Question about 1988 Porsche 911

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Brake lights only come on with very strong pressure. how do I adjust the brake light switch? 1988 Porsche Carrera

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  • spyder550dri Aug 29, 2010

    Thanks but my brake arm is attached (hinged) to he floor - there is no top per se that I can see. Are you referring to a 1988 911 Carrera? Thanks.

  • spyder550dri Aug 29, 2010

    Michael - Thank you but I have already seen this solution and it does not make sense to me. First it does not state exactly where the switch is located and I cannot locate the switch in my car. Second it involves fabrication of non-standard home-made parts which I am sure Dr. Ferry Porsche did not have in mind. Third he does not start with Porsche replacement part - it is from a 1978 Chevy! This seems like a gerry-rigged solution that involves significant extra work and is not Porsche standard. Thanks Very Much but I need to get advice from who has actually done this job. Tom

  • spyder550dri Aug 29, 2010

    Neither answer is adequate. The switch location is key and there is no switch where Bunnydawg's answer says there is. Michael's answer is one I have already seen posted and
    does not make sense as the provider had to fabricate parts vs. just replace and uses non-porsche parts. Please direct me to someone who has actually done this work.

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This problems happens due to gap between the brake light switch and the brake linkage rod. Try this procedure as follows,then check out.:--- The tools required for this procedures are as follows:--- Tools
wire cutters.
wire crimp/stripper.
bludgeoning device (hammer preferred).
some socket wrenches.---------
Step 1:remove foot rest under the pedals
step 2: find round brake linkage that glides next to a Flat rod. should be about diameter of the copper pipe, goes up.
step 3: cut 2 lentghs of copper pipe the width of a Hose clamp. about a 1/2 inch long.
step 4: smash 1 of the pieces of copper pipe flat.
step 5: Pre-bend the hose clamp: get a 3 - 6" piece of copper pipe and tape it behind the Brake linkage rod, then get one of the hose clamps, wrap it around the copper pipe with adjusting nut to the right of the rod. Tighten till very firm and then Back it out...remove the prebending pipe you used, leaving the hose clamp on very (VERY) loose
step 6: install Switch...take 1 supplied adjusting nut that came on the switch, screw it on, followed by the round copper pipe that you cut followed by the 2nd adjusting nut. (the round copper pipe adds structural integrity to the switch so you dont crush the plasitc). Now take the smashed piece of pipe and tape it to the round copper pipe. This will be a spacer that goes against the Brake connecting rod. Slip it into Hose clamp and tighten. Make sure the electric connectors are pointing up. Snug it up but dont tighten it all the way...Yet.
step 7: take 1.5" of copper pipe and smash it flat, then bend it into an "L" mount the with the other Hose clamp o n the Flat bar that is next to the Brake connecting rod. The L should Press the actuator switch almost all the way in. Crank the hose clamp down, but dont strip the hose clamp.
step 8: pop trunk and remove carpet and that board to get to the brake light switches..probably have to pull 2 Fresh air hoses too.
step 9: Determine which of the 2 crappy brake light switches works best. Find the wires to the brake light switches pull one off, hop in driver seat and press pedal (make sure you can see the brake lights come on!). get a feel for when it comes on and then put the one back on and pull the other off. the one that works better is the Keeper.
step 10: on the front of the master cylinder are 2 plastic covers covering 2 holes. fish a length of wire down the hole, should drop by the brake pedal. crimp and wire female blades to the switch. in trunk, run wire safely to the pulled brake light switch wire and crimp and wire male blades to New installed wire and plugin to pulled brake light switch wire.
step 11: back in drivers seat and press brake pedal to see if brake lights come on sooner. Adjust mechanical switch on brake linkage rod. Tighten up mechanical switch. Dont crush it...it may spin around a little if you give it the old 3 grunt twist...but otherwise it should not move.
----------- Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 30, 2010

Click on the link below and follow the steps in the forum to fix your 1988 Porsche Carrera brake light switch problem

http://forums.pelicanparts.com/porsche-911-technical-forum/281685-mechanical-brake-light-switch-installed.html

Posted on Aug 29, 2010

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The switch is located near the top of the brake pedal "arm" under the dash. it turns in or out depending on whether it is too sensitive or not sensitive enough.

Posted on Aug 29, 2010

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