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56 savoy master cylinder cap leak
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brand209
Posted 2019-03-21 7:35 PM (#579686)
Subject: 56 savoy master cylinder cap leak


Regular

Posts: 54
2525
any tips to make the suicide pot top not leak? I'm new to this and i did a search but didn't see anything. Thanks in advance.
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westaus29
Posted 2019-03-22 2:53 AM (#579699 - in reply to #579686)
Subject: Re: 56 savoy master cylinder cap leak


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Posts: 49
25
Location: Mandurah, Western Australia
I initially had a problem with my 55 Belvedere leaking brake fluid around the master cylinder cap (manual brakes with remote booster). I traced it to the pinhole vent in the cap. With the cap off, when I depressed then released the brake pedal, I noticed a small fountain of brake fluid in the reservoir which would have hit the lid, causing some to come out the vent hole. I made a new rubber gasket for the lid with only a small off-centre hole located away from the vent area. Problem solved.
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brand209
Posted 2019-03-22 4:12 PM (#579719 - in reply to #579686)
Subject: Re: 56 savoy master cylinder cap leak


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Posts: 54
2525
I don't think my rubber has a hole it has a multi ribbed circle like plunger and the fluid is leaking down the sides not the top
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brand209
Posted 2019-03-22 7:10 PM (#579725 - in reply to #579686)
Subject: Re: 56 savoy master cylinder cap leak


Regular

Posts: 54
2525
I did notice i had some buildup on the caps rim where is seals down and on the top of the pot, I scraped it away and have re tightened it I will see how this works.
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westaus29
Posted 2019-03-22 8:29 PM (#579727 - in reply to #579725)
Subject: Re: 56 savoy master cylinder cap leak


Member

Posts: 49
25
Location: Mandurah, Western Australia
My cap seal was a thin rubber ring. It sounds like your seal may be original and designed to prevent leakage from splashing out the vent hole. I would have thought it would have a vent hole in it to compensate for fluid level changes. Maybe it has a concertina like action?
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57chizler
Posted 2019-03-23 4:14 PM (#579766 - in reply to #579727)
Subject: Re: 56 savoy master cylinder cap leak



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Posts: 3141
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Location: NorCal
There are two style gaskets for the lid, the type that is merely a thin ring to seal the rim and the full gasket type with a small hole in the center to allow the bolt to pass through. The latter type prevents the geyser from shooting out the vent but still allows enough air flow to compensate for the drop in fluid level.
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