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Hard and fast technical info about the park brake?
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colinm
Joined: 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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 Tue Oct 07 2008 8:01am |
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simon
Joined: 11 Jan 2005
Location: ...
Posts: 15015
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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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| Tue Oct 07 2008 8:13am |
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colinm
Joined: 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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| Tue Oct 07 2008 9:05am |
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AndrewW
Joined: 06 Aug 2007
Location: Saddleworth
Posts: 1423
 
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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 PsychoŽ shower-scream.
Are there two different types of screaming malfunction? 06 TDV6 SE Tonga Green
Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)˛), Origin b2 (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle)
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| Tue Oct 07 2008 9:18am |
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norto
Joined: 10 Apr 2006
Location: batemans bay
Posts: 1117
 
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Mine has started to squeal again 
Anyone know how to adjust it Peter
"Global Warming" The religion of the left
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| Tue Oct 07 2008 9:34am |
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colinm
Joined: 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 PsychoŽ 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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| Tue Oct 07 2008 9:54am |
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wiggs
Joined: 03 Sep 2006
Location: back in Manchester
Posts: 2557
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Pm me an email address and i will forward you all the info you need .  Help get this page up the rankings please
http://www.sunnybeachinterior.co.uk/
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| Tue Oct 07 2008 10:44am |
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MARKW
Joined: 29 Aug 2008
Location: Wiltshire
Posts: 84
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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. Where's the naughty corner?
HONI SOIT QUI MALY PENSE
Disco TDV6
Def 200TDI
Rover 25
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| Tue Oct 07 2008 11:28am |
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WaznotWas
Joined: 11 Jun 2008
Location: Bucks
Posts: 149
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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...... If you make a mistake, enjoy the experience!!
07 HSE Z Silver, black leather, steps, d/lights, Black RRS badges, anthracite wheels, front and rear disco3 badges
99 Green 300 TDI ES Premium, tired but still iving the life!
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| Tue Oct 07 2008 1:20pm |
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norto
Joined: 10 Apr 2006
Location: batemans bay
Posts: 1117
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Wiggs Peter
"Global Warming" The religion of the left
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| Wed Oct 08 2008 8:25am |
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AndrewW
Joined: 06 Aug 2007
Location: Saddleworth
Posts: 1423
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good info. 06 TDV6 SE Tonga Green
Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)˛), Origin b2 (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle)
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| Wed Oct 08 2008 8:53am |
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Martin
Site Admin and Owner
Joined: 06 Nov 2004
Location: Shoreham-by-Sea
Posts: 5284
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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. DISCO3 Goodies in the Shop: Stickers, Polo Shirts, Fleeces and More! | D3 Parts For Sale
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| Wed Oct 08 2008 9:12am |
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colinm
Joined: 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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| Wed Oct 08 2008 9:15am |
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AndrewW
Joined: 06 Aug 2007
Location: Saddleworth
Posts: 1423
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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 06 TDV6 SE Tonga Green
Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)˛), Origin b2 (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle)
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| Wed Oct 08 2008 9:31am |
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colinm
Joined: 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 Wed Oct 08 2008 1:53pm; edited 1 time in total
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| Wed Oct 08 2008 12:55pm |
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