Attention! Brake fluid is an aggressive component for the skin, especially for the eyes, is acutely toxic when ingested and destroys the paintwork. It is extremely hygroscopic, absorbing moisture from the environment, which leads to the loss of its functional properties.
Use only DOT4 fluid.
Mixing different types of fluids such as DOT3 or DOT4 with DOT5 may cause brake system failure.
Reservoir for brake fluid and clutch fluid - one, located in the engine compartment under the cabin air microfilter box on the left side (driver's side). The screw plug has a vent hole that must be kept clean at all times (open). The tank is transparent (pic. 2.23), which allows you to monitor the level of liquid in it.
Lowering the level below the mark «MIN» (2) signaled to the driver by the indicator light on the instrument panel and the message «Check Brake Fluid».
To visually check the brake fluid level of the BMW X5 E53, it is necessary to remove the microfilter box from the driver's side. The liquid level with the plug closed should be between the marks» MIN» (2) And «MAX» (1) and don't cross them.
The brake fluid level may drop slightly due to worn brake pads. A significant decrease in the level of brake fluid indicates its leakage from the system. It is necessary to stop the operation of the car and urgently identify the place of fluid leakage.
In the process of visual control of the liquid level in the tank, it is necessary to check the functioning of the contacts of the float level control mechanism.
Check the functioning of the control indicator in the following order:
- set the ignition key to position «1»;
- release the parking brake lever:
- press the button in the tank stopper with your finger;
- monitor the indicator light on the instrument panel (need a second person or a mirror mounted on the back of the seat). If the lamp does not illuminate, check the electrical circuits.
- Reinstall the air conditioner microfilter box. Merged (spilled) brake fluid must be recycled.