116 Brake Bleeding Trouble - Unable to Bleed..? Master Cylinder Bad ?? - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 09-22-2016, 02:18 PM Thread Starter
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116 Brake Bleeding Trouble - Unable to Bleed..? Master Cylinder Bad ??

Gents

I have own a 116 chassis - 450 SEL for over 25 years now, and have done a couple of Resto's and quite a number of routine repairs on it.

The vehicle has now sat for a number of years 10 +, and I am working on getting it back on the road again.

Was driving it the other day and tried the brakes hard to test, and felt something not quite sure what it was, but now have lower pedal..?

Thought I would start with a Brake Bleed to remove air from the system to get more pedal back.

Started with the RR cylinder, and did not get much fluid out at all after several pump and hold's with the wife assisting. We have done this together before on any number of cars including this one.

Tried again several times and still not much of any fluid - only a very slight amount.

So thought I would move to left side LR to see if I could get any fluid out of there, and the same thing happened on this wheel cylinder although this time was next to nothing came out at all..?

Guess that I am thinking, and really looking for confirmation that the current problem is a bad Master Cylinder..??

Any thoughts would be appreciated. I am going to flush the lines with new fluid once I get the brake fluid flowing.

Let me know if you think I am heading on the right direction, or if it is something else..?

I don't think the calipers are frozen, but maybe I'm off on that...?

I thought the Master Cylinder was the better bet at this point to try replacing.

Appreciate any input you would be willing to provide.

Danke

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post #2 of 3 (permalink) Old 09-22-2016, 06:55 PM
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Your hoses may be internally collapsed.


Then get a vacuum bleeder from harbor freight and you will never have to ask your wife to help again.


Brake Fluid Bleeder

also watch this:




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post #3 of 3 (permalink) Old 09-25-2016, 02:43 PM Thread Starter
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Got Harbor Bleed tool - Bled out - Still have air on right side?

Got Harbor Bleed tool - Bled out - Still have air on right side?

Appreciate the suggestion to buy the Harbor Freight bleed tool.

Hooked it up and bled all the lines, so now have new brake fluid in the system, but I still have air sucking through on the right side... RR right rear, and RF right front?

Left side rear and front worked just fine and no bubbles, but I still have no brake pedal as there is air in the system..?

Am I now back to my first thoughts of master cylinder?

No visiblGot Harbor Bleed tool - Bled out - Still have air on right side?

Appreciate the suggestion to buy the Harbor Freight bleed tool.

Hooked it up and bled all the lines, so now have new brake fluid in the system, but I still have air sucking through on the right side... RR right rear, and RF right front?

Left side rear and front worked just fine and no bubbles, but I still have no brake pedal as there is air in the system..?

Am I now back to my first thoughts of master cylinder?

No visible fluid leaks anywhere, and flex supply lines appear to be replaced at some point and actually look pretty new.

Any thoughts of other problems?

Good suggestion on the Harbor fluid pump, as did not have to ask the wife to help on this.

Fluid all changed, but still have air in the system on the right side...

Appreciate further suggestion, or confirmation of MC replace as next.

Danke

Lfryklue fluid leaks anywhere, and flex supply lines appear to be replaced at some point and actually look pretty new.

Any thoughts of other problems?

Good suggestion on the Harbor fluid pump, as did not have to ask the wife to help on this.

Fluid all changed, but still have air in the system on the right side...

Appreciate further suggestion, or confirmation of MC replace as next.

Danke

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