34 00 ... Instructions For Brake Testing

34 00 ... Instructions for brake testing for E90 / E91 / E92 / 84 (AWD)

Manufacturing period: as of volume production launch
1. Vehicles with manual gearbox and xDrive:

Important!
Before driving onto the dynamic brake or power analyzer), switch off the Hill Descent Control (HDC) and keep it switched off while testing the brakes.
The HDC indicator lamp must not light up!
It is possible for the HDC indicator lamp to go out or not to light up even when HDC operation is activated. This may be because HDC is temporarily unavailable due to high brake temperature.
Do not select a gear and do not accelerate. Otherwise damages occur to the test stand or vehicle!

Pressing the accelerator pedal causes the multi-plate clutch in the transfer case to close, even in Neutral. Consequently the stationary axle is also driven, and the vehicle surges from the analyzer. Because the front and rear axles are now coupled, the axle to be tested then increases the brake force until the analyzer is shut down.

2. Vehicles with automatic transmission and xDrive:

Important!
Before driving onto the dynamic brake or power analyzer), switch off the Hill Descent Control (HDC) and keep it switched off while testing the brakes.
The HDC indicator lamp must not light up!
It is possible for the HDC indicator lamp to go out or not to light up even when HDC operation is activated. This may be because HDC is temporarily unavailable due to high brake temperature.
Carry out brake testing with selector lever in N position (Neutral) only.
Do not accelerate when the rollers start up.

During roller operation pressing the accelerator pedal in selector lever position N (Neutral) has no damaging effect.

Selecting a gear causes the transfer case clutch to close when the analyzer rollers start up. Consequently the stationary axle is also driven, and the vehicle surges from the analyzer. Because the front and rear axles are now coupled, the axle to be tested then increases the brake force until the analyzer is shut down.