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new 19mm master cylinder
I notice that Ate are shipping the OEM 19mm master cylinders with 3 pin brake light switches.
My old one has only 2. Is this because it is an '84 with no rear window brake light which presumably would be the third device being actuated by the newer 3 pin switch? Should I just salvage the switches out of the one being replaced and will they require new gasketts or anything? cheers.
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cheers, Phil 84 ROW Carrera (guards red), A/C delete, Fuchs 7 + 8 x 16, Koni Adj. F+R, sway bars 20F 22R. turbo tie rods, Strut brace, brake cooling kit, C/F Recaro GT3 copies. Last edited by sus911; 08-02-2006 at 04:42 PM.. |
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08-02-2006, 04:09 PM
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CORRECTION!!!!
I meant 3 PIN switches. Sorry about the confusion.
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cheers, Phil 84 ROW Carrera (guards red), A/C delete, Fuchs 7 + 8 x 16, Koni Adj. F+R, sway bars 20F 22R. turbo tie rods, Strut brace, brake cooling kit, C/F Recaro GT3 copies. |
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08-02-2006, 04:41 PM
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Any Aussies chime in?
I think it may be a DOT rating thing or is it perhaps an earth. Anyone know why some switches have 3 pins and some jiust 2 like mine? Phil
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cheers, Phil 84 ROW Carrera (guards red), A/C delete, Fuchs 7 + 8 x 16, Koni Adj. F+R, sway bars 20F 22R. turbo tie rods, Strut brace, brake cooling kit, C/F Recaro GT3 copies. |
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08-03-2006, 02:44 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Phil,
The 1984 - 89 master cylinders used switches with two contacts wired in parallel strictly to operate the brake lights. The 1977 - 83 master cylinders used switches with 3 contacts [diagram below] to trigger the brake system warning light logic relay if one of the two switches failed to operate ... in addition to operating the brake lights. 
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-03-2006, 04:23 AM
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1984 Porsche 911 Carrera
Triumph Sprint ST 1050
2006 Triumph Daytona 955i
