Brake light does not go on, fuse ok new bulbs stil no brake light when brakes are applied

Change bulbs, if not bulbs the brake switch which is normally just mounted above the foot brake lever

the third light works off the light cluster main wire at the rear so if there is power to the this light then there is a problem with the cluster link. check with a meter at the connector with the brake applied if power. then clean the plug to the cluster.

Do turn signals work ok? Do you have current at the brake switch?

The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.

The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!

Hi, your van does not use the signal filaments for the brake lights. You must have a wiring issue. Check for power at the brake light switch. If you have power there, the wire is broke from the switch to the S304 junction. If there is no power to the switch, the wire is broken between the fuse box and the switch. Please let me know if you have more questions, and thanks for using FixYa.

you don`t say if you checked the brake light switch(located at the base of the pedal)above it that it moves when applying the brakes.there should be power all the time on one wire and power only on the other wire with the brake applied.

Check to see if you are getting power to the fuse, Next check the power going to the brake switch. After you check for the power going into each location, and you find the one that's not getting the power, you may have a bad wire, also check to see if the brake switch is set up right to depress when applying brakes.

check all your fuses if fuses are good check brake lite bulbs see if they are blown. if bulbs are good get a test lite see if you have power to the bulb sockets have friend apply brake pedal you test power going into bulb socket if you have no power brake lite switch behind brake pedal could be burnt out. p.s dont forget to check all fese relays when checking your fuses.

Troubleshooting Procedures - Read Completely Before Beginning
(American Car) All Brake Lights Not Working

• Check System Fuse: A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is ok continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.
  
• Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
  
• Checking the Brake Light Switch: A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

Try looking under the dash, on the brake pedal arm there will be a switch, this is your brake light switch, verify power to it, then apply brake pedal and verify power is coming out.