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Car Forum / Honda Cars / June 2006Brake Fluid Gunk.
Yesterday, I completed my second (solo) brake system flush. No bubbles, solid pedal, and a sense of satisfaction. I noticed the dark residue in the master cylinder reservoir (that still remains). Three questions. 1) Where does this come from? 2) Short of pulling and cleaning the master cylinder, can this be removed? 3) Can this buildup be prevented? Thanks for your feedback. > Yesterday, I completed my second (solo) brake system flush. No bubbles, > solid pedal, and a sense of satisfaction. [quoted text clipped - 8 lines] > > 3) Can this buildup be prevented? -------------------------------------- 1) It may be some of the seals wearing, or it's just airborn DIRT, which flows in and out when you use the brakes. 2) I remove the screen, then use a suction pump and a long bit of thin tubing to suck as much out as possible before starting to do a bleed. 3) Keeping the brakes properly adjusted (if you have rear drums) and keeping (compressible) air out of the brake lines might keep the contamination WAY down, but just changing the fluid per the schedule in the Owner's Manual should be enough. 'Curly' This sounds simple, but after sucking out the fluid, I wipe down the inside of the brake and clutch reservoir with a high quality paper towel before adding new fluid to my brake/clutch master cylinder. I get at least 90% of the nasty looking stuff out that way. > This sounds simple, but after sucking out the fluid, I wipe down the > inside of the brake and clutch reservoir with a high quality paper > towel before adding new fluid to my brake/clutch master cylinder. I > get at least 90% of the nasty looking stuff out that way. I just change my fluid once a year. Last year my master cylinder finally wore out (248,000 miles). Wanna see how much gunk I had when I dumped the fluid out? http://www.tegger.com/hondafaq/mastercylinderreplace/replacement.html See the pics about 2/3 of the way down.  SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ > Yesterday, I completed my second (solo) brake system flush. No bubbles, > solid pedal, and a sense of satisfaction. [quoted text clipped - 3 lines] > > 1) Where does this come from? Old fluid mixed with water, and oxidized by same. > > 2) Short of pulling and cleaning the master cylinder, can this be > removed? Suck it out. Turkey baster will do fine. > 3) Can this buildup be prevented? Flush fluid once per year. SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >>Yesterday, I completed my second (solo) brake system flush. No bubbles, >>solid pedal, and a sense of satisfaction. [quoted text clipped - 5 lines] > > Old fluid mixed with water, and oxidized by same. yup, with a liberal dose of deteriorated rubber in there just for good measure... tasty. >>2) Short of pulling and cleaning the master cylinder, can this be >>removed? [quoted text clipped - 4 lines] > > Flush fluid once per year. During my flush, I kept the reservoir at least half-full. No bubbbles into the lines. 1) When using the baster to remove the gunk, should I keep the reservoir half-full? Or, OK to suction the reservoir dry? 2) Is it too late to go back and just remove the gunk without a full flush this one time? I assume you are talking about brakes. If there is visible gunk, and you have a way to remove it, I would recommend removal. Then refill the reservoir. I would have recommended doing this first, though. Earle > During my flush, I kept the reservoir at least half-full. No bubbbles into > the lines. [quoted text clipped - 4 lines] > 2) Is it too late to go back and just remove the gunk without a full flush > this one time? SignaturePosted via a free Usenet account from http://www.teranews.com > During my flush, I kept the reservoir at least half-full. No bubbbles > into the lines. > > 1) When using the baster to remove the gunk, should I keep the > reservoir half-full? Or, OK to suction the reservoir dry? You can suck it right dry. As long as you don't push the pedal before you add more fluid, no air will get into the lines. Don't suck the fluid from the port holes. > 2) Is it too late to go back and just remove the gunk without a full > flush this one time? Nope. Remove anytime. SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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