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If you will notice the hazard lights are not actually flashing, reason being, the hazard flasher relay is defective. Replace it.
A flasher relay interrupts power to the hazard lights making them flash. The relay can be a dedicated relay or it can be the same relay that operates the turn signals. Depends on the make, model, and year of the vehicle.
if you mean: "why do hazard lights flash when brakes are on", then the answer is because vehicles are equipped with a hazard light relay that supercedes the brake lights. This way, slow moving vehicles can operate under hazard lighting.
The turn signal and the hazard lights each have their own relay. Sounds like you have to replace both relays.
Bad switch/relay?
Relay contacts welded together
Defective Flasher Relay, replace it. One relay operates the Hazard Lights and the other operates the turn signals. Be sure and replace the correct one.Defective Flasher Relay, replace it. One relay operates the Hazard Lights and the other operates the turn signals. Be sure and replace the correct one.
Check the fuses and it may be the flasher relay as they have 2 try turning the hazard lights on and off a few time as you relay may be stuck.
it could be a bad relay
Flasher relay bad. This is a separate flasher relay from the one controlling the hazard lights.
Faulty hazard lights on a 1994 Acura Integra can be fixed by replacing the hazard light relay or the defective bulbs. Hazards are used to notify other drivers that the vehicle is in distress.
It's attached to the back of the hazard light button.