Re: A transistorized CV Joint?

[Neil Trama <tramane@actonline.com.au>]

M Connors wrote:
> 
> Hi.
>     Picking anyone's brain out there for their thoughts.  Recently my V8
> has started exhibiting strange behaviour when backing up.  What is
> happening is the driver front wheel is locking up. This occurs only in
> reverse and only after the brakes are applied.  So long as I don't touch
> the brakes the car is fine during backup.  The minute I even slightly
> tap the brakes, causes the driver front wheel to completely lock up and
> stay locked (even on dry pavement).  Once this occurs the only way to
> free up the wheel is to place the car in drive and pull ahead.  The
> wheel then resets and is fine again.  It is interesting to note that
> when driving forward and applying the brakes the car is fine.
> Troubleshooting thus far has yielded the following observations:
> 
>     1. Front Driver Brake Pads in excellent shape.
>     2. Rotor in excellent shape with no imperfections
>     3. When applying the brakes no pulsating (translation: no warped
> rotors)
>     4. ABS activated/deactivated yields same results
>     5. No brake drag (as far as I can tell)
>     6. Noted inner CV Joint boot torn driver's side(could this be a clue
> ???).
> 
> Was wondering could an inner or outer CV Joint exhibit this type of
> locking phenomonon?  It seems that by applying the brakes induces torque
> on the driveshaft which causes something to lock within the driveshaft
> or differential.  It is only on this one wheel?  Has anyone seen or
> heard of a CV Joint lock up in one direction only?   I guess the
> alternative would be my differential? (say it isn't so....)  Any
> thoughts on this subject would be greatly appreciated.  Thanks in
> advance.
> 
> Mark
Had this happen once. 1 of the brake caliper bolts had come out. During
forward travel the caliper tended to pull itself toward the hub
centreline. In reverse the caliper swung out and locked against the road
wheel.
                                       Neil