Faulty ABS unit .
No, the red brake warning light will come on.
If the brake and fluid warning lights come on in your Audi TT when the brake pedal is pressed, it may indicate a problem with the brake fluid level or a potential issue with the braking system itself, such as worn brake pads or a malfunctioning sensor. Check the brake fluid reservoir to ensure it is at the proper level, and inspect for any leaks. If the fluid level is adequate and the problem persists, it’s advisable to have the vehicle inspected by a qualified mechanic to ensure safe operation. Ignoring these warning lights could lead to serious brake failure.
Check your brake fluid level in the brake master cylinder in your engine compartment when it is low your brake warning light will come on
Low brake fluid possible
Brake fluid in reservoir below acceptable level.
You have a wiring issue or a bad brake light bulb.
The red " BRAKE " warning light in your dash comes on if the emergency brake / parking brake is on , or if the BRAKE FLUID LEVEL in the brake master cylinder ( located in your engine compartment , near the firewall , on the drivers side of the engine compartment ) IS LOW
Low brake fluid, pads worn down, other problems.
The ABS and brake warning lights will come on in a vehicle when an error is detecting in the he system. This can range from low fluid or pressure to sensor and component failure.
3mm
check the brake fluid level. check all the brake linings for thickness.
check your brake fluid it is probably low