No brake lights

Step on the brake and if you have the mid (3rd )light on replace flasher relay and check flasher switch. Here is a guide and the brake light wiring diagrams so you can see how it works.

https://www.2carpros.com/articles/brake-lights-not-working

Check out the diagrams (Below). Please let us know what you find.

Thanks, sounds like I am on the right track. I have replaced the relay and am going to replace the flasher switch. How hard is this switch to replace? It looks like the steering wheel has to come off. BMRFIXIT

If the 3rd light is not working check for power at the brake light switch if it work continue on with your check good luck

Yes, the steering wheel has to come off.. Which means the air bag has to be dealt with as well as the clock spring in the top of the column/wheel.
1. Make sure the lever is in the center or the OFF position.
2. Disable the Supplemental Inflatable Restraint (SIR) system.

Caution: Refer to Battery Disconnect Caution in Service Precautions.

3. Remove the inflator module.
4. Remove the horn pad assembly.
5. Remove the horn switch.
6. Remove the steering wheel nut.
7. Use the J 1859-A in order to remove the steering wheel.
8. Remove the knee bolster.
9. Loosen the steering column bracket nuts.
10. Remove the two TORSO head screws from the lower column cover.
11. Tilt the cover down and slide the cover back in order to disengage the locking tabs. Lower the column cover.
12. Remove the two TORSO head screws from the upper column cover.
13. Remove the steering column lock set.
14. Remove the upper column cover.
15. Remove the two wire harness straps from the steering column wire harness.
16. Remove the Connector Position Assurance (CPA) retainer from the Brake Transmission Shift Interlock (BTSI).
17. Disconnect the steering column bulkhead connector from the vehicle wire harness.
18. Disconnect the gray and the black connectors of the switch from the column bulkhead connector.
19. Remove the two TORX head screws from the switch.
20. Remove the multifunction turn signal/hazard switch.
1. Install the multifunction turn signal/hazard switch.
1.1.Use a small blade screwdriver in order to compress the electrical contact. Move the multifunction switch into position.
1.2.Make sure the electrical contact rests on the canceling cam assembly.
2. Install the two TORX head screws on the switch.
- Tighten the screws to 6 Nm (53 inch lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

3. Connect the gray and the black connectors of the switch to the column bulkhead connector.
4. Install the steering column bulkhead connector to the vehicle wire harness.
5. Install the connector and the CPA retainer to the BTSI.
6. Install the two wire straps on the steering column wire harness.
7. Install the upper column cover.
8. Install the steering column bracket nuts.
- Tighten the nuts to 30 Nm (22 ft. lbs.).
9. Install the knee bolster.
10. Install the steering column cylinder lock set.
11. Install the two TORX head screws to the upper column cover.
- Tighten the screws to 1.4 Nm (12 inch lbs.).
12. Install the lower column cover.
13. Install the two TORX head screws to the lower column cover.
- Tighten the screws to 6 Nm (53 inch lbs.).
14. Make sure the lever is in the center or the OFF position.
15. Install the steering wheel onto the steering shaft.
16. Install the steering wheel nut.
- Tighten the steering wheel nut to 40 Nm (29 ft. lbs.).
17. Install the horn pad assembly.
18. Install the horn switch.
19. Install the inflator module.
20. Enable the Supplemental Inflatable Restraint (SIR) system.

There is a diagram of the switch/column attached below

Electrical problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic

Checked fuses, all good. No brake lights on either side of the roof mounted light.

Hello, do the lower brake lites work ok? I'd have to check the voltage circuit to the upper brake lite. Splice 220 is a junction for several brake circuits, don't have location for that splice. I'd have to track circuit from the brake switch, white wire.

Thank you both for your response. The problem was the brake lamp switch.
Wonderful site!

Jim

Replaced brake switch, fuses, bulbs; all rear lights work except BRAKE lights

If the high mount center brake light is coming On -check and test the turn and hazard switch the bottom lights goes thru this switch

The high mount center light is not coming on either

Recheck the brake switch adjustment and for power to it-

I currently have no brake lights! I have checked the fuses with a digital multimeter and they are good. I have replaced the brake light switch. My cruse control works just fine. My turn signals work just fine. If I use the trailed brake controllers manual switch the third brake light comes on. What do I check next?

Have you checked to see if you have power to the brake light bulbs when stepping on the brakes?Also you mentioned trailer lights did you install diodes on your brake circuit?I have seen them fail and cause the same thing to happen.

When I step on the brake peddle there is no power to the rear bulb connectors.

Before this happened, when I stepped on the brake the trailer brake controller would light the digital readout. Now nothing.

The controller was installed using the correct pigtail to connect into the wiring harness junction box.

Sorry I was having trouble logging into my online repair manual.Lets start form the beginning of the circuit.With the brake pedal pushed see if the white coming out of the switch has power?

Also while stepping on the brakes or just do this instead at the underhood fuse box see if the chmsl and veh stop fuse has power across both sides of those fuses while stepping on the brakes?

Brakes problem
1998 Chevy Suburban Four Wheel Drive Automatic

My brake lights do not work I checked fuse, blubs and wires.I replaced brake switch, and still have no brake lights.

do the turn signals work in the rear?

chmsl fuse has 45.3mv on one side and 2.3mv on the other. The veh stop fuse has 2.3mv on both sides.

yes the blinkers work along with the lights. The brakes are the ones that do not light up.

Now go to the brake switch see if the orange wire to the brake light switch has battery voltage to it?Also if the white wire coming out of the switch has battery voltage while stepping on the brakes?

check the white wire going from the brake light switch to the directional switch. if it has power when brakes are applied then the turn signal swit ch is bad. if no power to white wire you need to check for power at the orange wire at the brake light switch. i have been seeing alot of turn signal switches cause no brake lights on this truck. the brake light circuit goes through the turn signal switch then to brake lights

There is no steady voltage on the orange or white wires. The voltage is jumping around in the mv range.

Now go to the underhood fuse by the battery and see if the stop lps fuse has battery voltage on both sides of it?

Electrical problem
1995 Chevy Suburban V8 Automatic

I have no brake lights. I replaced the multi-function switch and the brake light switch. All fuses are good in the truck. What is the problem?

Hello, does the high-mount brake lite work? Did you check the wiring circuit to the brake switch? orange wire is hot going to the brake switch. When the switch is activated, the white wire goes hot. The highmount brake lite isn't wired through the turn switch, but, the lower brake lites are. Anytime you check a fuse, you also have to check for voltage at the fuse.

stop lps fuse had battery voltage on only one side. Checked fuse and it was blown! Replaced fuse and now have brake lights but no third brake light or readout on the trailer brake controller.

high mount lite does not work either

Alright stepping on the brakes does the chmsl fuse in the underhood fuse box have power to both sides of it?

I'd check for voltage at the brake switch.

chmsl fuse was also blown!! Replaced it and now have ALL of my lights!

Thank you!

Make sure your trailer wiring matches your truck that could be blowing the fuses.

The bulbs are fine, the fuse is good, I replaced the brake light switch but still no brake lights. Suggestions?

Does your 3rd (high mount) brake light work?

Also glad I could help you.

No, it's does not come on either.

I have been towing this trailer for several years with no problem, until now.

I will check and see if something may have shorted a wire.

Thanks again and have a great day! Mikel

the light on the trailer brake unit doesn't come as well.

Your welcome glad I could help.

I just had the rear main seal replaced and it returned with the brake lights not working. The shop says it's nothing they did? I first checked the bulbs. They are good. But there is no power to them. Izin check the fuses and they are good. I've been replaced the brake pedal switch. And still no brake lights checked and I have going to the brake pedal switch and from the brake pedal switch when it is depressed. I see no breaks in the wire and I'm not sure where to go from here?I wonder if the shop in replacing that their main seal, where they have to remove the transmission, if a smashed a plug nothing in the process? But it appears to me that the brake wires don't run through the middle of the car where they were working it looks like they run up the side car under the passenger seat.

Are you sure you checked all fuses under the hood and inside the vehicle? Do you have any type of towing connector plugged in by the hitch?