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Join Date: Jun 2004
Location: Friendswood, TX
Posts: 500
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Brake Trouble Switch Leak!
So,
I was rebuilding my brake system on the 74' 911 after its 20 year dormancy by rebuilding and replacing all the rubber parts. I rebuilt the master cylinder, calipers and put new rubber lines all round. I was in the process of bleeding the brakes and noticed that the trouble light switch on the master cylinder was leaking through the stem of the switch plunger. So I bought a new one all fresh and new from ATE, and it leaks too!!!  So, now I ask, did I get a bum switch or are the seals around the brass pistion in the master cylinder that triggers the switch the problem? They were the only seals that were not part of the rebuild kit. Are these seals available? Appriciate your help.
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John F. Lewis 74' 911S Targa + 930/02 76' 914 - Eternal Type IV project FOR SALE |
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05-13-2005, 07:37 PM
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Location: Friendswood, TX
Posts: 500
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CR@P!
I found out that one of the seals on the piston that the trouble light switch rides on is broken. Unfortunately, those seals do not come with the rebuild kit much less have a part number. So, after a $70 rebuild kit and a $30 pressure switch. It looks like I'm staring at a new $170 master cylinder for a $1 seal. Ahh the joys. Does anyone have a source for these seals? I will check on the classified adds, but does anyone have a trashed 19mm master cylinder that I could salvage this trouble light piston from?
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John F. Lewis 74' 911S Targa + 930/02 76' 914 - Eternal Type IV project FOR SALE |
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05-16-2005, 10:39 AM
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Try using teflon tape.
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1972 911T 1991 Mazda RX-7 Turbo II Are you car loosing power? When was last time you service your fuel injectors? Dirty fuel injectors? Why no try a complete fuel injector cleaning service and return the dignity to you car. Visit www.rennsportfuel.com and we will return your injectors back to life! |
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05-17-2005, 09:10 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Forget the Teflon tape, or more torque, either! That switch doesn't mount to a 'wet'` area of the master cylinder!!!
If there is a leak ... it is from the O-rings on one olr both of the two plungers that operate the switch! Take out the hex plug and replace the O-rings.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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05-17-2005, 09:56 AM
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Join Date: Jun 2004
Location: Friendswood, TX
Posts: 500
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Thanks Warren,
That is my problem. One of the seals on the plunger is shot but it is not a simple o-ring, it is a cup type seal like the main master cylinder seals. And the seal does not have a part number according to our host along with other Porsche parts houses. So there is no way to order one. Blume Dispare and Agony on me...
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John F. Lewis 74' 911S Targa + 930/02 76' 914 - Eternal Type IV project FOR SALE |
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05-17-2005, 10:36 AM
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Join Date: Jul 2002
Location: Southern California
Posts: 5,067
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These guys bill themselves as "automotive hydraulic specialists." Maybe they have a seal that will work. It's worth a call.
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1984 Targa |
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05-17-2005, 01:06 PM
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1972 Porsche 911T 2.4 Weber
Time Machine
