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Discussion Starter · #1 ·
Many of you have the annoying brake pedal squeek.
Fellow members have reported that Valvoline Full Synthetic brake fluid fixed the noise.

GM also released a new Brake Fluid a few months ago.
I was waiting until I tried it to give my opinion.

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The new fluid has significant improvements in lubricity to eliminate previously known issues with master cylinder squeak/noise.
The new DOT 3 brake fluid — GM P/N 19299818 (U.S.) and GM P/N 19299819 (Canada)
Always use the new DOT 3 brake fluid when refilling or servicing the brake system. If another type of DOT 3 brake fluid (including the GM DOT 3 Delco Supreme II) is used to refill the master cylinder, it may cause a master cylinder squeak noise. If the wrong DOT 3 brake fluid is used, remove as much of the old brake fluid from the master cylinder as possible and refill with the new DOT 3 brake fluid. Depress and release the brake pedal five times to allow the new fluid to enter the system.
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Now that I hit the 5 yr mark/82,000 - I went ahead and bled the brakes
30 min job at most.

MedicRxDoc- posted in another thread the bleed sequence.

"The online manual has RR, LF, LR, then RF"

Remove the rubber caps from the bleeder screws.
I attach a small rubber hose to the bleeder screw- which drains into a bottle.


The procedure is straightforward.
Remove SOME fluid from the reservoir- refill with new fluid.
My wife was my assistant.
Her job was to pump brake pedal 3 times- on the 3rd- she holds down the pedal, lets me know- and I open the bleeder screw- she tells me the brake pedal is dropping- and I then close.
We repeat this several times at each wheel- until you see a change in the fluid color.
ALWAYS make sure there is plenty of fluid in the reservoir.
you DO NOT want to suck in air at the reservoir.

The fluid had a greenish tint to it.

The result.
Brake pedal has a 'tighter' feel.
Brake pedal squeek is gone.




Sorry I dont have more detailed pics-
Since brake fluid can damage auto paint- theres some shots I couldnt do without spilling/splashing fluid.


Nipples have rubber caps over them.
Remove caps to expose. Front/Rear shown.






Turkey baster with a hose--
Stick the hose down the tube of the reservoir to remove some fluid




New brake fluid is clear--- like water.
What comes out

 

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Nice post :thumb:
 

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Rrrrrrrrrrrrrrroberto rules... always great posts and pics... :rock:
 

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Discussion Starter · #4 ·
Ill add---

from the bleeder nipple- I attached a hose into the bottle.
the end of the hose is submerged in brake fluid I sucked out of reservoir.
 

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Engineer said:
I did flush the brake fluid and used the brake fluid mentioned above, the sound still available :mad:
I did the the fluid swap.... not once..... not twice..... but thrice ;)and still squeaks. If I got the motivation i'll probably do the other method of lubing the plunger under the dash. More of an annoyance than a safety or reliability issue.
 

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:thumb: on your signature, Carbon Black!
 

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GeoHawk said:
:thumb: on your signature, Carbon Black!

Ahhh yes that's how I roll. :notworthy:
 

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Discussion Starter · #9 ·
Engineer said:
I did flush the brake fluid and used the brake fluid mentioned above, the sound still available :mad:

Hmmmm.
Sorry to hear.
It was successful for me.
 

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Brake booster probably need to be changed
 

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FORUM GM said:
Brake booster probably need to be changed

X2 ANOTHER common failure
 
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