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#1
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Brake pressure switch question
1982 911 sc
Both My brake lights have recently stopped working. The brake light on the dash has also lighted up and won't go off. When I check for voltage I don't appear to have any voltage coming out of the switch ( have only tested the front most switch so far). Will the system work with one bad pressure switch or must both be operational for the system to work properly? Thanks.
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone) |
#2
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Quote:
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David I hope to arrive to my death, late, in love, and a little drunk! Just because I don't care doesn't mean I don't understand... Homer Simpson "That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n Some cause happiness wherever they go; others whenever they go. CHAOS, PANIC, AND DISORDER my work here is done... Live without pretending, Love without depending, Listen without defending, Speak without offending |
#3
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I guess you don't know until the second one fails. Have checked the fuses and continuity. Ordered a couple of switches. I suppose everything has a shelf life. Thanks Dave.
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone) |
#4
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changed both switches...system operating...
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone) |
#5
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Those switches go bad all the time. I've gone through at least 4 sets. I wonder if track use and repeated high pressure cycles in the braking system has anything to do with it?
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Chris M 1985 911 Carrera with a couple cosmetic only mods 2006 E90 330i 1999 E46 328i |
#6
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i saw a mod for adding in a mechanical switch...seems pretty easy to do...may add it in...
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone) |
#7
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I suspect it's running the entire brake light current through the switches and that is what is frying them. Even two in parallel can't take it. I've replaced several sets myself.
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Jeff S '14 991.1 Carrera S Coupe '13 958 Cayenne GTS '11 997.2 Carrera S Cab '09 987.2 Cayman S '12 Audi TT-RS '05.5 Audi S4 '20 GMC Tow Beast '03 986 Boxster Base (kid #3) |
#8
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They work in tandem. If one fails the dash light should go on. In addition to the brake lights they are set up to light the dash when one brake fluid loop develops less pressure that the other. Clever design, Poor build of the pressure switch.
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http://vimeo.com/29896988 “Those that can make you believe in absurdities can make you commit atrocities.” Voltaire. "There is grandeur in this view of life...." Darwin. The mountains are calling and I must go. “The earth has music for those who listen” Shakespeare. You Matter. (Until you multiply yourself times the speed of light squared. Then you Energy) “We’ve got lots of theories, we just don’t have the evidence’. |
#9
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For the moment they are functional. Dash light has gone out. Brake lights working. Let's see how long the switches last.
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone) |
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