I have the same problem with my 94 and I think that the problem lies with the stearing column, my column the flasher button got broke and now the tilt wheel wont work and eversence that happened my flashers won't work right.
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.
To make the hazard lights alternating flash, a kit called a wig wag is added to the flasher system. To have actual strobe lights, then a strobe kit with its own light has to be installed.
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 the lights come on but do not flash, replace the flasher relay. If they will not come on check the fuses.
The hazard flasher on a 2001 Toyota Camry is located under the dash, near the hood release. It triggers the hazard lights to flash and regular intervals to notify other drivers.
it may be a loose connection on the back lights give a good firm push on the connectors
If you just barely touch the brake pedal the brake lights will come on but the brakes will for all intent and purpose not be applied.
If lights light up but do not flash, then need to change the flasher, if no light at all chk all fuses first.
Theres a bad earth due to corrosion.
Answer You might want to check your flasher relay which is under the dash.
You have a bad relay. Your blinkers run on a different relay than you hazards do.
Try replacing the turn signal flasher