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Old 09-12-2015, 09:03 PM   #1
eblanchette
 
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Warning to those who want to track their cars with stock fluid.

someone who isnt me tracked his car with stock brake fluid, and to his surprise he completely lost braking power. pedal went straight to the floor, and unless pumped 2-3 times, no brakes at all.

the car had z28 brake ducts installed. and stock everything on the standard goodyears.

whatever you do, use racing fluid or AT LEAST DOT4.

Just general advice for people who track on hot climates.

after the brake loss, bleeding the 4 calipers with racing fluid fixed the problem. looooots of air in the lines... who knows why?(like science pro explanation so it does not happen again)

good day people!
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Old 09-13-2015, 05:48 AM   #2
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One step further, bleed immediatly before track days for best results. Keeping air out of the lines is an ongoing process when brakes are heat cycled at the track.
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Old 09-13-2015, 03:32 PM   #3
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I understand upgrading to dot 4 for better performance but how does air get into the brake lines? Im thinking the brake system is a high pressure sealed system and once the air is out that is it? I have never tracked my car so I have no experience there but i am curious how air gets in there?
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Old 09-13-2015, 04:24 PM   #4
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the fluid absorbs moisture over time and once the fluid boils the water turns to gas, which I suppose could be considered air. Once it cools it would recondense into liquid though.
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Old 09-13-2015, 04:27 PM   #5
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Quote:
Originally Posted by Windycity View Post
I understand upgrading to dot 4 for better performance but how does air get into the brake lines? Im thinking the brake system is a high pressure sealed system and once the air is out that is it? I have never tracked my car so I have no experience there but i am curious how air gets in there?
Overheating the fluid will cause it to boil, separating the some of fluid (incompressible) to vapor (compressible). Even the the system is sealed, it will lose the ability to transmit force hydraulically.

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Old 09-13-2015, 04:58 PM   #6
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Quote:
Originally Posted by clashley1976 View Post
Overheating the fluid will cause it to boil, separating the some of fluid (incompressible) to vapor (compressible). Even the the system is sealed, it will lose the ability to transmit force hydraulically.

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Is that some how related to my clutch pedal hanging up on the floor boards at the drag strip today?
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Old 09-13-2015, 05:19 PM   #7
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Is that some how related to my clutch pedal hanging up on the floor boards at the drag strip today?
not likely, did the pedal return when the rpms came back down? How much have you raced it or ran it hard?
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Old 09-13-2015, 06:00 PM   #8
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Mine certainly never came back until I bled the calipers


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Old 09-13-2015, 06:16 PM   #9
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yes as rpm came back down it came up, not too much racing third time and first time with drag radials on it launched real good maybe I mashed the clutch pedal harder than I normally have as it was feeling like my best run ever lol
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Old 09-13-2015, 06:22 PM   #10
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Exclamation playing it safe

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Mine certainly never came back until I bled the calipers
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WOW! that could have been real bad,
sounds like I am going to change the fluids if it will avoid that,
no brakes =
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Old 09-13-2015, 06:31 PM   #11
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use Motul 600 or equivalent or Castrol SRF ($$) and enjoy the higher boiling temps and nice firm brake pedal. Motul 600 is a great fluid for sure and is always consistent. A Motive power bleeder helps the procedure go smoothly and with little fuss.
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Old 09-13-2015, 10:06 PM   #12
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Ok that make sense! I just purchased a 2015 1le and was wondering if you need to change the hose the connects the brake line to the calipers or did chevy put braided hoses on from the factory? Havent taken a wheel off yet to see if they are rubber....
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Old 09-14-2015, 07:04 AM   #13
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No the 1Le has rubber lines upgrade them!!
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Old 09-14-2015, 10:29 AM   #14
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Rubber lines will be fine. You certainly don't NEED to change them. It's not like they will rupture or anything like that. Stainless lines will provide some extra abrasion resistance and better pedal feel though. Just make sure you spend the money on good ones, do not cheap out on stainless brake lines.

You should flush the brake fluid though before a track day with a good fluid like Motul RBF600. Me personally would not spend the money on SRF, since you need to flush it before each event it would get pretty pricey.
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