My master cylinder cap was leaking on my '58 Fairlane so I purchased a new one. I refilled the master cylinder and installed the new cap. The cap has two holes in it (I think to vent out the air) but when I apply the brakes, fluid shoots out of the holes. Did I put too much fluid in?

58 Ford Custom 300 - San Pedro, CA (So-Cal)

Did you bench bleed the master before installing?Sounds like air in the cylinder.

  

The master cylinder was never removed, just the cap. Would air in the master cylinder cause it to spit out brake fluid from the cap?

58 Ford Custom 300 - San Pedro, CA (So-Cal)

I hate to ask this but is there a rubber seal under the cap?

Ol'ford nutCentral Iowa

56 Vic w/292 & 4 spd.

No, just the gasket for the cap itself. Should there be a rubber diaphram of some sort underneath? If so, where can I buy one??? or can I make one???

58 Ford Custom 300 - San Pedro, CA (So-Cal)

In the manual it does'nt mention any diaphram below the cap.

58 Ford Custom 300 - San Pedro, CA (So-Cal)

Only the gasket as shown is used.I am not sure why you are having trouble.Maybe someone else will.I didnt read your original post properly.

  

After reading the manual I think I may have put too much fluid in. The manual states "fill the master cylinder up to 1/2" below the top of the fill opening" Could this be it?

58 Ford Custom 300 - San Pedro, CA (So-Cal)

I would try that. The stock master cylinders that I had on my 54 and 56 TBird did not have any vent holes in the cap.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Hi Paul.You are correct about no vents.I just remembered the one that was on mine originally was a solid cap.If you look at Ebay item # 190437936565 you can see its solid.Even the replacement dual master on mine now has the solid steel clip-on cap with a rubber seal under it and no vents.