 Master Cylinder switch? |
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| Danny_Ocean |
 Oct 21 2007, 10:57 AM
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#1
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Member  Group: Members Posts: 170 Joined: 27-June 07 From: Fort Lauderdale, FL Member No.: 7,846 Region Association: South East States  |
I removed my belly-pan for the first time and took a close look at the master cylinder. There is what appears to be a brake light switch screwed in to the left (driver's) side that has one electrical connection. Hanging next to the switch, dis-connected, are two wires, which look like they would plug in to this switch...but there's only one spade... ???
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| ejm |
Oct 21 2007, 01:58 PM
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#2
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I can see the light at the end of the tunnel Group: Members Posts: 2,691 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
That switch trips the brake warning light if one circuit of the master cylinder fails. The early/original switches had a ground wire, the later switch is self grounding thru the master. The brown with white marker is the wire you want hooked to the single terminal on the switch. The switch also has a reset button you'll need to push in after bleeding the brakes to put the light out.
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| Danny_Ocean |
Oct 21 2007, 02:20 PM
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#3
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Member Group: Members Posts: 170 Joined: 27-June 07 From: Fort Lauderdale, FL Member No.: 7,846 Region Association: South East States |
Great info. Thanks!
QUOTE(ejm @ Oct 21 2007, 03:58 PM)  That switch trips the brake warning light if one circuit of the master cylinder fails. The early/original switches had a ground wire, the later switch is self grounding thru the master. The brown with white marker is the wire you want hooked to the single terminal on the switch. The switch also has a reset button you'll need to push in after bleeding the brakes to put the light out. |
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| Dave_Darling |
Oct 21 2007, 08:40 PM
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#4
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The brake light switch is located on the pedal cluster, not on the master cylinder.
--DD |
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| Danny_Ocean |
Oct 21 2007, 11:43 PM
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#5
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Member Group: Members Posts: 170 Joined: 27-June 07 From: Fort Lauderdale, FL Member No.: 7,846 Region Association: South East States |
Thanks, I realize this. The switch in the M/C "appears to be" a brake light switch. I didn't know how else to describe it.
QUOTE(Dave_Darling @ Oct 21 2007, 10:40 PM) The brake light switch is located on the pedal cluster, not on the master cylinder. --DD |
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| McMark |
Oct 22 2007, 01:20 AM
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#6
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
It's a brake failure warning switch thingy. Duh! (IMG:style_emoticons/default/av-943.gif)
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