Faulty ABS unit .
No, the red brake warning light will come on.
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.
check the brake fluid level. check all the brake linings for thickness.
3mm
check your brake fluid it is probably low
there are a bunch of lights all over the dash on a '86 SL. Does this light come on near the fuel gauge? Is it an oxygen sensor light? Does this light come on the bottom of the instrument cluster? Is this light RED? There are several warning lights on the bottom row...emergency brake light, brake wear warning light, brake fluid reservoir warning light,ABS warning light....? You really need to be more specific as to the location and appearance of this light. If you have your owner's manual handy, take a look at that. If you don't have one, I suggest you order one from MB. They come in very handy.