 Master Cylinder Wiring Question, New 19mm unit only has one connection instead of two |
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| Nozzle |
 Aug 11 2009, 09:24 AM
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#1
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Member  Group: Members Posts: 158 Joined: 6-November 08 From: Lexington Park, Maryland Member No.: 9,725 Region Association: MidAtlantic Region  |
As part of a stock brake overhaul, I'm replacing my old rusted 914/4 master cylinder with a new 19mm unit. Weird thing is the new sending unit only has one electrical connection instead of the two from the original one. Inside the rubber connector boot there are two brown wires, one with a white stripe and one without. Wires were disconnected by a PO long ago judging by the outstanding rust build-up on the old sending unit terminals.
Questions: 1. Which wire do I connect; the one with the stripe or without? 2. What do I lose if I run with only one sending unit wire connected? Many thanks in advance. |
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| neil30076 |
Aug 11 2009, 09:40 AM
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#2
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Recovering dismantler! Group: Members Posts: 397 Joined: 12-September 06 From: San Diego ( RB) CA Member No.: 6,826 Region Association: Southwest Region |
QUOTE(Nozzle @ Aug 11 2009, 08:24 AM)  As part of a stock brake overhaul, I'm replacing my old rusted 914/4 master cylinder with a new 19mm unit. Weird thing is the new sending unit only has one electrical connection instead of the two from the original one. Inside the rubber connector boot there are two brown wires, one with a white stripe and one without. Wires were disconnected by a PO long ago judging by the outstanding rust build-up on the old sending unit terminals. Questions: 1. Which wire do I connect; the one with the stripe or without? 2. What do I lose if I run with only one sending unit wire connected? Many thanks in advance. There are 2 wires because the original switch required a ground connection. The new switch grounds through the body of the switch to the cylinder. Connect the brown/white, leave the brown off ( its the ground wire) and it will work exactly as it should. |
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| tat2dphreak |
Aug 11 2009, 09:49 AM
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#3
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region  |
QUOTE There are 2 wires because the original switch required a ground connection. The new switch grounds through the body of the switch to the cylinder. Connect the brown/white, leave the brown off ( its the ground wire) and it will work exactly as it should. (IMG:style_emoticons/default/agree.gif) it's the brake malfunction light in the dash, |
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| Nozzle |
Aug 11 2009, 12:08 PM
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#4
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Member Group: Members Posts: 158 Joined: 6-November 08 From: Lexington Park, Maryland Member No.: 9,725 Region Association: MidAtlantic Region |
Exactly what I needed to know. Thanks much to you both.
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| jimwhite99 |
Sep 2 2009, 04:41 PM
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#5
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Newbie Group: Members Posts: 1 Joined: 28-June 09 From: Orlando, FL Member No.: 10,514 Region Association: None |
Exactly what I needed to know too! Thanks guys.
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