Master Cylinder "Fluid Level Low"

I have a 2005 Escape Hybrid AWD, purchased in November of 2004.
The brake light came on about a month ago, along with a message that the brake fluid level was low. It was a little low, about mid way between
marks. I added some, but the light didn't go out.
I took it to the dealer, who said the brakes needed to be replaced (116,000 miles). I had front and rear done.
Today, I took it in for the 120,000 mile service, and the tech noted that the brake fluid level message was on, which I hadn't seen since the brake job.
"Retrieved code c1327 indicating brake fluid low. Performed pin point test L1-L3, pinpoint L3 checked resistance at the brake fluid switch c124 tn-lg and vt-ye. The resistance is greater than 1200 ohms (actual is at 4.5 Mega ohms) out of spec. Rec replacing the master cylinder."
$757 for a master cylinder because the fluid level switch is embedded. It only has two wires. If I disconnect the switch, or short out the pins, could I eliminate this error message? I would even wire in a 1200 ohm resistor, if that would make the computer happy. I can check the fluid level like I have on other cars without a sensor.
I see lots of web complaints about this sensor in other Fords, where it is replaceable separate from the master cylinder.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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snipped-for-privacy@96.usenet.us.com wrote:

I'm getting closer I found a diagram of the switch.
Switch c124 has --- 1.2K -+- 1.5 K -+- 1.5K -+-- | -- x -- | -- x -- | What that ASCII art is supposed to suggest is that there is always 1.2K in the circuit. And two 1.5K resistors that might be bypassed by switches. 0 ohms == bad 1.2 K == both switches closed 2.7 K == one closed, one open 4.2 K == both open infinite == bad
I don't have the test procedure, so I don't know which level is desired.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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wrote:

I printed-to-PDF the Pinpoint Test G for a 2002 Escape (from my shop CD), and emailed it to your address above. If that is not a valid one, let me know and we can do it some other way. It's a 21 page procedure, but the entire file is only 93K.
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SC Tom


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Thanks for that. This is a "protected" address that only accepts mail with a subject that matches the Usenet article. I sent you my normal email address.
I had pondered buying the proper manual on DVD, but over $100 seems a bit steep. I have printed manuals for my other vehicles, but I think the most expensive was $75.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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wrote:

That's not my real one, either ;-) I'd just as soon not post it on usenet, nor would I want anyone else to. I tried again to your posted email here and used the same subject line as here (minus the RE: ). Will that maybe work?
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SC Tom


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That worked for me, but I don't see yours... How about dold at rahul dot net ?
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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Unfortunately, now that I have that, I see that the 2002 is a simple open/closed switch. The test is "less than 5 ohms" and "more than 10,000 ohms" as the fluid level is triggered.
Mine is not that way.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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snipped-for-privacy@96.usenet.us.com wrote:

The service writer printed the relevant troubleshooting pages. It does not speak of the resistance readings, just a diagnostic routine that doesn't match the true results of an open circuit.
I know there are only a few possible values, made up of three resistors.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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snipped-for-privacy@96.usenet.us.com wrote:

Radio Shack didn't have a 1.2K ohm resistor, but I bought a pack of five 1.5K for $1.19. Shoved one of those into the connector. No messages, no warning lights.
Now, I have to pay myself $1 every time I remember to check the brake fluid level.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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wrote:

And after checking it 757 times, you'll have saved up enough for that new master cylinder :-)
Glad it worked for you. I guess that light (and some others) are for the people who have absolutely no idea how to maintain a vehicle. I would go your route also if I had a similar instance. I already know when and how to check my brake fluid and coolant- I certainly don't need a light to tell me.
--
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The master cylinder is translucent. All I have to do is lean against the front bumper hard enough to slosh the fluid a little to get visibility.
That's assuming that I ever open the hood, a less frequent event than it was on cars past.
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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

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