Jump to content
Madcowz

Defender 130 - Brakes well but pedal slowly sinks to the floor

Recommended Posts

Hi,

I've recently been driving a new (2010) 130 which is lovely compared to my rattly One Ten but the brakes are odd and I'm looking for advice.

The servo works fine and it brakes really well with a firm pedal (not as firm as mine but I have just replaced the brake system very recently except servo and pump) but if you brake to a stop and keep your foot pressing on the pedal, it slowly drops all the way to the floor. It is slow and not a sudden drop but it does sink all the way.

Both their same aged vehicles do exactly the same. Their garage have checked it over, checked for leaks, checked brake fluid and checked the master cylinder for leaks (not sure how they did that) and then asked one of their "Ford time serviced mechanics" who said that its a transit engine and components, and that transits do exactly the same and release brake pressure after stopping and "they all do that".

As anyone who has seen my previous posts on this forum knows, I'm no expert but this doesn't make sense to me.

Share this post


Link to post
Share on other sites

I've had two Disco 3's a few years ago that both used to do the same, never really took much notice of it until one had the brake servo recall, then I became a bit more aware of it, probably because of the potential brake fade issue the recall addressed.

My 2004 90 does it too, albeit a little more slowly, I can only assume there must be a little bit of by-pass leakage in the master cylinder, or something similar going on with the ABS module.

I've got to keep a fair amount of pressure on the pedal for it to occur, probably quite a bit more than I'd use to apply the brakes normally.

Share this post


Link to post
Share on other sites

Cheers.

So we’re thinking a MC (or ABS)  leak rather than expected behaviour. 

Share this post


Link to post
Share on other sites

Oh ABS...  Sorry never think of that with a Defender.  Hopefully not, as that is not cheap.

And, no, that should not happen.

Share this post


Link to post
Share on other sites
20 minutes ago, Red90 said:

Oh ABS...  Sorry never think of that with a Defender.  Hopefully not, as that is not cheap.

And, no, that should not happen.

I didn’t even know ABS was such a thing on Defenders until recently when I was watching a video on replacing the swivel bearings and it was mentioned. 

Share this post


Link to post
Share on other sites

My 2012 Transit does this, has done from new and 180k further in it still does it. Never an issue on braking efficiency and I'm pretty sure it's mentioned in the drivers handbook. 

Share this post


Link to post
Share on other sites

quite a few newer vehicles do this. if the performance of the servo is not degrading then dont worry. ie if you come off and brake again and it does it sharply in a short space of time then dont worry. 

Share this post


Link to post
Share on other sites

My 300 Tdi Disco did exactly this until I fixed the oil leak from the vacuum pump - then it stopped altogether!

 

Edited by Paddy_SP

Share this post


Link to post
Share on other sites

Thanks for replies.

So some say it's a fault and others say it is normal behaviour and ok.

 

Share this post


Link to post
Share on other sites

Never known any braking system to do this and be "OK"

Normally the recouperating seal in the master cylinder not sealing properly.

It closes off the feed from the reservoir when braking, but if failing, will allow some pressure (and fluid) to leak back into the reservoir. 

Share this post


Link to post
Share on other sites
1 hour ago, smallfry said:

Never known any braking system to do this and be "OK"

Normally the recouperating seal in the master cylinder not sealing properly.

It closes off the feed from the reservoir when braking, but if failing, will allow some pressure (and fluid) to leak back into the reservoir. 

Agreed, I don’t buy it that a hydraulic brake system is designed to ‘relieve’ pressure in this way. It defeats the principle upon which the system is designed.

Something’s not quite right with this. I’d investigate further.

Share this post


Link to post
Share on other sites

I too had heard a lot of modern stuff does this, and it's normal. In fact I'm fairly sure I've heard D3's do it as standard.

Share this post


Link to post
Share on other sites

Both my 2012 merc sprinters to this as does my D2.

 

never really bothered me as it seems to be an abs thing, if my 90 started doing it then I would be worried.

Share this post


Link to post
Share on other sites

Seriously, this means your ABS module or master cylinder is faulty.  It is not normal nor acceptable.  Sometimes you can fix it by forcing the ABS to activate.  The valve cycling sometimes lets the carp out of the valves and they can seat properly again.

Share this post


Link to post
Share on other sites

The short answer here is that they all fade if you keep pressure on the pedal. Don't keep hard pressure on the pedal and it won't fade.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy