04) VTEQ brake tester
04.1) VTEQ brake tester theory
04.2) Test procedure
04.3) The results of a brake test
04.4) Optinal pedal force meter
04.5) 4 WD test
04.6) Results review
04.7) Smart electronics
4.5) 4 WD test
The VTEQ brake tester can also test 4WD systems.
On a 4WD vehicle with the front and rear drive shafts connected through the transfer case without a differential or clutch pack the rear and front axles are connected. This means that if both front wheels move forward the two rear wheels want to move forward too, pushing the vehicle out of the tester.
The machine has a standard feature to still be able to still test the brakes on such vehicles. When the 4WD button is selected the electronics will drive one roller set forward and one reverse. The drive shaft to that axle will now not rotate. The forward turning wheel's brake force will be measured while the reverse rotating wheel is ignored. During the next cycle both wheels' direction will be reversed, and again the forward turning wheel will be measured.
The results of both individual measurements will be compared and shown as one measurement in a graph.
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