Re: UPDATED INFO -- HELP: 93 Toyota Corolla vibration problem!

Hi Group,

Here is an update just to keep you all interested.  I replaced the
caliper and rotor on the problematic side under warranty.  I figured
that the rebuilt caliper that was installed 3k miles ago was crap
(they often are).  This did NOT fix the problem.  So, I called another
mechanic that suggested that the atmospheric valve in the brake
booster may be going bad.  I disconnected the booster from vacuum and
taped off the lines so that engine performance would not be hindered.
This did not fix the problem either.  Even without power brakes, that
wheel still heated up.  Therefore, we are down to the following...
please comment:

1. the slides the caliper rides on may need lubricating.
2. the master cylinder is bad.
3. there is some obstruction in the hardlines

I'll keep you posted.  thanks again.




On Apr 8, 12:21 pm, jonb55...@[EMAIL PROTECTED]
 wrote:
> Hi,
>
> I have a 1993ToyotaCorollawith 265k miles on it.  There is a
> vibration that has the following symptoms:
> - it only occurs on the highway
> - it starts gradually and increases in severity, then eventually fades
> away and disappears within 10 miles.
> - it happens only occasionally, seemingly randomly, and when it does
> happen it happens at all speeds, not just a certain speed
> - it appears to come from the front of the vehicle.
> - you can feel it in the steering wheel AND the brake pedal
> - it does not happen on local roads or at local roads speed
> - when the vibration starts, you must bring the car to a complete stop
> to get rid of it.  If you only slow down, to local road speeds
> (30-40mph) and then speed up again, it will still be present.  The car
> must come to a complete stop in order to proceed without a vibration
> - it happens in the cold and warmish weather (here in boston is in the
> 40s and 50s now.  it happens in 30s, 40s or 50s)
> - i put in brand new front rotors and this did not cure it.
>
> Please help.  Email me with any advice that you can.  Thanks!
>
> -Jon