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tailwind22 tailwind22 is offline
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Join Date: Jun 2012
Location: Moses Lake, WA
Posts: 754
Originally Posted by JFairman View Post
An '87 has two brake light switches on the master cylinder. They are switched by hydraulic pressure as you press the brake pedal down. I don't know why they have two switches, I guess one is a backup to the other if one stops working.
I replaced them both because the brake lights wouldn't come on with light brake pedal pressure when slowing down easily around town.

I bought the replacements from a Porsche dealer because that was the lowest price on them I found.
They are not fun to replace... kind of hard to get at and stuff has to be moved out of the way from what I remember.
Then you have to bleed the brakes to get any possible air bubbles out of the master cylinder.
Yes, the vent hoses are not going to be fun to remove as you state above but I do believe that the switches are the culprit. I will get them ordered.
87 930 M505
89 Porsche 911 Targa, 25,000 miles, bone stock
73 Porsche 911 RSR Tribute awaiting Rothsport motor
76 Porsche 914 Raby motor
70 Porsche 916-6
Old 04-11-2014, 06:30 AM
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