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99 sable wagon brakes

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pinhead01
New User

Jun 18, 2011, 9:50 AM

Post #1 of 5 (1508 views)
post icon 99 sable wagon brakes Sign In
I have a 99 Mercury Sable Station Wagon. When you apply the brakes with steady pressure, brake pedal stays up. Reduce pressure just a bit and pedal goes slowly to the floor. What causes this? A sensor, pressure valve or what?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 18, 2011, 12:43 PM

Post #2 of 5 (1496 views)
Re: 99 sable wagon brakes Sign In
Sounds like the ABS is triggering in error.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



pinhead01
New User

Jun 20, 2011, 7:25 PM

Post #3 of 5 (1479 views)
Re: 99 sable wagon brakes Sign In
So I checked the ABS and sensors and they are all fine but the brakes are still doing the same do you have any other ideas? Have you ever heard or seen this happen to anyone?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 20, 2011, 11:45 PM

Post #4 of 5 (1477 views)
Re: 99 sable wagon brakes Sign In
I've seen more than one master cylinder do that. Hit firmly it hold and lightly pedal sinks. Usually that will trigger a warning light if pedal sinks enough,

T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 21, 2011, 2:57 AM

Post #5 of 5 (1470 views)
Re: 99 sable wagon brakes Sign In
There is no way that you could have checked the sensors and ruled them out. You would need a professional scan tool with the ability to record frame by frame sensor data. This is not something that you are equipped to diagnose if it is an ABS problem.

Reading your question again, it could very possibly be a bypassing master as Tom suggested.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jun 21, 2011, 2:59 AM)





 
 
 






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