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What does it mean when my 2001 GMC Sierra v8, engine not…

Customer Question
What does it mean...

What does it mean when my 2001 GMC Sierra v8 , engine not running but when I step on brakes it makes a mushy noise

Mechanic's Assistant: How many miles are on the car? Are these the orignial brakes?

Over 100 thousand and don't know if original bought used

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Yes I am but not started yet because I don't know where to begin

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I thought I was connected

Submitted: 1 month ago.Category: GMC
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Answered in 5 minutes by:
3/13/2018
GMC Mechanic: Gary, ASE Certified Technician replied 1 month ago
Gary
Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 17,777
Experience: GCM master tech over 25 years
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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GMC Mechanic: Gary, ASE Certified Technician replied 1 month ago

the odds are the brake vacuum booster is bad causing this noise and if the booster is bad enough it will create a vacuum leak to make the engine run bad

if you have any questions please ask

please do not forget to rate me here at Justanswer

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Gary
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Satisfied Customers: 17,777
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