guessing that you got some metal fibers on your sensor
(don't know on those if it is in the hub assembly) and that told the
computer that you had a bad sensor (that will turn on the light). Then
while driving high speeds it was just enough to kinda clean that sensor
enough and all the reading went back to normal and the light went off.
Again this is just a guess.

Jeremy


<Johnny1000@webtv.net> wrote in message
news:25703-402F957F-234@storefull-3254.bay.webtv.net...
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon
>

 

Any time the ABS light turns on it also turns on the red brake light so no
worries there. I am guessing that you got some metal fibers on your sensor
(don't know on those if it is in the hub assembly) and that told the
computer that you had a bad sensor (that will turn on the light). Then
while driving high speeds it was just enough to kinda clean that sensor
enough and all the reading went back to normal and the light went off.
Again this is just a guess.

Jeremy


<Johnny1000@webtv.net> wrote in message
news:25703-402F957F-234@storefull-3254.bay.webtv.net...
> Hello... A few days ago, the brake and abs light came on (out of the
> blue), on my Jeep Liberty. ...I tried the brakes on the slippery snow,
> but the common "shuddering", normally experienced when the abs is in
> action, was not apparent. ...The next day, I fired up the Liberty, and
> while driving down the highway, both lights (out of the blue, again),
> went out.
> ......I took the vehicle to the service manager, who told me, after
> checking things out: "...it was odd to see both sensors for the brakes
> go at the same time -- but they are working now." ??? ....What
> could have happened? ...Jon
>