Re: HELP: 93 Toyota Corolla vibration problem!

jonb55198@[EMAIL PROTECTED]
 wrote:
> NEW SYMPTOMS:
> 
> I had the tires changed out for brand new Yokoham Avid TRZ.  they were
> under warranty so it didn't cost me anything.  However, the vibration
> still persisted.  The 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.  The Passenger Front wheel is hot to
> the touch and will burn you.  the 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 are
> using the brakes.  I 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.  It may be
> locking up somehow.  But i noticed on local roads before the vibration
> starts, if the pedal is stiff, pump it a few times and it goes away...
> ie the brakes unlock.  The weird thing is I put brand new calipers in
> there 3k miles ago.... could one be defective?
> 
> Any help or insight would be appreciated.  Thanks.
> 
> -Jon
> 
The hose to the caliper may have internally collapsed causing the jam. 
To test it you need to jack up the wheel and feel the drag that is 
causing the heat, then loosen off the bleeder screw.  If the wheel 
releases, you have found the likely trouble.

A bad wheel bearing can also affect the brake caliper.  It can cause the 
rotor to drag against one side of the caliper which can overheat it 
also.  One other symptom of this can be a different feel in the brake 
pedal's first pump after a hard turn to one side or the other.  If the 
second pump seems higher or lower with the third pump getting back to 
normal, it can indicate a bad bearing.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08.  Some Canadian Bush Trip and Build
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