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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2289
  
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| Electronic Park Brake dissected |
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Well, not fully, yet.
Edit If you in a hurry, go to http://www.disco3.co.uk/gallery/albums/use...report.doc
See my Gallery, under EPB dissection
Having opened the vented and very well sealed top, the insides look pristine. The Yorkshire side of me tells me I can re-use / sell this if I don't wreck it, but I do want to pull it further to bits. So I stopped poking after the posted photos (then bust my camera  on Blencathra...).
Anyone want me to look at any particular bit? Edit We looked at it all''''
Still no idea what screams... no signs of heat or dust... EditWe do, now...
Let me know...
A 06 TDV6 2.7litre (!) SE Tonga Green
AT2s replaced with ATs, Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)�), Pogo Speed Camera locator (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle), Blackvue FFV
Last edited by AndrewW on Thu Jul 01 2010 1:37pm. Edited 1 time in total
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 Mon May 17 2010 6:24pm |
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MrH
Member Since: 08 Aug 2007
Location: Fooked if I know, and who cares anyway
Posts: 4128
  
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I believe the screaming it caused by the gears/coggs in the actuator jumping when the shoes in the drums are out of adjustment. So to see signs of damage you'd need to open up the gears in the actuator
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| Mon May 17 2010 6:41pm |
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dick dastardly
Member Since: 29 May 2007
Location: wiggleigh bottom
Posts: 1107
 
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This may be Küsters last stand.....
Sorry  There's one wheel on my wagon, but i'm still rollin' along, it's the cherokee, they're after me, but I'm singing a happy song
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| Mon May 17 2010 9:31pm |
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Wex
Member Since: 16 Apr 2007
Location: Knackeragua
Posts: 5170
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Have another here if you want it to take apart , non screaming , the cables have been cut though.
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| Mon May 17 2010 9:44pm |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2289
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Mr H - I still maintain that slipping gears or threads would
a) not make a steady screech, but have a clicking/rapping element to it either from jumping gear-mesh or stripping threads
b) destroy themselves very quickly under those conditions
BUT the EPB can scream on and off for years (mine has), and function perfectly in between. Stripped gears or threads would degenerate rapidly if not immediately; this has to be a friction interface that can howl and then behave next time, and for weeks before the next howl.
..o0O0o..
I might take you up on the cable-less box, Wex, for the first dissection (as it is NOT re-commissionable) and learn how to pull one to bits, so that I could then do my re-serviceable one non-destructively, and create a "How-to" PDF for the forum. Then folk could strip theirs down and maybe save £200 plus fitting...
I have to say I thought there would be more interest in the interior of the EPB box. Is it just Monday, or don't we all like the "how things work" approach to life  06 TDV6 2.7litre (!) SE Tonga Green
AT2s replaced with ATs, Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)�), Pogo Speed Camera locator (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle), Blackvue FFV
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| Tue May 18 2010 12:53am |
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luvbus
Member Since: 04 Mar 2007
Location: East Yorkshire
Posts: 649
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I wonder if there is some sort of clutch in the white gearbox to protect the motor.
If the controller looks for an increase in amps from a stalled motor to tell it the brake is applied if a clutch was slipping it would keep going and squeal. It might also explain it being an intermittent problem.
No factual basis for this but it would fit the symptoms.
Only one way to find out, smash it to bits!!! Moo ha ha!!  '07 XS, Club AT2, Club 32" BFG M/T, Club Mantec, Club Prospeed Sliders, Club iPad 3 Nav, Club D44 Tank Guard, Club GNVP 2 Position Rods, Club N.E.R.D.S, Club MSV2 - selfish edition... & BAS'd
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| Tue May 18 2010 2:00am |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 15752
 
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I have seen a cutaway diagram of the epb actuator in the past, and I am sure that there is an over run protection clutch. I'll have a look and see if I can find the diagram.
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| Tue May 18 2010 8:17am |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2289
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Luvbus - my thinking entirely! Crunch time soon... Need to see inside... 
Gareth - cheers! - always like to have a map when heading into new territory  The guy at VOSA sent me an indistinct photocopy which only makes sense now that I can see the real thing with the lid off... 06 TDV6 2.7litre (!) SE Tonga Green
AT2s replaced with ATs, Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)�), Pogo Speed Camera locator (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle), Blackvue FFV
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| Tue May 18 2010 11:49am |
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CG
Member Since: 13 Nov 2007
Location: In the middle somewhere
Posts: 3681
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Very interesting thread,
The gears / threaded puller look zinc plated and greased, is that correct or are they just steel.
I would be interested to know also if the part are hardened. knowing how cost concious these thing are, I would not be surprise if some part where soft and a more effective and long lasting dry film lubricant could be used.
Difficult to tell from the photos the wear on the bits.
Is this box a (ex)working one or a knackered one, it would be interesting to compare one of each if available. Formerly shiny moose
Silver TDV6 S with sat nav, PTI, Mantec, Traxide and Moosed up a bit
member of Club MTR
"I know that you believe that you understood what you think I said, but I am not sure you realize that what you read is not what I meant"
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| Tue May 18 2010 1:33pm |
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ridgeback_moor
Member Since: 11 Mar 2008
Location: Gateway to the Moors
Posts: 1603
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I've uploaded the EPB pdf if that helps. A quick flick through doesn't explain where the screech comes from though, but most likely there's a clutch in the drive between the motor and the splined shaft. Maybe for some reason the force sensor is demanding more tension, but the clutch reaches it's limit and slips. A clean out of the drums and shoes seems to cure it most of the time, in my experience.
Good to see the strip down pics 
http://www.disco3.co.uk/gallery/albums/use...0Brake.pdf
Edit: can you get the motor and g/b out, and separate them? I'd be interested to see what's in there. D3 TDV6 S 2005
Bits replaced so far: Suspension compressor, aircon compressor, wishbones front and rear, all ARB bushes, steering wheel, front wheel bearings, seats.
Previous Landies:
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
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| Tue May 18 2010 1:52pm |
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AndrewW
Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2289
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CG - yes it's my ex-screamer... I cannot see ANY signs of wear anywhere, and no piles of dust to suggest an overworked part.
The material seems to be hardened steel - I do have a Poldi tester somewhere - I will try to report back on that. The Splined bit seemed cadmium plated from memory - I will inspect for plating and hardenesses...... Lubrication was minimal (dry?) - adequate but not excessive. The environmental protection is certainly 100% effective.
We have to remember this is German engineering (Küster), so my guess is all the metals will be hard enough for the job  and the machining tolerances pretty good.
r_m - thanks for the PDF - I intend to open up the motor and gearbox - watch this space
Andy 06 TDV6 2.7litre (!) SE Tonga Green
AT2s replaced with ATs, Mantec Plate (with three "dings"), BCB rope, Hidden winch (hidden in garage...), Webasto timer (in box), TorqTuned ((tee hee)�), Pogo Speed Camera locator (in case), Traffic master jam warner (in expectation), FT8800, Motorola GM360, INTEK H-520+ (in a tangle), Blackvue FFV
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| Tue May 18 2010 6:18pm |
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CG
Member Since: 13 Nov 2007
Location: In the middle somewhere
Posts: 3681
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More likely to be Tin Zinc, not sure they can use Cadmium these days.
Like others I would like to see the gears and the clutch. Formerly shiny moose
Silver TDV6 S with sat nav, PTI, Mantec, Traxide and Moosed up a bit
member of Club MTR
"I know that you believe that you understood what you think I said, but I am not sure you realize that what you read is not what I meant"
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| Tue May 18 2010 8:20pm |
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bp
Member Since: 06 Jan 2010
Location: Stuck On The High Road
Posts: 831
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V Interesting just a wondering as I am not bright enough to enlarge the photos but how does the steel cable anchor and if that is slack could it be responsible for some of the horrible noises ?
Look forward to seeing the next bit stripped
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| Tue May 18 2010 9:23pm |
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Iain G
Member Since: 31 Jan 2009
Location: Filey
Posts: 401
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Nice to see some one has taken the initiative and stripped one down, but I, like others have said am under the impression there is a clutch (ball and spring perhaps) that has gone week with time. If you do find something of the sort then a strip down and replacement of the clutch with fixed components could eliminate most peoples problems. Doesn't answer how anyone would re-seal the box bach up though 
Well done, Iain
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| Tue May 18 2010 9:41pm |
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