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Brake Oil Bleeding

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Old Sep 15, 2009 | 08:25 AM
  #1  
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Brake Oil Bleeding

Hello,

I was planning on doing a SS line install and changing the brake oil on my X. I have been doing some reading on the following excellent link for a How-To.

http://www.joe250.com/cars/evo8/brak...ebleeding.html

However, I just realized, there wasn't much detail on how to drain the existing fluid in the first place. Is it as simple as the following?

1) Opening all nipples, bleeding/draining as much as possible by pumping the brakes.
2) Replace the lines with the SS lines.
3) Refill the reservoir with the new fluid
4) Then follow the directions in the above posted article.
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Old Sep 15, 2009 | 08:33 AM
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Dude, dont pump the brakes with the bleeders open, you will be there all day that way. Replace the lines, you will lose plenty of fluid. Fill the resevoir, BTW dont let it get empty while you are changing lines. Add fluid when you have lines replaced, bleed in the proper order, you will likely go thru 1.5-2 bottles of fluid --fyi. When your done you will have fresh fluid in all lines and calipers. I just did this myself 2 wks ago--trust me.
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Old Sep 15, 2009 | 08:40 AM
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Make sure you make a bottle with some tubing to put over the nipples into the bottle. You do NOT want brake fluid on those pretty brembos. Or you will deal with the consequences of the clear chipping / peeling.
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Old Sep 15, 2009 | 08:44 AM
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Originally Posted by meckert
Dude, dont pump the brakes with the bleeders open, you will be there all day that way. Replace the lines, you will lose plenty of fluid. Fill the resevoir, BTW dont let it get empty while you are changing lines. Add fluid when you have lines replaced, bleed in the proper order, you will likely go thru 1.5-2 bottles of fluid --fyi. When your done you will have fresh fluid in all lines and calipers. I just did this myself 2 wks ago--trust me.
Does it matter that I am moving from the Stock brake oil to Motul RBF 600? Dont want the two oils to mix, or does it really not matter if there is still a little bit of the stock oil in there?

This is what I understand from what you said:

1) open the cap on brake oil reservoir.
2) open the stock rubber brake line.
3) let as much fluid flow out as possible before putting on the new SS line.
4) Then, refill the reservoir with the new fluid and follow instructions as per the article I posted earlier.

In step (4), should I just keep filling in the new oil as the old oil level is going down, in order to prevent too much air, or should I just let it all drain before I start pouring in the new fluid?

Thanks in advance.
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Old Sep 15, 2009 | 08:45 AM
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Originally Posted by migs647
Make sure you make a bottle with some tubing to put over the nipples into the bottle. You do NOT want brake fluid on those pretty brembos. Or you will deal with the consequences of the clear chipping / peeling.
I have been warned, thank you sir!
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Old Sep 15, 2009 | 02:18 PM
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If you bleed it properly, all the old stock fluid will get flushed out of the system, leaving only the new fluid in the system. I'm not sure on the order to bleed either. It should be in the service manual. By order, I mean which corners do you bleed first. It's VERY time consuming, but you have to patiently bleed the brakes to get all the old fluid out and new fluid in.

In step 4, also make sure you always keep the reservoir filled. Don't let it go empty or you will introduce air into the system and have to start from scratch again. This is also a two-person job if you do it manually with the pumping method. I'd advise getting someone who has done it before to help you since you seem to be unsure about some of the steps required.
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Old Sep 15, 2009 | 02:26 PM
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Of utmost importance...DO NOT LET ANY AIR INTO THE BRAKE LINES. That could be catastrophic. If you're not 100% sure you can do it right, please take it to a shop. Bring your fluid with you and ask them to bleed the brakes and put in the new fluid.
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Old Sep 15, 2009 | 09:00 PM
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Originally Posted by LaXGSR
If you bleed it properly, all the old stock fluid will get flushed out of the system, leaving only the new fluid in the system. I'm not sure on the order to bleed either. It should be in the service manual. By order, I mean which corners do you bleed first. It's VERY time consuming, but you have to patiently bleed the brakes to get all the old fluid out and new fluid in.

In step 4, also make sure you always keep the reservoir filled. Don't let it go empty or you will introduce air into the system and have to start from scratch again. This is also a two-person job if you do it manually with the pumping method. I'd advise getting someone who has done it before to help you since you seem to be unsure about some of the steps required.
Thank you, I do plan on doing it with my dad or a friend of mine. I definitely wanna get this right, and hence all the questions.
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Old Sep 15, 2009 | 09:08 PM
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Originally Posted by adambl03
Of utmost importance...DO NOT LET ANY AIR INTO THE BRAKE LINES. That could be catastrophic.
I definitely have no intent of letting any air in either. I am confident about the bleeding to get rid of air. Where I am drowned in a cloud of doubt is the step in which we start adding the new oil. How can we ensure that the old and new oild do not get completely mixed up? In my mind, I see two liquids being added to the same reservoir, so I will think that they will naturally mix. This is where I have all my questions. I wish that article I posted had a few more details.

If you're not 100% sure you can do it right, please take it to a shop. Bring your fluid with you and ask them to bleed the brakes and put in the new fluid.
But where's the fun in that? . Seriously, I obviously dont wanna kill myself, but I also wanna learn to do it. Rest assured, I will not attempt it unless I have the steps jotted down 100% of the way.Until then, they'll just be sitting in my garage, no big deal. I'll take my time, thank you very much for the warning and advice though, I know you only have the best intentions in mind when yoiu say that .
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Old Sep 15, 2009 | 09:45 PM
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BTW, the bleed order is 4, 1, 3, 2... right rear, left front, left rear, right front

And I've read you need to have the car running to pump ABS... not sure if that's true but I did anyways on my VIII.

Last edited by migs647; Sep 16, 2009 at 09:07 AM.
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Old Sep 15, 2009 | 11:55 PM
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just follow the instructions and you will be fine. i recently just replaced my oem lines with ss lines and motul rbf 600.
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Old Sep 16, 2009 | 03:50 AM
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BTW man, it's not OIL it is fluid. And if you have never bled brakes before you need to find a general how-to for BRAKE FLUID BLEEDING or BLEEDING BRAKES, it sounds like you may still be a little confused about the sequence of events that need to take place to force the old FLUID out of the system.
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Old Sep 16, 2009 | 03:56 AM
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one more thing, the calipers are 2 part, you need to bleed outside then inside following the order given above.
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Old Sep 16, 2009 | 06:30 AM
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I highly recommend getting a power bleeder and saving yourself the headache of having to do the two-man brake pumping routine.
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Old Sep 16, 2009 | 07:57 AM
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Originally Posted by meckert
one more thing, the calipers are 2 part, you need to bleed outside then inside following the order given above.
The article I posted in my first post actually has the order in it with a schematic. I intend on following it, unless someone's gonna tell me it has changed for the X.
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