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Old 02-02-2012, 12:31 PM   #1
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Default How are car's hydraulic systems bled at the factory?

Stuff like brakes and clutch. Also radiator burp.

This is a tedious process at home so i assume manufacturers have a quick way to do this?
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Old 02-02-2012, 12:36 PM   #2
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Not sure if serious. Its easier than your an00s
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Old 02-02-2012, 12:41 PM   #3
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That's a very good point. They can't have two technicians sitting around bleeding all that crap... probably some sort of vacuum system. Possible hooked up to the MASSIVE compressed air system all shops and assembly lines have.
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Old 02-02-2012, 12:46 PM   #4
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So you guys are talking about doing it alone only then?
Because with 2 people it takes all of 5 minutes to bleed the clutch/brakes.
And burping the cooling system doesn't even require 2 people.
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Old 02-02-2012, 12:47 PM   #5
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Reverse "bleed" where they fill from the lowest point to the top. I do it on my cars when a line goes dry, it's awesome and requires no pumping of pedals.
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Old 02-02-2012, 01:00 PM   #6
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Originally Posted by hustler View Post
Reverse "bleed" where they fill from the lowest point to the top. I do it on my cars when a line goes dry, it's awesome and requires no pumping of pedals.
That should work for brakes and clutch, but not so much for coolant, right? Aren't there a few high spots in hoses and in the head that would hold bubbles until the car runs the first time, then they would get pumped to the top of the radiator? I'm sure it's pretty easy, however they do it, I've just never thought about it.
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Old 02-02-2012, 01:12 PM   #7
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Originally Posted by skidude View Post
That should work for brakes and clutch, but not so much for coolant, right? Aren't there a few high spots in hoses and in the head that would hold bubbles until the car runs the first time, then they would get pumped to the top of the radiator? I'm sure it's pretty easy, however they do it, I've just never thought about it.
They low-pressure vacuum fill with water. OEMs don't care about a small amount of air in the system because they build cars to cruise at 2000rpm. I took a tour once at a Hyundai factory in TN and remember a few of these things, but that was almost a decade ago.
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Old 02-02-2012, 01:32 PM   #8
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vacuum filling could work better, yes. And a little air will make its way out after a couple driving cycles anyway.

I would love to tour a car factory. Too bad nobody makes any cars in Maine.
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