Volkswagen Golf Service & Repair Manual: Vibration control system
| Using the vibration control system -VAS 6230 A- you can
perform more functions than just stationary balancing. |
| A special feature of this system is the testing of the
radial force of the wheel and tyre while rolling. |
| A roller presses against the wheel with a force of about 635
kg. This simulates the vertical tyre force against the road
surface during travel. |
| Radial and lateral run-out in the wheel and tyre and
differences in the stiffness of the tyre cause the vertical
force of the wheel to vary. |
| The -VAS 6230 A- detects and stores the position of the
maximum measured radial force in the tyre. Then the position of
the smallest distance between the wheel rim flange and the
centre of the rim is measured. |
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Note
Before working with a finish balancer, the mechanic needs to
have been instructed by the manufacturer of the balancer.
...
Radial and lateral run-out occur when the wheel and tyre do
not run absolutely true.
For technical reasons, 100% true running is not possible.
...
Other materials:
Removing and installing wheel housing trim, estate
Note
Removal and installation are described for the left
vehicle side. Follow same instructions for the right side as
appropriate.
Special tools and workshop equipment
required
...
Removing and installing ESP sensor unit -G419-
The lateral acceleration sender -G200-, the yaw rate sender
-G202- and the longitudinal acceleration sender -G251- are
installed together with the control unit for electromechanical
parking brake -J540- in the ABS control unit -J104-.
Th ...
Flat spots (from locking wheels)
Flat spots can result from an extreme brake application
which causes the wheels to lock, so that the rubber is worn off
at the contact patch between the tread and the road surface.
As the tyres slide over the road surface, friction generates
...
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Balancing wheel, balancing wheel with finish balancer
Checking radial and lateral runout of wheels and tyres, tolerances