Every time I step on my brakes my fuse blows and my brake lights stop working. I've replaced the bulbs and fuse but it keeps happening. I have a 1998 mitsubishi montero sport.

Try disconnecting both tail lights replace the fuse and see if it blows...if it don't connect one at a time and see what happens...also check you third brake light...

Because you have yet to get yourself a wiring
diagram & do the required testing to find a problem

You find a problem first--you have a symptom only

Why would you replace a fuse more than once?

Like watching them go up in smoke & cost you money

If the fuse blows on different trailers then it's all down to the vehicle. You either have incorrect wiring on the vehicle, a short OR the fuse is not of a high enough value to cope with the additional brake lights? You could try removing all the trailer bulbs EXCEPT the brake lights - e.g. if it's trying to power up the indicators too? That would stop the fuse blowing...... OR remove the brake bulbs from the vehicle & see if it operates the trailer without blowing...... Check the total wattage of ALL the brake lamps & see if the fuse is actually of a high enough rating? Be aware though that increasing the value of the fuse could cause damage elsewhere! As a rough guide a 25 watt bulb will pull around 2 amps at 12 volts - so 4 bulbs may pull up to 8 amps & clearly blow a 5 amp fuse! If in doubt take it to an auto electrician...... The wiring needs to be correctly protected!

Did you check the bulbs ? If they are Ok,then check you brake light switch which is under your brake pedal. Good luck

check fuses then brake light switch on padel

The horn and rear brake lights are on the same fuse. Eventually the horns rust out like on my 1998 CRV. Once I replaced the horns, I could put in a new fuse without it blowing every time I sounded the horn. Problems still remain, namely: the cruise control does not engage and the remote start only starts the engine that runs for two seconds then dies. Still looking for an answer. It's a "Code Alarm" with Codestart dated 11/24/99.

check the fuse for the brake lights. The brake lights and siganl lights use the same bulb filament. The parking and running lights use a dimmer filament in the bulb. There are 2 filaments.
Your brake lights work through the multifunction switch which operates the signal lights. If the signal lights work, you may have a bad brake lamp switch which is on your brake pedal arm.
Let us know what you find.

I would look for a wiring short in the trunk at the taillamp area, or, inspect the sockets for the taillamp bulbs for corrosion. In any case, you have a short circuit in the trunk area, also check the wire that comes from the body & goes up the trunk hinge on the driver side; that wire may be chafed, and it may be shorting out. Hope this helps; please get back to me if you need any further assistance.

First ensure the bulbs are fine.

Check and replace the fuse in your fuse box.

If it keeps blowing after replacing the brake lights fuse, then there is a short on the wires, you need to check wiring.

If fuse is ok and there is no brake light check wiring to the lights, there is a broken connection or an open wiring to the brake lights.

Note: brake lights are usually not dependent from tail lights, they have separate wiring.

Start by replacing your brake light bulbs. If it still blows the fuse, them your brake pedal switch. If it still happens then you have a shot circuit in your wiring between your fuse panel and your brake lights.