my mom has a 1992 olds toronado trofeo. the car ran/drove fine before
she parked it due to a bad power steering pump. It sat for 3 months in
spring/summer weather without being driven. We fixed the powersteering
pump but now there is a severe pulsation in the brake pedal when coming
to a stop and the car shakes violently. I changed the front rotors and
cleaned up the back ones but this had no effect on the problem. Could 3
months of sitting have warped the back rotors? thanks in advance
It is fairly easy to see if your front discs (rotors) have a problem. Use a
dial indicator on both
sides and see if you are out of true..
Rear discs are the same.
If you are NOT out of true, either in thickness variation or in out of plane
you have to look for something else.
Pulsation is reasonably well understood. but sometimes the novice will
etc. for pulsation...
Measure your discs.. Find out what is going on. Dont just react with
well, i changed the pads on the front and still no difference so i went
to the back and sure enough, the back rotors were shot. they were very
visibly warped... guess i should have listened to my girlfriend in the
first place when she told me to check the back! Thanks for the help guys
Just for reference in the future, if it's a problem in the back you will
feel the vibration through the seat, if it's a problem with the front
you will usually get a shaking in the steering wheel. Not always perfect
but a good rule of thumb.
You can tell if it's the rear (HOWEVER: I think new pads along w/new
rotors on front will fix it.) by carefully applying the emergency brake to
stop car. DO NOT apply them hard at much above 35 mpg, as the rear end will
begin to skid. If they do not pulsate the car, it's the front ones
troubling you. sam
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