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Neil.P
Member Since: 14 Nov 2014
Location: Bridgend
Posts: 17
  
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| Vibration at motorway cruising speeds. |
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Hi all,
I've been having an intermittent vibration that has become more regular when cruising on motorways. It's not wheel balance.
It is also accompanied by very hot rear brakes.
I had a theory that it might be caused by different rear tread depths causing the 4 wheel drive system to think that one wheel is rotating more than the other and causing the brakes to bind in order to reduce rotation?
I checked and adjusted all tyre pressures, which did need adjusting. I took the disco for another long motorway drive and all was smooth and very pleasant once again.
Have I made the correct conclusion to the problem, or are tread depths and tyre pressures just a red herring?
Over to all you wise owls. 
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 8th Jan 2019 11:18 pm |
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Moo
D3 Decade
Member Since: 13 Aug 2010
Location: Wiltshire
Posts: 13904
 
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Sticking brake calliper? New Defender L663 110 SE (known as Noddy!)
Sold Volvo XC90 R-Design (known as Basil)
Sold - D4 HSE (Known as Gerty)
No longer the Old Buses original owner 
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
EGRs blanked
T-Max split charge
Hanibal Expeedition rack
Prospeed ladder
Duratrac tyres
IID BT
BAS FBH control
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| 8th Jan 2019 11:23 pm |
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Neil.P
Member Since: 14 Nov 2014
Location: Bridgend
Posts: 17
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If it were a sticking brake calliper, it would be sticking on permanently, but the vibration is more of a pulsing.
This is why I think the brake is being applied by the stability control/4x4 system to compensate for an over rotating wheel.
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| 9th Jan 2019 8:56 am |
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Farmer Chalk
Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4156
 
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Moo wrote:Sticking brake calliper?
Agree with Moo.... had this myself and it drives perfectly normally until at motorway speeds when the overheating disc then starts snatching....once you were off the motorway it drove normally...
Easy test.... drive it around for a little while and then stop and go around and touch each alloy wheel...one of them will be significantly warmer to touch.... 
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| 9th Jan 2019 9:09 am |
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john watson
Member Since: 10 Nov 2011
Location: lanark
Posts: 956
 
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If discs are not check the rear prop shaft centre bearing. Once you have defeated the idiots any job is half done. Pity there are so many idiots to defeat.
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| 9th Jan 2019 9:25 am |
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al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10297
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that rumbling and hot rear brakes is usually down to sticking handbrake shoes, but it doesnt usually come and go, once it starts its usually terminal for the handbrake shoes - but might be worth checking.
Al Volvo XC90 B5 Plus Dark
Gone - MY18 D5 HSE - Corris on 22's with Black Pack
Now gone - MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
Older - D3 TDV6 XS Auto - Lugano Teal with Almond Leather, 20" Stormers, Shiny Tailpipes, DVD/TV - and obligatory D3 sticker
Ancient - D3 TDV6 S - Tonga with Ebony, 20" Stormers, satnav & DVD
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| 9th Jan 2019 9:52 am |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12707
  
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Had a Vauxhall Carlton years ago that did exactly this after main-dealer service, twice!
It was over-adjusted handbrake pads binding when doing more than 60 ... slow down and they cooled/contracted enough not to bind. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
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| 9th Jan 2019 10:10 am |
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HughMartin
Member Since: 30 Mar 2008
Location: Aberdeenshire
Posts: 751
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I had this and it was a rear parking brake shoe which had become partially detached. Only felt the vibration at certain speeds. Strip and service rear brakes.
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| 9th Jan 2019 10:20 am |
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Neil.P
Member Since: 14 Nov 2014
Location: Bridgend
Posts: 17
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Since adjusting tyre pressures to correct levels the back brakes are not overheating and no vibration on motorway.
I know the 4x4 system uses the brakes to prevent a wheel from spinning/overrotating, so, because the tread depth of the rear tyres are different (one with good tread, the other end of life), combined with imbalanced tyre pressures, this is why I think it's causing the vibration as the brakes work to prevent the overrotation on one wheel.
I did also notice the DSC warning light flash on while on the motorway on one occasion during the vibration too.
I should add that I had all new brakes, disks, parking brake shoes, callipers and back plates last year. Basically all new brakes except for front callipers.
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| 9th Jan 2019 5:24 pm |
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Dan the Man
Member Since: 20 Mar 2014
Location: Glasgow
Posts: 215
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I recently experienced a similar vibration problem on my Golf R.
Had all wheels rebalanced to no effect.
Noticed it was worse when cornering in one direction.
Turned out to be the wheel bearing.
If badly worn I’d imagine a wheel bearing would also generate heat from the friction.
Hope you’ve fixed it now anyway.
 1981 Unimog U1300L (ex German Army vehicle
Previous:
Discovery 3 G4 Challenge
Golf R DSG
BMW 535d M Sport Touring
2010 D4 HSE in Nara Bronze
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| 9th Jan 2019 9:36 pm |
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PCT3
Member Since: 13 May 2017
Location: Kent
Posts: 144
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Think people have forgot if you run a permanent 4 wheel drive all rolling radius should be the same or very close, believe VAG models have app 10% allowance BMs around 8% Subras 5% sum older BMs with miss matched tyres are blowing transfere boxes. I have always replaced tyres as a set of 4 and rotated regularly to try and even wear Discovery 3 HSE 07
Discovery 1, Search & Rescue SE4x4 Responce
Fiat Decato motor home
Mazda MX5
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| 9th Jan 2019 11:47 pm |
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Neil.P
Member Since: 14 Nov 2014
Location: Bridgend
Posts: 17
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PCT3. That's what I was thinking. I was waiting for someone to put the fear of god in me about different tyre radius.
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| 10th Jan 2019 8:36 am |
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