Contents: Checking the brake system status…↓ Troubleshooting the Brake System…↓ High beam indicator light ↓ Battery charge indicator light ↓
This indicator light can signal in different ways.
The light comes on when the handbrake is applied. For this purpose, there is a contact switch in the handbrake lever, which closes the contact when the handbrake is applied.
The pressure in the brake circuit is controlled by two brake light switches (near the master cylinder). If the brake circuit loses hydraulic fluid, the pressure there drops. A pressure difference arises between the two brake circuits: the serviceable one and the faulty one. The corresponding brake light switch gives an impulse to the signal lamp, and it lights up.
There is another option for a brake system control device: a signal is given about the decrease in the fluid level. In this case, the brake fluid tank cap has a float and a contact switch, which, when the level in the tank decreases, closes the current circuit to the lamp.
Checking the brake system status indicator light switch
In a car with two brake light switches, the operation of the lamp is checked when switched on: when the handbrake is released, the lamp should light, and after the engine starts, it should go out. You can also check the so-called pressure difference reading. In this case, proceed in the same way as when bleeding the brake system.
Fix the car in place. During the check the handbrake should not be tightened.
Start the engine and let it idle.
Open the bleed valve on the left front cylinder.
The assistant presses the brake pedal. The warning light should now flash.
Keep the brake pedal pressed. Close the bleed valve. Otherwise, air will enter the brake system.
The same check is carried out by opening the bleeding valve at the front right wheel brake.
Finally check the brake fluid level; top it up if necessary.
Troubleshooting the Brake System Monitoring Device
If the indicator light does not go out, check the brake fluid level in the tank.
If the brake fluid level is low, see section "Checking the brake fluid level", chapter "Brakes".
Next, check whether the released handbrake lever presses on the pin at the bottom of the contact switch.
If not, disconnect the contact switch and adjust its position.
If the defect was not detected, you should also check the entire length of the wire leading to the control lamp.
If the warning light does not light at all, this may be due to the following reasons: open circuit, defective board and lamp, stuck contact switch (only when checking the fluid level).
High beam indicator light
Only when the high beam or headlight signal is switched on does the high beam indicator lamp receive voltage.
Battery charge indicator light
When the engine is running, the control lamp should not light. If the lamp does not light when the ignition is turned on, this also indicates a defect. For troubleshooting, see the section "Troubleshooting the Battery and Generator", chapter "Generator".
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