Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brakes, Testing, All Wheel Drive (AWD)
Testing on a one-axle roller test stand for AWD vehicles
During this test, the wheels of one axle are driven in opposite directions, to prevent delivering power to the other axle.
The rolling speed must be at least 4 km/h (2.4 mph).
The rolling speed must not exceed 6 km/h (3.7 mph), otherwise, the brakes may lock up due to the roller start-up delay (EDL regulation).
If the test speed exceeds 6 km/h (3.7 mph) the Torsen differential will be destroyed!
The Audi approved test stands fulfill these requirements.
Test on a one-axle roller test stand
The rolling speed must be at least 4 km/h (2.4 mph).
The rolling speed must not exceed 6 km/h (3.7 mph), otherwise, the brakes may lock up due to the roller start-up delay (EDL regulation).
The Audi approved test stands fulfill these requirements.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.