Jerry. Do not push back the pistons without opening the bleed screws first! This will allow the yukky brake fluid to exit as you press in the pistons and, when you pump the brakes at the end, it will pass new DOT4 into the calipers. Top up with new fluid. You can replenish the fluid by removing as much as possible from the reservoir also. The reservoir cap is vented to atmosphere so it collects moisture slowly. New rotors a la Rusty and pads, Akis are good so are Pagid or whatever he recommends. My $0.02 Fred Moir Lynn MA Diesel preferred.
>________________________________ > From: Jerry Herrman <jer...@san.rr.com> >To: mercedes@okiebenz.com >Sent: Monday, July 23, 2012 9:35 PM >Subject: [MBZ] "Bleeding" Brakes > >This submission is a question mainly directed at those individuals who do >their own brake work and have had to deal with this issue. When replacing disc >brake pads that are worn considerably, it is necessary to push back the wheel >cylinder pistons to allow room for the new, thick pads. This normally results >in the fluid backing up to the master cylinder (MC) where it could possibly >overflow, especially if all four wheels are getting new pads. The only >recommendation I have read is to suck out some of the fluid from the MC. I am >asking if this is a good idea. If I were to drain off fluid, I would prefer to >remove it from a wheel cylinder which is the part of the system most likely to >have some contamination, from the constant movement in that area. (I realize, >of course that I am free to do this, and in fact this is what I did this >weekend on my 91 Volvo, using a hose and a jar, though I suspect I allowed a >minute amount of air into the system). >If this is a good way to proceed, would it be better to bleed off a certain >amount from the caliper on the wheel you first work on, or would it be better >to open the bleeder valve just before pushing the piston back on each >individual caliper? >Another issue I have is that of opening the cap on the MC. Does this allow >moisture (say, on a humid day) to enter the MC? >Also, I worry about fluid going backward in the system - it just seems wrong >somehow. >And what about cars with ABS? What happens to fluid going "backwards" on those >cars? >Whadda you guys do? > >Jerry >82 240D >91 Volvo 240 >and others > > >__________ Information from ESET Smart Security, version of virus signature >database 7323 (20120723) __________ > >The message was checked by ESET Smart Security. > >http://www.eset.com > >_______________________________________ >http://www.okiebenz.com >For new and used parts go to www.okiebenz.com >To search list archives http://www.okiebenz.com/archive/ > >To Unsubscribe or change delivery options go to: >http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
