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#16
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Well we'll have to wait and see what the actual outcome is I suppose; but, the OP originally reported no problem getting sufficient pedal and pressure prior to the problem with his not being able to seal the bleeder to be leak free. Then he mentions leaving the bleeder out and the system open for a period of time. Doing that will allow all the fluid to drain out of that caliper's vacant bleeder screw opening. Then later the OP details he applied vacuum to the bleeder and could not draw any fluid, if there was fluid in the rear reservoir he would have drawn it towards the caliper. All those things considered I'll stick with the drained rear reservoir compartment until more information pointing to some actual MC malfunction is revealed. The good thing is it will be quite easy and inexpensive for my theory to be confirmed or refuted whereas fooling with the MC will require much more effort and expense to verify the theories around that. |
#17
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but your description of pedal travel going to full stroke to allow the other circuit to operate is not correct... both front and rear are operating independently and at the same time... There can be differences built into the system due to the amount of fluid required for regular brakes on the rear and discs on the front.. but those are adjusted by things like bore size...so the same pedal travel stroke produces those needed differences.... https://www.google.com/search?q=master+cylinder+dual+circuit&biw=939&bih=602&tbm=isch&imgil=A-S_pFUtkEZ4KM%253A%253B8nCRTg4G0hK-KM%253Bhttp%25253A%25252F%25252Fwww.tegger.com%25252Fhondafaq%25252Fmastercylinderreplace%25252Fhoww orks.html&source=iu&pf=m&fir=A-S_pFUtkEZ4KM%253A%252C8nCRTg4G0hK-KM%252C_&usg=__qhrgALcZGJRLw088q7PD1cSSc0I%3D&dpr=1.09&ved=0ahUKEwjv7IWG2MfQAhXnilQKHS_XCHYQyjcIbw&ei=1Ck6WO-yCeeV0gKvrqOwBw#imgrc=A-S_pFUtkEZ4KM%3A
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#18
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You have miss quoted me and have absolutely no idea how a single bore dual circuit brake master cylinder operates.
Try reading what I posted again without cutting relevant information out of the middle. |
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I did not misquote you because I did not change anything you said... I just left out the part which did not pertain to what I was pointing out was not true.
Did YOU go and look at the pics in the google article ? This statement "pedal travel will go full stroke to allow the other circuit to operate." is not true... both the front and rear operate upon the same stroke. One is not having to travel full stroke... ' to allow ' the other to operate.
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#20
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#21
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I've highlighted the portion of my quote you deleted and colored red the portion vital to the point I was making.
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#22
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97 SL320 One circuit developing a leak has nothing to do with the functioning of the other section of the circuit. It does not have to do anything to ' react ' to the leak in the other side... it is oblivious to that leak.. it just functions according to the physics incorporated in how it was constructed.... a bore with a sealing piston pushing brake fluid...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
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Losing fluid in one circuit doesn't force the other to go to full stroke to allow braking. The pushrods are a solid connection and will operate regardless of the fluid level.
What WILL happen is a dramatic change in FEEL of the brake pedal, making it far mushier (is that a word?) since you're now only compressing half of the working fluid. This does allow you to push harder on the pedal, but it isn't the result of pushing one of the circuits through full stroke to operate the other.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#24
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You should buy a pressure bleeder. I have one and it has allowed me to bleed my brakes all by myself. Also, you can do a brake fluid flush to get rid of all the old brake fluid. FYI, you should also change out all 4 brake lines because they do break down internally from old brake fluid, it's cheap insurance from your brakes locking up and not releasing.
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#25
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#26
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I got the Motive one from Amazon with the European adapter. I actually fill the master cylinder to the very top with brake fluid instead of filling the Motive pressure bleeder, there is no cleanup after you are done! Also, you can purchase other master cylinder caps for your pressure bleeder to work on other vehicle makes.
I should have bought the Motive pressure bleeder 20 yrs ago when I first started working on cars!!!! |
#27
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The push rod is only attached to the left piston, a column of fluid operates the right piston as there isn't a rigid connection between the two. If there was a rigid connection, the braking system half that had the least free travel would cause the piston to stop moving before the other had a chance to build sufficient pressure.
The pic referenced in LMs post shows a spring between the two pistons, this is merely one of two return springs. When the column of fluid is lost between the two pistons due to a leak ( left brake line ) , the left piston must travel until it contacts the safety stop on the right piston. At this point the right piston is moved to generate hydraulic pressure. The pic referenced by LM makes note of this " This part begins to compress." If the leak occurs on the right piston, this right piston must bottom out in the bore before the left piston can generate any pressure. In either case, a leak will allow one of the pistons to travel full stroke. |
#28
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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It's interesting how LM says I'm wrong and provides a web site that proves what I'm saying is correct. Still want to go another round?
MASTERCYLINDER For the complete story with pics that matter, use the link provided. ( The MC in the pic does not have the 2 return springs, apparently they have been omitted for clarity. ) Quote:
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