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Join Date: Mar 2002
Posts: 3,563
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Adjusting Brake Light Sensor/Switch?
Hi,
Is there a HOWTO procedure on how to adjust the brake light sensor/switch? I find I have to apply a fair amount of force on the brake pedal in order for my brake lights to switch on. This can be rather stressful when driving in peak traffic in wet rainy conditions 
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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08-07-2005, 04:51 PM
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There's no adjustment. The switches need to be replaced.
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Don 24 Cayman GTS - GT Silver 23 Cayman GTS - Arctic Grey - Sold 97 993 Coupe - Arctic/Black - Sold 13 991 Coupe - Platinum/Black - Sold, 87 911 Coupe - Venetian Blue |
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08-07-2005, 05:02 PM
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Oh OK. Is this an easy task? Is there a URL outlining the procedure?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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08-07-2005, 05:22 PM
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Join Date: Jun 2000
Location: bottom left corner of the world
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They are the things on the master cylinder. Try ging them a clean (on the inside) with some brake fluid. If this doesn't help you may need to replace them. They may be the same part, or size, as a VW one without the Porsche prices.
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08-07-2005, 05:33 PM
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I had to replace mine on an '87. It is easy.
You just need a deep socket (23mm I think). Have plenty of rags about underneth. Remove the wire plug and loosen with the socket. Once it is hand loose, stage the new nearby. If you are quick, you can switch them and not lose brake fluid or get air into the system forcing you to perform a bleed. There are two sensors on the '87, They are $8-12 ea here on Pelican. I have heard that there is a volkswagon part that is the same only cheaper if you are willing be "unpure"... On mine, it looked like this: http://www.pelicanparts.com/catalog/images/wayne_new/19mm_master_cylinder.JPG This picture shows the rear installed, it is the silver part with the gold spade, the front is not installed. This is the assembly below the brake fluid assembly in the front boot. HTH, Paul P.
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2006 Boxster '87 Carrera Targa"Crystal Blau" (gone) |
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08-07-2005, 05:34 PM
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Make Bruins Great Again
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Behtley's Manual:
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-------------------------------------- Joe See Porsche run. Run, Porsche, Run: `87 911 Carrera |
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08-07-2005, 06:59 PM
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Location: TX USA
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The switches are not 'unpure' ... just VW parts made by Hella & supplied by Ate, originally listed in the Porsche parts catalog with VW part numbers ... so your options are many for a source!
The pic posted above is of an un-boosted master cylinder, not a '77+ vacuum-boosted master cylinder! The diagram below has the correct master cylinder with the two VW switches off the side. This topic has been discussed to death ... do a search! 
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' Last edited by Early_S_Man; 08-07-2005 at 08:04 PM.. |
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08-07-2005, 07:08 PM
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1987 Porsche 911 3.2
2013 991 Carrera
87 Targa
2006 Boxster "Mary Jane"
Max
