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

On May 2, 8:09=A0am, jonb55...@[EMAIL PROTECTED]
 wrote:
> Hi Group,
>
> Here is an update just to keep you all interested. =A0I replaced the
> caliper and rotor on the problematic side under warranty. =A0I figured
> that the rebuilt caliper that was installed 3k miles ago was crap
> (they often are). =A0This did NOT fix the problem. =A0So, I called
another=

> mechanic that suggested that the atmospheric valve in the brake
> booster may be going bad. =A0I 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. =A0Even without power brakes, that
> wheel still heated up. =A0Therefore, 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. =A0thanks again.
>
> On Apr 8, 12:21 pm, jonb55...@[EMAIL PROTECTED]
 wrote:
>
>
>
> > Hi,
>
> > I have a 1993ToyotaCorollawith 265k miles on it. =A0There 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. =A0If you only slow down, to local road speeds
> > (30-40mph) and then speed up again, it will still be present. =A0The
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. =A0it happens in 30s, 40s or 50s)
> > - i put in brand new front rotors and this did not cure it.
>
> > Please help. =A0Email me with any advice that you can. =A0Thanks!
>
> > -Jon

I would also check the freeplay in the pedal, make sure you have
enough.  Also make absolutely sure that you do not have a wheel
bearing issue.  check your list as well though those are all
possibilities.

good luck

nate