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Old 02-22-2015, 09:33 AM   #1
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Brake master cylinder low fluid sensor

does anyone know if the low sensor on the brake master cylinder can be replaced? and if so where to get it and the part number?
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Old 02-23-2015, 03:38 PM   #2
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I don't think that our master cylinders have a low level sensor, if you mean one to monitor fluid level.

The switch on the M C is a pressure deferential switch that will light a dash light if a leak develops in the front or back brake system(s) causing a pressure loss.

I do not know a part number for that switch.
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Old 03-01-2015, 08:15 PM   #3
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The pressure deferential switch is replaceable. Easy to do and you won't lose any fluid in the exchange.

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Old 03-02-2015, 05:28 AM   #4
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beagle, where is the pressure deferential switch?
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Old 03-02-2015, 06:00 PM   #5
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It is white nylon screw in switch on the side of the master cylinder, between the tubing ports. Look it up on google images or take it to NAPA and you should be able to find one. Cost is $13 to $28 when I checked. I just threw out a broken one or I would send photo.

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Old 03-02-2015, 06:03 PM   #6
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beagle, if that were to be bad, do you think that would cause my cruise control not to work?
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Old 03-03-2015, 07:27 PM   #7
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Do your brakes work ok? Any difference in stopping power or difference in feel of the pedal? If there is an imbalance between the front and back section of the M/C, the differential switch would indicate that to you. You should be able to feel that by applying heavy pedal pressure and holding it, noting whether the pedal fades. Cruise control malfunction, got me on that one, but my guess is that they are not related.
In the past the differential switches could be reset. Not sure on this one though. It is nothing more than a toggle switch. If you screw it out, you can try to reposition it to the neutral position. They only trip when the pressure changes between the two chambers. Like when the brake are being bleed or when one of the chambers has an imbalance in relation to the other chamber. Brake Systems - the pressure differential switch

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