|11-21-2014 01:08 AM|
I have not yet replaced the brake master cylinder in my 2005 Focus. The issue persists, but it is a very seldom occurrence; I'd say once every 6 months. Back when I originally replied to this post, I lived in LA and would apply constant force to the brake pedal as I idled forward in traffic every day. The sinking pedal was very common back then, maybe once a week. But since moving to an area with no traffic, it rarely happens since I don't ride the brakes so much.
I still think sailor's original diagnosis is correct. An internal piston seal is occasionally allowing fluid by, so for the length of that stroke only the second piston and therefore two brakes are functional and it takes much more stroke to stop the car. That is standard master cylinder fail safe design.
Despite the infrequency, I plan to change the master cylinder out soon. The only reason I haven't is because my Chilton's repair manual made mention of a special Ford tool required to bleed the ABS-equipped Foci. Since then, I have acquired a digital Ford shop manual for the 2000-2005 Focus, and it makes no mention of this special tool....... I extracted the relevant portions from the shop manual regarding master cylinder testing, replacement, and brake bleeding in case it would help anyone, but I don't see a way to attach files.... is there a way on this forum?
Otherwise, if you come across this thread and you want some information from the shop manual regarding this issue, PM me an email address and I'll send you what I have.
|11-19-2014 05:14 PM|
|sailor||Moved to Brakes, Suspension & Chassis|
|11-19-2014 05:10 PM|
If either of you decide to replace your master cylinder, do yourself a favor and bench bleed it before installation. There are kits for that with little threaded plastic plugs. If you install the cylinder dry, fill it up, and bleed everything from the brakes, it takes longer and you waste fluid.
|11-19-2014 10:06 AM|
|suznal||I haven't done repairs as of yet. I haven't really driven the car in a while, but when I have this problem has not presented itself.|
|11-18-2014 12:19 AM|
i have the same problem with my isuzu fuego. so did the replacement of the master cylinder fix it? i need to know. tnx
|10-20-2012 04:16 AM|
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 12:23 PM|
|09-21-2012 07:10 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 12:33 PM|
|VEGAS||i would go with the "master cylinder" as the target. I had same issue and it was that..|
|09-20-2012 01:35 AM|
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.
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