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Brake Fluid Blow back out of Master Cylinder


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wink.gif I first want to thank everyone for the postings to my question about rod bearings for a Pierce Arrow/Seagrave V-12 engine.

crazy.gif Now I have another problem I hope someone can help with. I did a brake job for a friend on his 1950 Mack A Model Pumper. The brake system has a ,what I'll call a Hydrovac on it. When you apply the brakes the truck stops as it is supposed to but when you take your foot off of the brake pedal and rev the engine up brake fluid is blown out of the master cylinder through the small hole that is in the cap of the master cylinder. I'm at a loss for a reason for this to happen . Anybody got any suggestions? confused.gif Thanks

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