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Brake booster light and buzzer comes on. Level was a little…

Customer Question
brake booster light and...

brake booster light and buzzer comes on

Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed?

Level was a little low,been awhile since its been changed

Mechanic's Assistant: What is the make/model/year of your car?

Gmc w5500 2003

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

Yes, nothing yet trying to get some idea where to start

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

Light turns off after driven a little,some times when brakes are applied you a little pedal kick back then brakes are fine

Submitted: 7 months ago.Category: GMC
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Answered in 1 day by:
10/1/2017
GMC Mechanic: Shawn Few ,
 replied 7 months ago
Shawn Few
Category: GMC
Satisfied Customers: 144
Experience: Lead Tech at F1 Auto Service
Verified

Hey ,how are you
I seen That your post been sitting for a long time without an answer ,I 'm sorry for your long wait without getting an answer till now
I will try to help you on this issue if you have not gotten it resolved yet
Please Let Me Know
Thank You
ASE Certified Technician

Ask Your Own GMC Question
Customer reply replied 7 months ago
Issue not resolved yet!
GMC Mechanic: Shawn Few ,
 replied 7 months ago

hey how are you

sound you have air in lines , change that fluid ,bleed and retest it .

do a master reset after the fluid and the bleed using below procedure

MASTER RESET

1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .

do not worry no spark will happen since we took power source out of the loop by taking both cables off, by touching them we are taking all residual power off the modules to reset them as if we using factory scanner .

2- Hold cables Together for 60 secs ,then let go

3- Wait 30 minutes

4- Make sure all doors are closed

5- Reconnect battery Cables

6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)

7- Enter the vehicle and attempt to start

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GMC Mechanic: Shawn Few ,
 replied 7 months ago

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Shawn Few
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Shawn Few
Category: GMC
Satisfied Customers: 144
144 Satisfied Customers
Experience: Lead Tech at F1 Auto Service

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