Quote:
Originally Posted by qwerty
The o-ring between the MC and booster is a vacuum seal and should never see brake fluid. The MC has a small weep hole near the booster junction; unless the rear shaft seal has also failed, fluid should not leak into the booster. Thanks.
On models with the piston-type vacuum pump, the pump vents into the crankcase, so any brake fluid that enters the booster could wind up in the engine oil. OK. All the ones I've owned don't have any obvious way.
What pressure?
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I will have to look that up, but I would think in the 20 range, pretty much what the vac pump makes.