Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - Reply to Topic
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > Brakes, Suspension & Body Chassis > Brake pedal goes to the floor sometimes

Brakes, Suspension & Body Chassis The place to go for answers on brakes, suspension, camber, alignment and more.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Thread: Brake pedal goes to the floor sometimes Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
12-02-2014 08:28 PM
crystalnh
Would love to see the info you have!

doing a master tomorrow for my daughter. If you get this and could send me what you have I would greatly appreciate it. crystalnh4492@yahoo.com
11-21-2014 01:08 AM
focusgg 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
Highball116 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.

Toby
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
stphn
hi

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
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 12:23 PM
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 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..
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 09:56 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat