colinm
Member Since: 06 Oct 2008
Location: Derbyshire
Posts: 47
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| Hard and fast technical info about the park brake? |
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Although there is a lot of information about people having problems with this there seems to be a lack of detailed technical info about the system. Searching the web does not come up with any pictures of the servo for example. About the most useful thing I have found is this youtube clip:-
http://uk.youtube.com/watch?v=fcV6vCnib9o
Posted by a LR technician and in the comments he says "Anyone with a discovery 3 has more than likely experienced problems with the electronic park brake such as a loud squeeling noise from the rear when the switch is pulled. " - just what we all want to hear 
Also, a bit later on he says "The fault was in the actuator itself, the gears had sheared and it wouldn't drive to the latch position. I work at a landy dealer in south wales. "
So, at least we have it on reasonable authority that there is a latch position for the servo but not much else!
The questions I have are:-
a) Is the servo the same as the one used on the Jaguars? and do they have a similar proportion of failures? If not, why not?
b) Is there really a slipping clutch in the servo? it would seem to me that limiting the forces electronically (i.e controlling the servo motor drive current) would be an easier way to do this. If there is no clutch in the servo then are the screaming noises always the servo gears skipping? If so does this not mean the servo gears need replacing whenever a servo screams as they can hardly be designed to skip without damage.
c) Does adjusting the linkage to overcome screaming simply move the servo operating range to a bit that still has some teeth and if so is this acceptable from a safety point of view?
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 7th Oct 2008 9:01 am |
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simon
Member Since: 11 Jan 2005
Location: Shropshire
Posts: 18296
  
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Your best bet for everything technical inc the EPB, is to subscribe to LR's GTR resource.
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| 7th Oct 2008 9:13 am |
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colinm
Member Since: 06 Oct 2008
Location: Derbyshire
Posts: 47
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Thanks Simon - I'll cough up my 8 quid when I have more time to search the documents for what I want (who said I was mean )
I must say that it's good that they allow Joe Public access to the workshop manuals. Most car manufacturers are a bit protective of that sort of information.
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| 7th Oct 2008 10:05 am |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2302
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That "screamer" sounds like two Jack Russells having an argument.
Mine and the only others I have heard was/were much more like an elongated Psycho® shower-scream.
Are there two different types of screaming malfunction? 2006 D3 finally swapped for a 2016 D4 Graphite in Graphite grey. No mods
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| 7th Oct 2008 10:18 am |
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norto
Member Since: 10 Apr 2006
Location: batemans bay
Posts: 1605
  
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Mine has started to squeal again 
Anyone know how to adjust it Pete
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| 7th Oct 2008 10:34 am |
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colinm
Member Since: 06 Oct 2008
Location: Derbyshire
Posts: 47
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AndrewW wrote:
That "screamer" sounds like two Jack Russells having an argument.
Mine and the only others I have heard was/were much more like an elongated Psycho® shower-scream.
Are there two different types of screaming malfunction?
Very good question! I can't help feeling that with a bit more info about the servo we could work this out - perhaps the type of scream is indicative of which stage in the servo gear-train is stripped (early stage = psycho; late stage = Jack Russells? )
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| 7th Oct 2008 10:54 am |
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wiggs
Member Since: 03 Sep 2006
Location: Manchester
Posts: 14368
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Pm me an email address and i will forward you all the info you need .  G4 Gone ...but not forgotten
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| 7th Oct 2008 11:44 am |
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MARKW
Member Since: 29 Aug 2008
Location: SW
Posts: 2390
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I recently went on an LRE day. In the shed where they did the maint was a row of about 1/2 dozen new EPB systems ready to fit. Sort of tells you that when LRE are holding that much in stock there must be a serious problem. HONI SOIT QUI MAL Y PENSE
They shall not grow old as those of us left grow old. Age shall not weary them, nor the years condem. At the going down of the sun, and in the morning WE WILL REMEMBER THEM
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| 7th Oct 2008 12:28 pm |
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WaznotWas
Member Since: 12 Jun 2008
Location: A long way from nowhere!
Posts: 1101
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Since playing at the LRO show my EPB has had intermittent terriers but I think they were tearing someone apart too
I arrived home last night and drove onto the drive. As I did my daughter and 2 mates turned up in the friends fiesta.
As they were getting out of it I pullled the switch and watched in the mirror as 3 terrified faces lept away from her car thinking it was going to blow up or something until they realised during the last dying screaming breaths of whatever the terriers were killing was coming from under the back of mine 
She thought I'd run over our cat
Well it amused me...... FORECAST FOR TONIGHT: things have happened out there!!!
The countryside is still OURS!!
Club 3 Musketeers, Club D3C, Club Midland CB, Club Vertex PMR, Club GNVP Sump Plate, Club GNVP Sliders, Club Uncle Ray Spare Wheel Protector, Club Smooth Steering Wheel, Club McStuckie
07 HSE Z Silver, black leather, Black RRS badges,
19" anthracite wheels - off, 18" Silver / General AT2's - on,
300 TDI Disco 1 - Sheltering the lawn!
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| 7th Oct 2008 2:20 pm |
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norto
Member Since: 10 Apr 2006
Location: batemans bay
Posts: 1605
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Wiggs Pete
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| 8th Oct 2008 9:25 am |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2302
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good info. 2006 D3 finally swapped for a 2016 D4 Graphite in Graphite grey. No mods
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| 8th Oct 2008 9:53 am |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18458
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This is an important issue affecting many D3s, so please share the information publicly (not just via PM) so everyone can benefit.
Thanks. 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
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| 8th Oct 2008 10:12 am |
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colinm
Member Since: 06 Oct 2008
Location: Derbyshire
Posts: 47
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Thanks Wiggs!
Its taking a while to sift through the info but it seems to me that the adjustment is critical and once in service relies on the operation of the self-adjusters to keep it within tolerance. Given how unreliable self-adjusters can be on manual handbrakes I wonder if many of the problems are down to slightly sticky self-adjusters.
As with so many things all it may require is a  with a hammer (and here I am  )
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| 8th Oct 2008 10:15 am |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2302
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Martin - in Adrian's defence the info is a huge data quantity, with possible copyright implications for him and for the site, and needed lots of to-and-fro comms to access the files.
Perhaps a high-level plan is needed to ensure correct, fair and wide access?
Andrew 2006 D3 finally swapped for a 2016 D4 Graphite in Graphite grey. No mods
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| 8th Oct 2008 10:31 am |
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colinm
Member Since: 06 Oct 2008
Location: Derbyshire
Posts: 47
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I'm quite enjoying getting my mind around the system (it's far too interesting to hide away under a car). There are about 30 pages of info and if it will help get around the copyright issues I'll have a go at summarising it and posting that on the site.
Last edited by colinm on 8th Oct 2008 2:53 pm. Edited 1 time in total
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| 8th Oct 2008 1:55 pm |
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