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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36069
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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2000 Ford Taurus: master cylinder..the brakes went all the way..pumped

Resolved Question:

We had the master cylinder on our 2000 Ford Taurus replaced about three weeks ago. Today while my daughter was trying to stop at a red light the brakes went all the way to the floor, she pumped them and they went to the floor again. She only avoided an accident by making a u-turn over the median and onto the sidewalk on the other side of the street. Two police officers tried her brakes and confirmed that they went all the way to the floor. However, by the time the tow truck arrived 45 minutes later the drive reported that the brakes were fine. Indeed at the garage where we had the original work done they reported the same. The officers reported and showed me brake fluid on the reservoir, which was nearly full, but at the garage there was no brake fluid outside the reservoir. There was no brake fluid on any of the 4 wheels according to the garage. After calling the vendor who provided the master cylinder the garage checked some other stuff and now says it was a leaky wheel cylinder on the left rear. Why would all four brakes go if only one wheel cylinder was bad. I've been told that the master cylinder has a valve in it that makes it so that should there be a problem in the rear the front brakes (the ones that supposedly do 70% of the braking) will still work. Will replacing one wheel cylinder solve the problem are are we still at risk for brake failure?
Submitted: 8 years ago.
Category: Ford
Expert:  Ron replied 8 years ago.



Thank you for asking your question on JustAnswer.


If the wheel cylinder was leaking, you would not have had a full master cylinder. The problem you are describing is likely a defective master cylinder. You are right, the master cylinder is divided into front and rears and would still stop the car, regardless if the rear was leaking. The shop is covering there butts (CYA) but you need a new master cylinder or they failed to get the system bleed the first time.

Customer: replied 8 years ago.
So it is possible that with a defective master cylinder the brakes could be working perfectly fine for a while then fail completely, then work okay again?
Expert:  Ron replied 8 years ago.



Thank you for asking your question on JustAnswer.


Yes it is but it is also possiable there was an air pocket as well. But a leak would have left low fluid.


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