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On my 142, there is no gasket between the base of the MC and the booster housing. Could be different on an 1800; but, I doubt it. There is nothing to seal back there.

If you ask because you are leaking brake fluid out around the mating surface, its probably time for a new master cylinder. Don't attempt a rebuild. New ones are available fairly cheap from the various Volvo specialists (Iroll motors, VP auto, High performance auto, maybe IPD, scandcar, CVI) and sometimes if you luck out, Rockauto.
 

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Discussion Starter · #3 ·
Master Cylinder

On my 142, there is no gasket between the base of the MC and the booster housing. Could be different on an 1800; but, I doubt it. There is nothing to seal back there.

If you ask because you are leaking brake fluid out around the mating surface, its probably time for a new master cylinder. Don't attempt a rebuild. New ones are available fairly cheap from the various Volvo specialists (Iroll motors, VP auto, High performance auto, maybe IPD, scandcar, CVI) and sometimes if you luck out, Rockauto.
I am installing a new master cylinder , but I thought there should be a seal on the back of the master to maintain the vacuum within the chamber , I know other cars have "O" rings and gaskets I was surprised when I did not find a seal on the 1800s brake booster so I thought I would ask I might just make my own thanks again 142 Guy
 
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