Brake problems

[duckcommander]

My 2018 GMC Sierra doesn’t stop as good I think it should. My 15 Silverado stoped better.  I’ve tried better pads didn’t help. I installed power stop kit on all 4 corners and no improvement. I had it to the dealership they just blew me off. I’ve checked the vacuum pump output lowest it falls in 9 inches of vacuum. My next thing is do any of the techs on here know what the brake psi output is supposed to be. 

[steelerdude15]

Have you had the brake booster recall completed?

 

Here is a link to GM’s website to check for recalls: https://experience.gm.com/ownercenter/recalls

[CamGTP]

I'm sure you could test all this and be pretty accurate.

 

I did a little looking and found somewhere that said the stopping distance at around 60mph was in the low 130's for feet distance. You could find a rural area or dead end road to do this on. Mark the ground where you start to brake with a cone or something and measure out to 120, 130 and 140 feet, slam on the brakes and see where you land. If you are within the 120-130ish foot range, it's stopping as it should.

 

Maybe double check those numbers with Motortrend, Edmunds etc etc to see what they tested at.

[silveradosid]

depending on the system most hydraulic brake systems work between 1200 to 1500 psi

[duckcommander]

There are no recalls for my truck. When I was first checking the vacuum I also looked at the brake pressure and it was 2500 to 3000 psi the first couple of pumps. I have not been able to it to that level again and it never goes above 1500 on a very hard stop.