I’m replacing a caliper on my 124. I have a **** ton of dot 3 in the garage. Would bleeding through lines with dot 3 be a bad idea? From what I understand there’s no difference in the dot 3/4 except the boiling temps which are pretty close. I only use this car as work commuter. I just wanna use up the fluid I already have.

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Very little difference between the two. Mixing them is fine.

Mixing either of them with DOT5 is the big no-no!

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

sealed bottles? any open bottles can attract moisture which defeats the purpose. that's why they insist on sealed containers.

Yup everything sealed. How long would it take to bleed the system with a power bleeder?

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Try to use the correct spec as it is brakes. If the bottles are ANCIENT, sealed or not then I wouldn't use them as brake fluid absorbs water through the sealed containers over years...i.e., it has a shelf life.

How long to pressure bleed??? 30 minutes start to finish. Keep a close eye toward keeping the rear half of the brake fluid reservoir full as it fills slowly and it can be hard to see.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Dot 4 is recommended to be used in ABS equipped systems as it improves response/function due to lower viscosity.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Read the label, viscosity is the same. Most ABS equipped cars use DOT3

__________________
CENSORED due to not family friendly words

Hey when I took the brake line off the caliper nothing came out. Bone dry. That means the line is plugged right?

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

I have fluid coming from Front master cylinder Into abs pump. Front Pass side Is circulating but driver side at the pump is dry. Is there a way to fix this without replacing the pump?

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

try tapping the ABS pump with a small hammer to see if it frees up. If it doesnt flow then you need a new ABS pump.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

MB Come with DOT 4 from the factory....and is what they spec for use.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Not much of a difference between the two to think about it - Infact if you hire a shop to flush your brakes out. there is a 80% chance you will get DOT3 fluid.

the DOT4 and DOT3 debacle also happens on Honda and mazda forums - while in real world its negligible unless you are tracking the car.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

So I put in a used abs pump, bled lines fresh fluid and oh lord the difference is night and day. I think that caliper might Not have been fully functional for a while.

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

If you keep on top of brake fluid flush every year or two, you will almost never have to change the hydraulic parts of the system.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)