2015 Chevy Tahoe brakes not working properly in reverse

I'm having the exact same brake issue posted on this question linked below, except I have a 2015 Chevy Tahoe. It started about 3 weeks ago and happens about half the time I back in or out of a parking spot. My vehicle is currently at the Chevy dealership and they can't replicate the problem or find anything wrong.

https://www.yourmechanic.com/question/brakes-don-t-work-in-reverse-how-does-this-happen

My car has 39500 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. Check the linings on the pads and the rotors and see how they are. If there is a lot of material on the front brake pads, then the front is good but when braking while driving backwards, the rear brakes do most of the stopping. Check the rear brakes and see if they are working properly. If you have drum brakes on the rear, the springs may be worn and you would need to replace the springs with a brake spring kit. If you have calipers on the rear check the slider pins and see if they have lubrication. Some times the lubrication on the rear brakes tend to dry up and make the calipers stick. When this happens the inside brake pad will have less material than the outside pad. If the pads are low in friction material, I suggest replacing the brake pads or shoes. If you need further assistance with your brakes, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The reason you are experiencing this problem in reverse, and mostly on the incline, is because you are using both the gas and the brake pedal at the same time to maneuver your vehicle. This causes a low vacuum, which in turn makes it harder to depress the gas pedal.
If you have a stiff brake pedal and the vehicle has a vacuum pump or hydraulic brake booster, some common issues could be a missing serpentine belt, a failing electric pump, or low power steering fluid.
The most common cause of failure is a leak in the brake lines. The brake fluid will slowly drain out, until there isn`t enough left to transmit the pressure from the pedal to the tires. The brakes can also fail when the discs or drums wear out, so they can no longer put enough friction on the wheels to stop them.
A brake pedal defect has led GM to recall certain 2015-2016 Chevrolet Silverado 2500, 3500, 1500 Crew Cab Special Service, Tahoe Police Pursuit/Special Service, GMC Sierra 2500 and 3500 vehicles. The brake pedal pivot nut may loosen, causing the brake pedal to be loose or inoperative.
Drum brakes generate consistent braking force whether the vehicle travels forward or backward. This is because drum brakes generate the same braking force in either direction.
With the car turned off, pump the brake pedal four or five times until you get a hard brake pedal. Continue to hold the brake pedal down with moderate pressure and start the vehicle. The brake pedal should drop. If this brake pedal remains hard, there is a problem with the brake booster, such as a ripped diaphragm.
Note: Auto Hold remembers the last on or off setting when you start your vehicle. Note: When in reverse (R), Auto Hold does not function.
When reversing, the towing vehicle pushes in the draw shaft of the overrun device. The brake shoes (1,2) are pressed against the brake drum via brake linkage, Bowden cable and expander clutch (3). The brake drum turns backwards, taking the trailing shoe (1) with it.
Note: Auto Hold remembers the last on or off setting when you start your vehicle. Note: When in reverse (R), Auto Hold does not function.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

2015 Chevy Tahoe brakes not working properly in reverse
ANSWER : Hi there. Check the linings on the pads and the rotors and see how they are. If there is a lot of material on the front brake pads, then the front is good but when braking while driving backwards, the rear brakes do most of the stopping. Check the rear brakes and see if they are working properly. If you have drum brakes on the rear, the springs may be worn and you would need to replace the springs with a brake spring kit. If you have calipers on the rear check the slider pins and see if they have lubrication. Some times the lubrication on the rear brakes tend to dry up and make the calipers stick. When this happens the inside brake pad will have less material than the outside pad. If the pads are low in friction material, I suggest replacing the brake pads or shoes. If you need further assistance with your brakes, then seek out a professional, such as one from Your Mechanic, to help you.

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

Low brake pedal and anti-lock brakes are not kicking in.
ANSWER : The brake pedal is working to stop the vehicle, but there may be air in the controller unit causing the ABS brakes to not function. I recommend bleeding the brake system from the farthest location from the master cylinder to the master cylinder including the ABS unit. If the brakes are still spongy after a full bleed, then the controller will need to be replaced. If you need further assistance with your brake pedal being spongy, then seek out a professional, such as one from Your Mechanic, to help you.

Supportive bar attached to brake pedal interrupts proper braking process
ANSWER : It’s possible to have someone alter the brake pedal or adapt a brake pedal from a different vehicle. You may call around to some customization shops to see if anyone is interested in taking on the project. But first, I would try reaching out to the selling dealer with your concern – especially since it is a new model. Good luck.

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

Okay so when I turn my lights on at night my brake lights do not work, when I don’t have my lights on they work fine.
ANSWER : Hi there. Based on your inquiry, it’s highly probable that you have a damaged light switch or some electrical fault inside the turn signal relay. However, it’s also possible that the brake switch above the brake pedal could also be the source of your problem. Due to the fact that multiple electrical components might be causing this issue, it’s a smart idea to first have a professional mobile mechanic complete a brake lights are not working inspection, so they can determine what’s causing all of these issues and recommend the right repairs.

I replaced the brake light switch. Gear lever unlocked because it had locked. Now the brakes feel hard.
ANSWER : Hi, thanks for writing in. You need to check the brake switch install adjustment. You may have the switch adjusted too tight and it is holding the the brake pedal partly down. This will cause the brake master cylinder to not release the brakes when you let off the pedal. Readjust the switch away from the pedal until you feel some free play again in the pedal. This should fix the problem. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Brake lights on trunk not working
ANSWER : For some reason, when consulting the wiring diagram, I don’t see a trunk mounted brake light listed. I only see the high mount (one in the rear window) listed. Regardless, if the trunk bulb is not working with a new bulb, there is a problem with the circuit. Check for both power and ground at the bulb. Once you’ve determined which is lacking, you’ll have to trace the circuit to determine where the problem lies. Since you said all of the other brake lights work, the cruise control is likely unrelated. Electrical diagnosis can be difficult, so I suggest you have a trained professional tackle the problem with your brake lights for you.