Brake lights on 2003 Ranger quit working

Could also be brake light switch or clutch switch if manual transmission as those pedal will disengage cruise if it is set the brake light switch would be worth checking fiirst

Your bulb is bad,remove and take to Autozone,it's cheap in price,they may help you replace for free.Here's a link to the bulb,Walmart has them cheaper. Brake Light Mini Bulb 1992 Ford Ranger 2WD 4 Cylinders 2 3L FI AutoZone...

On these case,to troubleshoot these problem,there are solved help links.Click the link directly and refer the details to solve these problem yourself,with help of diagrams:------
Ford ranger cruise control not working?

http://technoanswers.blogspot.in/2012/02/ford-ranger-cruise-control-not-working.html

----------- Horn and Cruise control quit working?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working.html

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Horn and cruise control not working on Plymouth Grand Voyager?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-not-working-on.html

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Horn and Cruise control quit working on 2003 Jaguar S-Type? http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working-on.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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Cruise control stop working on 1994 Ford ranger? http://technoanswers.blogspot.in/2012/02/cruise-control-stop-working-on-1994.html

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Cruise control not working? http://schematicsdiagram.blogspot.com/2011/12/cruise-control-not-working.html

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1996 Ford Explorer: Cruise Control Wiring Diagram?

http://schematicsdiagram.blogspot.in/2012/06/1996-ford-explorer-cruise-control.html
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These will help.
Thanks.

I would check for power at the brake light switch first.

I would check the brake light switch that is located on the top of the brake pedal. While the brakes would work, the brake lights wouldn't.

You need to check the brake switch on the brake arm under the dash the arm is screwed in and gets loose over time, the switch is $15.00 dollars and is easy to replace, with the wires pulled off of the switch unscrew the switch counter clockwise till the switch comes out then replace it in reverse order screw in till the plunger pushes against the brake arm, when you press on the brake pedal the brake light should come on, this is assuming you have checked the brake switch fuse.

Found very detailed assistance and instructions, FREE on the Ranger Station Forum. It is nice being able to go on-line and find lots of free information from fellow American Ford Ranger owners and not be asked for $$$.

If you want the details let me know and I will send it to you for $19.95 or $39.95 if you want immediate response.

Heres a shot in the dark, cheap and easy worth looking at maybe

Brake light switch It is on the brake pedal

This isn't hard to do at all really and should be easy to procure the part from the local parts store. There is only one little screw holding it in

1. Raise and support vehicle.
2. 
   NOTE: Clean off dirt and foreign material that may have collected around the rear anti-lock brake sensor before removal. Remove the rear anti-lock brake sensor.

1 Disconnect the rear anti-lock brake sensor electrical connector. 2 Remove the bolt. 3 Remove the rear anti-lock brake sensor.

1. NOTE: Thoroughly clean the mounting surface. NOTE: Inspect the anti-lock brake sensor O-ring for damage; lightly lubricate the O-ring with axle lubricant. To install, reverse the removal procedure