23 October, 2008
A VIS-Check is a diagnostic machine that checks the brakes, steering and suspension of heavy trucks, then produces a Safety and Efficiency Report to guide maintenance activities.
The undercarriage of a vehicle is where the weight of a vehicle meets the road. Safety, fuel economy and tire life are all compromised if undercarriage components are not in top working condition.
Why use a machine to perform undercarriage diagnostics?
The VIS-Check machine makes performing undercarriage diagnostics:
• Safer by reducing manual labor
• Faster by automating brake testing
• Traceable by producing an inspection report
• More accurate by improving inspection methods
How does it work?
VIS-Check is comprised of two diagnostic devices; a performance based brake tester (PBBT) and a dynamic road simulator.
The PBBT measures the effectiveness of vehicle brakes by measuring the brake force produced by the truck through a complete braking cycle (apply, hold and release).
The road simulator helps technicians inspect the steering and suspension of a truck by dynamically loading these linkages consistent harsh over-the-road operation.
What type of report does the brake test produce?
The brake test produces a report that indicates the following for each wheel end:
• peak brake force
• compliance to DOT requirements
• left to right brake force balance
• rolling resistance with no braking
From this information the following can be identified:
• glazed or contaminated linings
• incorrect brake adjustment
• air distribution problems
• faulty slack adjusters
• drum out of round
• weak brake force
What type of report does the road simulator produce?
The road simulator produces an inspection report that identifies otherwise undetectable steering and suspension issues. These might include:
• worn tire rod ends and king pins
• spring pin, shackle & hanger issues
• loose cab or exhaust mounts
• defective shock absorbers
• loose wheel bearings
• broken springs
• worn bushings
For each undercarriage Condition identified by VIS-Check:
• an operating efficiency down-the-road Effect is provided
• a recommended maintenance Solution is provided
Is VIS-Check difficult to operate?
Not at all. Technicians require less than an hour of training to operate VIS-Check
What types of businesses operate VIS-Check?
Repair Shops – to improve the quality of service they provide.
Fleets – to improve the safety and efficiency of their vehicles.
Inspectors – to ensure vehicle compliance with DOT regulations