Trying to Perform a Brake Fluid Flush - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 8 (permalink) Old 05-06-2012, 01:39 PM Thread Starter
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Trying to Perform a Brake Fluid Flush

any one familiar with the mity vac brake bleeder/flush system

i use this at work so i know how to use it and just performed a complete brake flush on the 91 toyota 4x4 thismornig before i attemptem my 07 cobalt 2.4l. with 47,000 miles. when i crack open the bleeder valve starting with pass rear (farthest from master cylinder) i get barley any fluid out more bubbles than anything, left it on for 20 minutes and cant get but a few ounces out tryed the same with drivers rear and same thing. i havent touched the front yet. any reason why my calipers would not be letting brake fluid out of the bleeders after there cracked open. i completley flush my extended cab toyota in 20 minutes time. thanks for any help guys. possibly the pin hole on my bleeder valve is rusted shut. i live in redding ca so not like its moist humid weather to build corrosion
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post #2 of 8 (permalink) Old 05-06-2012, 01:52 PM
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Do you have ABS brakes?

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post #3 of 8 (permalink) Old 05-06-2012, 06:51 PM Thread Starter
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ya i have abs brakes, so does my gf 06 corolla that i succesfully did today just fine as well as all the cars i do at work. i work at a toyota dealership and attempted to do my cobalt just the way ive always dont any other cars at work. im wondering if my cobalt has some kinda valve that also has to be loosened but shoulldnt as i can pressure bleed them just fine (holding down the brake pedal and loosening bleeder valve) thats just kinda the old way of flushing the brake system
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post #4 of 8 (permalink) Old 05-06-2012, 07:56 PM
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Did you try running the engine to see if ABS would center its piston.

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post #5 of 8 (permalink) Old 05-06-2012, 08:38 PM Thread Starter
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no didnt think about running the engine i will give that a shot tomorrow after work. i only tryed the rear and couldnt get fluid out. abs is front and rear im assuming?
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post #6 of 8 (permalink) Old 05-07-2012, 09:00 AM Thread Starter
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im gonna have to do it the old school way for the rear i found out thismorning the rear dics brakes take 80-125psi of sucking power to get the abs valve to open in order to get the fluid to flow freely out the bleeder valve or hooking up a scan tool and communicating with the abs and having the computer open the abs valves one at at time sound like a huge pita. i will just do the slow process of pumping and hold the pedal. the fronts can be bled normally the chevy tech said its only the rears that require a scantool or special bleeder machine other than the one i am using. Thanks guys
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post #7 of 8 (permalink) Old 05-07-2012, 09:14 AM
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Do both, hook up the pump then press the pedal with engine running of course.

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post #8 of 8 (permalink) Old 05-07-2012, 03:59 PM
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Quote:
Originally Posted by Coby7 View Post
Do both, hook up the pump then press the pedal with engine running of course.
^^this. I use a brake bleeder too but it goes much faster if you pump the brake pedal a few times per wheel as well.

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