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Discussion Starter · #1 ·
I'm planning on replacing my master cylinder because my brakes feel fairly mushy even after I replaced the rotors, pads and brake lines. I looked for some help on this but didn't find anything that covers removing and replacing the master cylinder.<p>My questions are:<br>1. Do I need to drain the brake fluid before I pull the MC?<br>2. Should I also replace the brake booster check valve at the same time?<br>3. If I flush the entire brake fluid with new, how much fluid will I need?<br>4. Is there anything else in the system that I need to or should replace or service while I'm "at it?" <p>I do have a power bleeder. <p>Thanks in advance for any info.<br>
 

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Re: Master Cylinder Replacement (IRoll4me)

hi;<p>1. yes, start from the bottom up. everything leaks down, right?<p>2. yes good move, check valve replacement.<p>3. 2 quarts, have three on hand. flush, flush...........<p>4. how does it look? anything rusty, corroded, split (rubber stuff)?<p>power bleeding is the way to go. i use the Motive one. they are good, to very good. better is, well, better. there are a lot of good ones out there. they all make the job better, and, easier.<p>good luck. sounds like you are planning a very good job for the car. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>
 

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Discussion Starter · #3 ·
Re: Master Cylinder Replacement (hastee)

Thank you hastee. I really appreciate your input. I can't wait for my brakes to be better! Hopefully I won't find any crud in the lines. So, let me see if I have this straight:<p>First, open one of the bleeders from one of the brakes and let the fluid drain out.<br>Second, remove the old and install new MC and seals, <br>Third, fill up the reservoir and power bleed as usual. <p>How do I know when the system has been completely flushed?<p>Also, do you recommend a particular brake fluid?<p>Sounds pretty simple actually.<p>Thanks!
 

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Re: Master Cylinder Replacement (IRoll4me)

I would bleed TWICE by hand, not a power bleeder, (two people) before you start removing and replacing the master.<br>A "mushy" pedal is not uncommon on these car and you may be wasting your money.<br>My silver was like that but after a proper (not machine) bleed and new fluid it came back fine<br>Not the absolute best one but it's stayed the same for 20k miles now
 

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Discussion Starter · #5 ·
Re: Master Cylinder Replacement (JRL)

I did one bleed when I replaced my rotors and pads but I didn't do a complete fluid replacement. <p>I guess the reason I immediately jumped on the master cylinder is because I thought I remember reading somewhere that the MC on the 98 S70s was a common point of weakening or failure of the brake system. I could have misread what they were saying it was quite a while ago.<p>At what point would you go to replacing the MC? Also, I'm a little confused as to which bleeding method is the best to use now. I was under the impression that using a power bleeder was the way to go. I remember performing the two person bleed on the 242 and if you do it correctly it took a while to do but it really is thorough and worked well. <p>Should I use the "super blue" stuff that IPD sells or another brand/type?<p>Thanks for your input.<br>
 

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Re: Master Cylinder Replacement (IRoll4me)

<B>Add SS brake lines</B>, (IPD, yours are probably cracking and on the way out anyway)<br>Bleed either way you want but you MUST use new fluid and thoroughly BLEEEEEEEEEEEEEED!<br>After all that, see what you got
 

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Discussion Starter · #7 ·
Re: Master Cylinder Replacement (JRL)

Okay. That is the way I will go. <p>Which fluid do I use? SL 6, 200 or Super Blue<p>Thanks!
 

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Re: Master Cylinder Replacement (IRoll4me)

i use the ate 200. same as the super blue, just not blue. it is what the volvo brake fluid is. same boiling points, dry or wet.<p>i use the motive gear. i go down to their work in berkeley, go in the door, and a couple guys scream hide everything!!!!! it is HIM again!!!!<p>i use the power method of brake bleeding just 'cause it is faster and simpler.<p>JRL is absolutely correct in advising an upgrade to stainless steel brake lines too. with the age of your car problems probably have begun with the rubber lines. volvo's do well usually, but the ss lines will bring a lot of resilience to the system. much 'harder' pedal feel, and control.<p>the sl 6 i do not know much about. when i raced cars we used motul racing stuff and needed to really flush all the system.<p>so, good luck. you will do a great job, i can tell.
 

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Re: Master Cylinder Replacement (IRoll4me)

oh, the advantage of the super blue is that it becomes rather evident when a full fluid change has occured. that is about the only reason it is made i think.
 

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Discussion Starter · #10 ·
Re: Master Cylinder Replacement (hastee)

Thanks Hastee! I appreciate the vote of confidence. <p>I decided to get the blue stuff. . .
 
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