2015 GMC Sierra 1500 brakes problems: brakes are stiff

Brakes Are Stiff

2015 GMC Sierra 1500

This problem may be covered under warranty. Ask your GMC dealer.


pretty bad
Typical Repair Cost:
Average Mileage:
53,000 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. replace booster, master cylinder & vaccuum pump (2 reports)
  2. not sure (1 reports)
  3. replace the vacuum pump (1 reports)
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2015 GMC Sierra 1500 brakes problems

brakes problem

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2015 GMC Sierra 1500 Owner Comments

problem #4

Feb 142019

Sierra 1500 5.3L V8

  • Automatic transmission
  • 23,612 miles


Bought the truck new and have had several small annoying problems with it until this one. When you are in a parking situation or really slow traffic where you need to apply the brakes 3 or 3 times close together, the brake pedal becomes stiff like a board and the truck is hard to stop!! It can cause you to bump the vehicle ahead of you. There is a service bulletin out on this and its become pretty common on the GM full size trucks 2014 and up. Dealer had to replace brake booster, hoses and whatever else. This should be a safety recall!!!! and if it happens to you off warranty, it's a costly repair!!

- Antimo G., montreal, QC, Canada

problem #3

Nov 052018

Sierra 1500 Denali 5.3L V8

  • Automatic transmission
  • 49,710 miles

Brakes on my 2015 Sierra GMC Denali were stiff. The vehicle was very hard to stop at low speed, such as stop and go traffic and parking lots. Near rear end collision. Had to replace the vacuum pump at a cost of $500. Very dangerous!!!

- Janet K., Chatham, ON, Canada

problem #2

Nov 202018

Sierra 1500 Denali 5.3L

  • Automatic transmission
  • 46,482 miles

On Nov 20 2018, My family and I was travel to Kissimmee FL for the Thanksgiving Holidays in my 2015 GMC 1500 Sierra. as we exit the turnpike my brake pedal got extremely hard and didn't stop. I had to drive on the side of the road to get out of traffic. This was terrifying and very unsafe, finally coming to a stop. I made it a GMC dealer hoping to get the brakes repaired. Being Thanksgiving it didn't happen, they were busy. So I got in at a Tire Kingdom in Kissimmee. They took me right in and they made the repairs. The power brake booster, brake master cylinder, power brake booster vacuum pump all had to be replaced. $1300.00 later I was out of the shop with good brakes.

My GMC Sierra 1500 only has 46000 miles. This type of brake problem could have been fatal for me and my family. All parts had to be replaced with GM OEM parts I don't trust GM parts anymore. I'm still driving the truck, but I am very careful with it. I always drove GMC pickups, but now I'm thinking about RAM.

- Terry P., Perry, FL, US

problem #1

Oct 232018

Sierra 1500 SLT

  • Automatic transmission
  • 92,000 miles

Makes me feel like I am not sure the brakes are holding.

- sommert, Greenville, US

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