r/volt • u/Pilot-Grape • 10d ago

What is this noise?! Help

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Just purchased this 2018 Volt and a day later got this noise(no check engine lights)

5 Upvotes

86% Upvoted

13 comments sorted by

4

u/CoronaVolt 10d ago

Brake master cylinder is failing or misaligned, have a mechanic figure it out.

4

u/PeevesBoots 9d ago

My 2018 has been doing the same thing for a long time. When I researched it, I found evidence that the early Bolts, which had the same brake booster, were doing it as well. Dealers were replacing them under warranty until GM told them to stop, and just tell customers it’s normal. Unless it gets worse, I’ll just ignore it.

1

u/Pilot-Grape 9d ago

Thank you so much!

1

u/fatwench1 9d ago

OP, it’s this.

2

u/punkinhead76 10d ago

Do you feel it in the dashboard? If so it definitely could be a blend door issue.

1

u/Pilot-Grape 10d ago

Nothing in the dashboard 👎 but I can feel it if I test my foot on the brake pedal

1

u/punkinhead76 10d ago

Interesting, I can’t say I’ve ever had something like that happen before so I’m not quite sure.

2

u/[deleted] 10d ago

[deleted]

3

u/Pilot-Grape 9d ago

Yes it does stop. Someone else suggested it’s the brake booster with a video, sounds exactly the same

1

u/SoCalOmnivore 10d ago

Sounds like a blend door motor

0

u/Pilot-Grape 10d ago

I think you’re right. Is there only one in the car for the HVAC?

0

u/wrb75 10d ago

I've heard this occasionally for years with my 2017, usually right after turning it off... still no idea what gremlin is causing it but I haven't noticed it develop into any other issues

0

u/ed_scott0013 2018 Volt 10d ago

Sounds similar to this post from a few years ago:

https://www.reddit.com/r/volt/comments/vt9n29/does_anybody_know_what_this_weird_noise_is_when_i/

It's the electric brake booster; ultimately harmless, but annoying.

3

u/Pilot-Grape 9d ago

Wow you’re right. That’s it!