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Thread: Brake pedal goes to the floor sometimes Reply to Thread
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Topic Review (Newest First)
10-20-2012 03:16 AM
amc49 You could easily be getting ready to crash your car into others at a traffic light, worrying about having to have car with no downtime is definitely misplaced priority..........getting car fixed fast is more important.

Change master cylinder.
10-19-2012 11:23 AM
suznal
Quote:
Originally Posted by focusgg View Post

Focusfanatic Grumpy said it best, in my opinion:

"If you can get the pedal hard by letting the pedal up and then quickly applying the brakes again, it ain't air in the system, but assuming there are no external fluid leaks, you've probably got the master cylinder bypassing fluid (fluid leaks past a piston seal). Usually will be noticed when applying the brakes for a relatively long time, and the pedal will slowly drop towards the floor. It IS NOT normal. Get to a dealer.......the warranty should cover it. It is not normal wear and tear on the brakes."

However I would like to avoid the dealer if possible. Does anybody have any experience with replacing the master cylinder on an '05 Focus? Is a pressure bleeder or specialty dealer tool really necessary?

I actually don't mind spending the money on a pressure bleeder since I'll probably come out ahead of a dealer repair bill anyways, I'm just wondering.
OK, makes sense - I will proceed with the assumption that the brake master cylinder is the culprit.

Quote:
Originally Posted by SoCalFan View Post
On my 2000 with ABS the instructions are to use special Ford test equipment when bleeding the system if air has entered the ABS unit. Since that was not the case, I only had to be sure to bench bleed the brake master cylinder before installation. My fluid was very contaminated so I used this opportunity to dump all of it.
I will do a liitle more digging, just to make sure that i have everything i need - too bad Ford doesn't offer up this information freely to it's customers. I just can't have anything go wrong - no car means no work!
09-21-2012 06:10 PM
SoCalFan On my 2000 with ABS the instructions are to use special Ford test equipment when bleeding the system if air has entered the ABS unit. Since that was not the case, I only had to be sure to bench bleed the brake master cylinder before installation. My fluid was very contaminated so I used this opportunity to dump all of it.
09-20-2012 11:33 AM
VEGAS i would go with the "master cylinder" as the target. I had same issue and it was that..
09-20-2012 12:35 AM
focusgg So, I have searched the focusfanatics forums very thoroughly, and I feel pretty confident even without inspection that the problem lies within the master cylinder.

Focusfanatic Grumpy said it best, in my opinion:

"If you can get the pedal hard by letting the pedal up and then quickly applying the brakes again, it ain't air in the system, but assuming there are no external fluid leaks, you've probably got the master cylinder bypassing fluid (fluid leaks past a piston seal). Usually will be noticed when applying the brakes for a relatively long time, and the pedal will slowly drop towards the floor. It IS NOT normal. Get to a dealer.......the warranty should cover it. It is not normal wear and tear on the brakes."

However I would like to avoid the dealer if possible. Does anybody have any experience with replacing the master cylinder on an '05 Focus? Is a pressure bleeder or specialty dealer tool really necessary?

I actually don't mind spending the money on a pressure bleeder since I'll probably come out ahead of a dealer repair bill anyways, I'm just wondering.
09-13-2012 12:02 PM
cbdallas It's probably a brake flushing tool that forces brake fluid into the braking system in order to push air through the abs unit and out the wheel cylinders. If air gets trapped in the ABS unit, it likely won't work, and will probably kick on the ABS fault light.
09-13-2012 11:57 AM
suznal I will definately let you know - unfortunately I am having some problems.

As my car has ABS, the Hanes manual says that "special equipment" is needed to bleed the system after the master cylinder is replaced. i have posted a thread asking fo assistance in determining what this equipment is, but no one has responded.
Since I don't have a spare vehicle, I cannot risk undertaking this project unless I know that i have everything i need before I start.

Any ideas as to what equipment i need???
09-11-2012 12:27 PM
sailor Agreed focusgg, brake fluid above the piston would prove the issue once the master is pulled away from the booster for inspection.

interesting that he can't duplicate the issue in the driveway.....
09-10-2012 09:37 PM
focusgg
Ditto

I have the exact same problem Suznal is describing, and it occurs under the exact same circumstances.

Suznal - I would be interested in hearing if replacing the master cylinder solves the problem and if you found an other evidence while replacing it that would suggest it was definitely the master cylinder, e.g. visible leaks.
09-10-2012 01:48 PM
suznal Steady test both car running and off.
I did bleed the lines thinking there might be air - no air found in the lines.

Guess I'll get the Hanes manual out tonite and get ready to start calling around for price and availability.
Thanks for the help!
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