Re: HELP: 93 Toyota Corolla vibration problem!

On Apr 18, 10:19=A0am, N8N <njna...@[EMAIL PROTECTED]
> wrote:
> On Apr 18, 3:48=A0am, " krp" <krp24...@[EMAIL PROTECTED]
> wrote:
>
>
>
>
>
> > "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
>
> >news:1KKdnfi__tcjSprVnZ2dnUVZ_j-dnZ2d@[EMAIL PROTECTED]
>
> > >> I had the tires changed out for brand new Yokoham Avid TRZ. =A0they
w=
ere
> > >> under warranty so it didn't cost me anything. =A0However, the
vibrati=
on
> > >> still persisted. =A0The new additional symptoms are as follows:
>
> > >> 1. when the vibration occurs, you can get out of the car and feel
the=

> > >> temperature of the steel wheels. =A0The Passenger Front wheel is
hot =
to
> > >> the touch and will burn you. =A0the rest are cool to the touch.
>
> > >> 2. the brake pedal has less travel and feels stiffer.
>
> > >> 3. more gas pedal effort and reduced gas mileage during periods of
> > >> vibration.
>
> > >> 4. this problem will start randomly and is not dependent on if you
ar=
e
> > >> using the brakes. =A0I was on the highway at 1AM and didn't use the
> > >> brakes for 30 miles and it still started.
>
> > >> Now here is what I think, although i'm not a mechanic... I think it
> > >> has something to do with the front passenger-side caliper. =A0It
may =
be
> > >> locking up somehow. =A0But i noticed on local roads before the
vibrat=
ion
> > >> starts, if the pedal is stiff, pump it a few times and it goes
away..=
..
> > >> ie the brakes unlock. =A0The weird thing is I put brand new
calipers =
in
> > >> there 3k miles ago.... could one be defective?
>
> > >> Any help or insight would be appreciated. =A0Thanks.
>
> > >> -Jon
>
> > > Replace both front brake hoses, replace the brake fluid, and bleed
the=

> > > brakes.
>
> > =A0 =A0 That may not get the problem. Most tire places use a "static
bal=
ance."
> > system. Okay for some purposes on newer cars, but this car is 15 years
o=
ld.
> > Wheels on the 93 Toyota were not exactly the strongest. The wheel
needs =
a
> > dynamic balance and CLOSE inspection to see how true it is running. On
t=
he
> > older cars potholes can tend to cause the wheels to become bent. I'd
sta=
rt
> > there. Also the Corolla of the 90's was famous for bad wheel bearings.
W=
e
> > could assume it has disc brakes on the front wheels. A close
inspection =
of
> > the spindle and the rotor are next. Not knowing how many miles are on
th=
e
> > car (generally we can assume over 100,000) at this age as a minimum -
yo=
u
> > have all sorts of culprits along the way as possibles. Maybe even
> > combinations. That's without getting to any suspension parts. Look at
th=
e
> > most likely first.
>
> > 1. Bent wheel.
> > 2. Bad wheel balance.
> > 3. Bad bearing.
> > 4. Bad rotor or worn spindle.
> > 5. Suspension parts. (there are several high failure parts on the
coroll=
a)
>
> > =A0 =A0 The brake son the Corolla CAN be bad, but have been one of the
m=
ore
> > reliable things about Toyota. The only question here is how many times
t=
he
> > rotors were turned and how accurately. MANY brake shops are butchers.
Th=
e
> > cut rate places often have poorly trained KIDS doing the job. Nobody
sho=
uld
> > be surprised when they screw up. If too much is taken off a rotor when
i=
t is
> > turned, they get sort of square after a while. As the too THINK rotor
he=
ats
> > up it tends to go our of round.
>
> > =A0 =A0 Look at the most likely =A0first. Brake lines are down the
list =
pretty
> > far. Since it is only ONE side that seems to be causing the vibration
I
> > would look for the most likely things first. You MAY wind up with a
bad
> > brake hose, but I'd look elsewhere first. Besides you can't really
tell
> > about the hose even when you remove it. Not unless it is obviously
> > collapsed. Hardening of the brake hose arteries is not impossible,
just
> > unlikely.
>
> > =A0 =A0 You can start to see the problem when you spin up the wheel on
t=
he car.
> > Most tire stores will CHECK the wheel balance OFF =A0the car for free.
> > Especially the store where you bought the tires.- Hide quoted text -
>
> I'd say it's VERY likely a hose or caliper based on the symptoms
> posted. =A0Sounds like dragging pads which have caused the rotor to
> warp. =A0So probably he will end up with a new hose, caliper, and rotor
> before the problem is solved. =A0I say caliper because even if the hose
> is the cause of the problem the seals in the caliper may have been
> toasted by the heat and I would replace all three just to be certain
> that I've got the problem and won't end up with another one shortly.
>
> nate- Hide quoted text -
>
> - Show quoted text -

I agree, I had this happen, if the brakes drag, after driving on the
highway, the rotor will overheat and warp and cause a vibration due to
the brakes dragging on a warped rotor..

fix the dragging brake and you'll also get better gas milage.

Mark