Could you do me a favour?

[Katie989]

It would be super awesome if yous could do me a huge favour! The next time you go to start your truck after it has been sitting for 5 plus hours (like in the morning after it has been sitting all night). Before starting the engine could you try pressing the brake peddle and report back with the results. Mine is hard as rock first push (not that I can push it lol). Im trying to figure out if it’s normal or not. 

 

I recently had the hard brake peddle while reversing into a parking spot issue that’s been posted on the forums a couple times. Dealership replaced the brake booster. But I think something is still not right with the brakes. Hard peddle after the truck sits for 5 hours and an inconsistent feeling of the peddle getting higher and harder after repetitive use sometimes makes me think this. But I’m also a little uneasy with the truck now, I don’t really trust it to stop. Dealership doesn’t think anything is wrong or just doesn’t believe me. Trying to figure out what to do. Truck is a 2015 Silverado crew cab V8 btw. 

[PMurray]

It would be super awesome if yous could do me a huge favour! The next time you go to start your truck after it has been sitting for 5 plus hours (like in the morning after it has been sitting all night). Before starting the engine could you try pressing the brake peddle and report back with the results. Mine is hard as rock first push (not that I can push it lol). Im trying to figure out if it’s normal or not. 
 
I recently had the hard brake peddle while reversing into a parking spot issue that’s been posted on the forums a couple times. Dealership replaced the brake booster. But I think something is still not right with the brakes. Hard peddle after the truck sits for 5 hours and an inconsistent feeling of the peddle getting higher and harder after repetitive use sometimes makes me think this. But I’m also a little uneasy with the truck now, I don’t really trust it to stop. Dealership doesn’t think anything is wrong or just doesn’t believe me. Trying to figure out what to do. Truck is a 2015 Silverado crew cab V8 btw. 

We all(?) depress the brake when starting and putting vehicle in gear. Rock hard pedal is not normal. If not fixed it's lemon law or recall justification, inho.

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[rkj__]

The brake pedal on my 2018 Sierra is never rock hard.

[Centex14]

Mine isn’t hard at a 117k mikes but I’ve experienced the hard pedal once in a drive through. My chargers brake pedal gets hard if it sits for a few days. It’s definitely vacuum related. Think I’m going to swap to an electric pump instead of the mechanical.


2014 z71 LTZ
Volant Intake
Borla Exhaust
Diablo
Bilstein 5100
Rough Country Level

[bagger97]

There is a TSB on the vacuum pump leaking oil into the brake booster. Warranty replacement of all the parts.

[Sierra706]

Mine will get hard after repeated presses when the truck is off but is soft first press. Never hard while running


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[Katie989]

18 hours ago, PMurray said:

We all(?) depress the brake when starting and putting vehicle in gear. Rock hard pedal is not normal. If not fixed it's lemon law or recall justification, inho.

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I only press the brake when putting the truck in gear, not when starting. But I might change that after this. I agree, it should be a recall. And from what I have been researching I don’t know why it isn’t!! I’ve reported the issue to Transport Canada’s Defect Investigations and Recalls Devision. 

[Katie989]

2 hours ago, bagger97 said:

There is a TSB on the vacuum pump leaking oil into the brake booster. Warranty replacement of all the parts.

Yeah I seen it. I printed it off and showed the service advisor when I first took the truck in. He read it, said it seems like what I was describing and handed it back to me saying they usually check service bulletins. They replaced the brake booster so if there was oil hopefully they would have seen it. I’m 6 months out of warranty so I’m stuck paying for it myself. 

[Katie989]

50 minutes ago, Bushleaguechew said:

Mine will get hard after repeated presses when the truck is off but is soft first press. Never hard while running


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Thanks! 

Do you have multiple brake peddle presses after the truck has been sitting for 5 plus hours or multiple presses right after the truck has been shut off? 

I have 6 presses of the brake peddle right after the truck is shut off but if I shut the truck off and wait 5 hours the first press is hard.

I guess what I’m trying to figure out is if that stored vaccume that you are releasing by pushing the brake with the truck off, is it in a closed / sealed system if nothing is broken? Or is it normal for it to dissipate over 5 hours? Or should it hold its vaccume for a certain amount of time? 

Thankfully, I haven’t had the rock hard peddle with the truck on since they replaced the booster but the peddle seems to get higher and harder when I press it frequently and this combined with the loss of stored vaccume when the truck is parked makes me think something is still wrong 

[Sierra706]

Thanks! 
Do you have multiple brake peddle presses after the truck has been sitting for 5 plus hours or multiple presses right after the truck has been shut off? 
I have 6 presses of the brake peddle right after the truck is shut off but if I shut the truck off and wait 5 hours the first press is hard.
I guess what I’m trying to figure out is if that stored vaccume that you are releasing by pushing the brake with the truck off, is it in a closed / sealed system if nothing is broken? Or is it normal for it to dissipate over 5 hours? Or should it hold its vaccume for a certain amount of time? 
Thankfully, I haven’t had the rock hard peddle with the truck on since they replaced the booster but the peddle seems to get higher and harder when I press it frequently and this combined with the loss of stored vaccume when the truck is parked makes me think something is still wrong 

I’ll check tonight. Even when running repeated pressing can blow through vacuum faster than it can be replenished


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[2018GMC]

.

[Loco-diablo]

We all(?) depress the brake when starting and putting vehicle in gear. Rock hard pedal is not normal. If not fixed it's lemon law or recall justification, inho.

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It’s a 2015. Way beyond lemon law in most states.


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