need help and advice
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
DIODE RESISTOR ELEMENT/CIRCUIT 531
Disconnect fluid level switch.
Connect jumper wire from Circuit 531 (DG/Y) to known chassis ground.
Observe red BRAKE light.
Red BRAKE light is OFF
REPAIR open Circuit 977 (P/W), 531 (DG/Y) or open diode/resistor element. REPEAT System Pre-Check.
Red BRAKE light is ON
LEAVE fluid level switch disconnected.
Connect jumper wire from Circuit 531 (DG/Y) to Circuit 512 (T/LG).
Turn key to START position.
Observe red BRAKE light.
Red BRAKE light turns ON when key in START position
Master Cylinder fluid level switch is defective. REFER to «Section 06-06» for fluid level switch removal and installation procedures. REPEAT System Pre-Check.
Red BRAKE light remains OFF when key in START position
Open in Circuit 512 (T/LG) or defective ignition switch. REPAIR/REPLACE and REPEAT System Pre-Check.
/
Disconnect fluid level switch.
Connect jumper wire from Circuit 531 (DG/Y) to known chassis ground.
Observe red BRAKE light.
Red BRAKE light is OFF
REPAIR open Circuit 977 (P/W), 531 (DG/Y) or open diode/resistor element. REPEAT System Pre-Check.
Red BRAKE light is ON
LEAVE fluid level switch disconnected.
Connect jumper wire from Circuit 531 (DG/Y) to Circuit 512 (T/LG).
Turn key to START position.
Observe red BRAKE light.
Red BRAKE light turns ON when key in START position
Master Cylinder fluid level switch is defective. REFER to «Section 06-06» for fluid level switch removal and installation procedures. REPEAT System Pre-Check.
Red BRAKE light remains OFF when key in START position
Open in Circuit 512 (T/LG) or defective ignition switch. REPAIR/REPLACE and REPEAT System Pre-Check.
/
Thread Starter
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Junior User
Joined: Jul 2004
Posts: 73
Likes: 0
From: NH
Originally Posted by subford
Red BRAKE light turns ON when key in START position
Master Cylinder fluid level switch is defective. REFER to «Section 06-06» for fluid level switch removal and installation procedures. REPEAT System Pre-Check.
/
Master Cylinder fluid level switch is defective. REFER to «Section 06-06» for fluid level switch removal and installation procedures. REPEAT System Pre-Check.
/
That was the problem I think test result is that the fluid level switch is bad. can't find the part but they told me at Napa they thought Ford was recalling this piece since it is part of the cruise system and I called ford and the service dept said this would be replaced for free via the recall I will update the results after item is replaced thanks for all the help!!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Well no this is not the switch for the cruise system, that is a pressure deactivation switch that the recall is for.
Your pressure deactivation switch is near LH front rail, below drivers floor pan.
The cruise system recall has nothing to do with the fluid level switch.
Your pressure deactivation switch is near LH front rail, below drivers floor pan.
The cruise system recall has nothing to do with the fluid level switch.
Elder User
Joined: May 2007
Posts: 544
Likes: 1
Not to steal the thread, but I just got done testing mine and the switch is defective according to the test. After calling around the only way to get a new one is by buying a new (or reman) master cylinder in my case.
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