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brake master cylinder question
1948 Pontiac
Master cylinder extremely difficult to get to. Drilled and tapped fill cap, attached hose running to a reservoir mounted high up on the firewall. Reservoir is a salvaged clutch reservoir. Question: Seems to work OK, but, system is kind of sealed. I assume there is no air within the top of the master cylinder. Is this a problem? Comments, suggestions appreciated. Ivan Vegvary |
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#2
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brake master cylinder question
On 8/15/2014 1:37 PM, Ivan Vegvary wrote:
> 1948 Pontiac > Master cylinder extremely difficult to get to. > Drilled and tapped fill cap, attached hose running to a reservoir mounted high up on the firewall. Reservoir is a salvaged clutch reservoir. > Question: Seems to work OK, but, system is kind of sealed. I assume there is no air within the top of the master cylinder. > Is this a problem? > Comments, suggestions appreciated. > Ivan Vegvary > I don't know the answer to your question but for a zillion reasons you ought to develop the habit of regularly purging the whole system with new fluid on classic cars. Brake fluid is hygroscopic and corrodes master cylinders if left a long while. Your vehicle is not dual-diagonal so a rusted through brake line is a serious matter. Etc. -- Andrew Muzi <www.yellowjersey.org/> Open every day since 1 April, 1971 |
#3
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brake master cylinder question
Ivan Vegvary wrote:
> 1948 Pontiac > Master cylinder extremely difficult to get to. > Drilled and tapped fill cap, attached hose running to a reservoir mounted high up on the firewall. Reservoir is a salvaged clutch reservoir. > Question: Seems to work OK, but, system is kind of sealed. I assume there is no air within the top of the master cylinder. > Is this a problem? > Comments, suggestions appreciated. > Ivan Vegvary As long as the new reservoir isn't kept full and the hose is 3/8" or so it should be fine. The reason for the "extra" room is so that as the fluid heats up and expands it doesn't apply the brakes for you! I second the idea of keeping fresh fluid in there, and if possible updating to a dual split system. Should be easy using a master from a dual drum vehicle. -- Steve W. |
#4
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brake master cylinder question
Ivan Vegvary > wrote in
: > 1948 Pontiac > Master cylinder extremely difficult to get to. Shouldn't there be an access-panel set into the floorboard? Back then, such things were meant to receive constant attention, and provision was usually made for just that. > Drilled and tapped fill cap, attached hose running to a reservoir > mounted high up on the firewall. Reservoir is a salvaged clutch > reservoir. Question: Seems to work OK, but, system is kind of sealed. > I assume there is no air within the top of the master cylinder. Is > this a problem? You're fine. No air is no problem at all. If the brakes continue to work properly, then your fix is good (and a good idea). But it's not "correct"; you may get frowny-faces from purists at your next show. -- Tegger |
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brake master cylinder question
On Friday, August 15, 2014 2:37:50 PM UTC-4, Ivan Vegvary wrote:
> 1948 Pontiac > > Master cylinder extremely difficult to get to. > > Drilled and tapped fill cap, attached hose running to a reservoir mounted high up on the firewall. Reservoir is a salvaged clutch reservoir. > > Question: Seems to work OK, but, system is kind of sealed. I assume there is no air within the top of the master cylinder. > > Is this a problem? > > Comments, suggestions appreciated. > > Ivan Vegvary Studebaker actually offered a remote reservoir for its cars with the under floor master cylinder, so I don't see the issue with your setup. If you used a clutch reservoir the cap should have a bellows with a hole in the cap on the atmosphere side of the bellows, so again, no problem. nate |
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brake master cylinder question
Nate, thanks for the info and your time.
Ivan Vegvary |
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brake master cylinder question
On Monday, August 18, 2014 2:25:51 AM UTC-4, Ivan Vegvary wrote:
> Nate, thanks for the info and your time. > > Ivan Vegvary Another thought. Unless you drilled through the vent hole in your old cap for the fitting (presumably this is a typical Jeep/Studebaker underfloor MC with the metal cap, and you used a right angle NPT to hose barb fitting?) you will need to find how the old cap is vented and fill the vent with a loctited grub screw, braze, solder, etc. nate |
#8
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brake master cylinder question
Drilled through center of cap and threaded 1/4" NPT. Installed barbed fitting.
Ivan Vegvary |
#9
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brake master cylinder question
On Monday, August 18, 2014 9:29:39 AM UTC-4, Ivan Vegvary wrote:
> Drilled through center of cap and threaded 1/4" NPT. Installed barbed fitting. > > Ivan Vegvary The typical old American MC that I'm thinking of had the vent hole on the side of the hex of the cap. May want to have a look at that before you fill it up with fluid, so it doesn't leak out and down the side of the MC/frame rail. nate |
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