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-   -   W124 dot 3 vs dot 4 fluid change (http://www.peachparts.com/shopforum/tech-help/409031-w124-dot-3-vs-dot-4-fluid-change.html)

speednjay 11-06-2020 10:40 AM

W124 dot 3 vs dot 4 fluid change
 
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.

Mike D 11-06-2020 11:39 AM

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

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

porkface 11-06-2020 01:47 PM

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

speednjay 11-06-2020 05:45 PM

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

Sugar Bear 11-06-2020 08:10 PM

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!!!

pawoSD 11-08-2020 12:52 AM

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

tjts1 11-08-2020 11:15 AM

Quote:

Originally Posted by pawoSD (Post 4109446)
Dot 4 is recommended to be used in ABS equipped systems as it improves response/function due to lower viscosity.

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

speednjay 11-08-2020 01:43 PM

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

speednjay 11-08-2020 02:43 PM

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?

Zulfiqar 11-09-2020 11:25 AM

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.

pawoSD 11-09-2020 11:31 AM

Quote:

Originally Posted by tjts1 (Post 4109563)
Read the label, viscosity is the same. Most ABS equipped cars use DOT3

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

Zulfiqar 11-09-2020 12:42 PM

Quote:

Originally Posted by pawoSD (Post 4109915)
MB Come with DOT 4 from the factory....and is what they spec for use.

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.

speednjay 11-13-2020 09:20 PM

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.

Zulfiqar 11-16-2020 09:46 AM

Quote:

Originally Posted by speednjay (Post 4112105)
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.

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.


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