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Discussion Starter #1
When applying the brake the main cylinder "snores" and the car only brakes on 1 of the 2 circuits.

Could it be the main cylinder seals? If so, can one get just the seals or should I get another maincylinder?

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Discussion Starter #2
Have bought a rebuild-kit today so I'll start with that. The car draws brake fluid but dont leak it anywhere visible so I assume the seals are bad in the main cylinder.
 

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The car draws brake fluid but dont leak it anywhere visible so I assume the seals are bad in the main cylinder.
Apparently it leaks into the vacuum brake booster. And burns your brake fluid in the engine.

Personally I would install an all new master cylinder. No experiments there. Very likely the cylinder bore is bad, too - which makes the seals fail.
 
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