The most common cause of that is the front brake rotors are out of round / warped. Replace rotors are have them turned.
The Anti-Lock brakes pulsate so the brakes do not lock up (anti) and cause the vehicle to side out.
depress the emergency brake. That will shut off the DRLs.
Do you have anti lock brakes that might be it if not your rotors maybe warped
My 92 Silverado right front brake sticking why
4 time ASE certified tech here, warped front brake rotors will make your brake pedal pulsate and steering wheel shake when braking. most noticed when moderate braking at 40 - 50 mph.
Could be that the rotors are "out of round" and pulsate Could be a malfunction in the ABS system
what does it mean if my brake light is blinking on and off when its pushed down in my 1999 Chevy silverado
On my 03 Chevy Silverado I just added brake fluid and the message turned off.
top of brake pedal
You have warped the brake rotors. Driving fast & hard stopping or riding the brake will cause this when the rotor is hot and you are stopped with heavy pressure on the brake pedal. Replace rotors and pads.
Yes, you will feel the brake pulsate. Just keep full steady pressure on the pedal and steer around the accident if possible.