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  #1  
Old 05-17-2011, 06:23 PM
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Brake vacuum booster...is it neccessary? 1973 280C M110

The vacuum brake booster on the passenger front of my M110 is giving me grief. It seems all other 280Cs, I've seen, don't have this. Why is it there? Can I bypass the pump (see pic) and go directly to the intake manifold? Seems to be plenty of vacuum at the manifold. Also, I updated my Steering box post with some pics...Pg. 2, (4.28.11).


Last edited by Ark of MU; 05-17-2011 at 07:15 PM. Reason: added picture
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  #2  
Old 05-18-2011, 12:34 AM
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vacuum pump

Not all 280"s have vacuum pumps. I hooked mine directly to the intake manifold and it worked fine.
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Old 05-18-2011, 11:26 AM
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The vacuum pump on DOHC M110 engines merely obstructs justice, siphons power and provides a direct path for oil mist in the crankcase to be sucked into the manifold and burned, sometimes in spectacular quantities--Mercedes dispensed with them circa '75 or so.

There's a stamped-steel cover plate you can buy from Mercedes or pick up in a salvage yard to mask off the hole in the camshaft tower. You'll need shorter screws or closing bolts--any gasket paper or rubber will do--I've used inner tubes.

The plastic piping to/from the intake manifold is re-routed to the booster on the power brake assembly--you keep the big check valve in line between the two. Good luck



Tim Kraakevik
kraakevik@voyager.net
Four 114's, four M110's
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Old 05-20-2011, 12:10 PM
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So on a car like this would you just remove the pump and bypass the pump by running the brake line right into the manifold?

I may look into this, as I think it's #1 ugly and #2 a power sapper.
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Brake vacuum booster...is it neccessary? 1973 280C M110-clean-280c1.jpg  
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'74 280C - gone to a new home for the finishing it deserves.
'64 356SC
'74 914 2.0
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Old 05-20-2011, 12:12 PM
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Like this....only I'd remove the pump on the front of the engine...
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Brake vacuum booster...is it neccessary? 1973 280C M110-m110-carbed.jpg  
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'74 280C - gone to a new home for the finishing it deserves.
'64 356SC
'74 914 2.0
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  #6  
Old 05-20-2011, 07:08 PM
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Nathan

Yes--but you need a cover plate on hand, shorter closing screws and an assortment of metric allen sockets of varying length to get the pump off--it may take some time


Tim Kraakevik
kraakevik@voyager.net

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