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Robbie's Rear Brakes - Wear Rate
During the (36k) service this week they recommended a pad change on the rears as they would not make the next service. This took me aback a little as I am very light on the brakes and on my D3 the fronts were always the first to go. I politly declined the £240+ offer to change them for me....
Anyway, just crawled under the car with the measuring stick and sure enough there is 6mm on all the rear pads and 9mm on the fronts. That is plenty meat on them for a while but scratching my head as to why they would wear quicker than the fronts, unless the fronts have a relatively easy time with such large discs and pads.
Is this normal for a D4 or otherwise?
Land Rover - Turning Drivers into Mechanics Since 1948
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Are they worn evenly across the pads at the back? I found one of mine was more worn than the others (and the least worn was the one with the wear sensor!)
29th Jan 2016 3:58 pm
defector
Member Since: 23 Feb 2009
Location: Greater Manchester
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Unless you are carrying something in the back a lot.
On older cars they had front / rear brake compensators (dont know but on Disco it must be electronic) when there was heavy load in the back - or towing -and in those instances the rears actually did more of the braking.
29th Jan 2016 4:26 pm
Robbie
Member Since: 05 Feb 2006
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Sheepy wrote:
Are they worn evenly across the pads at the back? I found one of mine was more worn than the others (and the least worn was the one with the wear sensor!)
I didn't pull the wheels off but the leading and trailing edges of all 4 pads were the same measurement.Land Rover - Turning Drivers into Mechanics Since 1948
Dealer once told me that the rear pads on my Freelander 2 were almost to the metal and needed changing immediately, did I want them to do them. I knew they were OK as I had fitted the winter tyres the weekend before and checked them. I declined the offer Of them to change them.
A couple of weeks later we received a complimentary free winter check by the same dealer, booked it in, well it was free, was advised by the receptionist on collection that the rear pads were worn and I should expect to have the pads done at the next service, they would be ok till then
29th Jan 2016 6:09 pm
Robbie
Member Since: 05 Feb 2006
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I cannot remember how thick the pads are when new (12mm?) but with a service limit of 3mm they may just see me to the next annual service anyway.Land Rover - Turning Drivers into Mechanics Since 1948
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been and looked at a d3 today that apparently needed pads and disc,s all round needless to say the dealer should have gone to spec savers
29th Jan 2016 6:44 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20732
Re: Robbie's Rear Brakes - Wear Rate
Robbie wrote:
Anyway, just crawled under the car with the measuring stick and sure enough there is 6mm on all the rear pads and 9mm on the fronts. That is plenty meat on them for a while but scratching my head as to why they would wear quicker than the fronts, unless the fronts have a relatively easy time with such large discs and pads.
Is this normal for a D4 or otherwise?
I would say yes, it is normal.
The pad compound was changed on the rears for D4 to make them softer, and give a higher degree of friction
The reasoning behind it was the average age of a D4 driver was somewhat older than that of the D3 driver, and the older drivers did not exert as much pressure on the brake pedal when braking
FWIW, my D3 eats it's rear pads. I can't see over 30k from a set of OEM pads, and they are usually changed just before its MOT in May every year. Except this year, whereby they were were worn to almost the metal after 25k (Redstuff)My D3 Build Thread
Member Since: 25 Apr 2015
Location: Suffolk
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Interesting, as this happened on my Freelander2 and the explanation I was given was that it is due, in part, to the electronic stability programme(s) on the car, as brakes, mainly rear, are applied without driver input when cornering to ensure good handling and stability.
Like Robbie, I consider myself easy on the brakes and previous cars had always eaten front pads quicker than rears, but now I have just had the rears on my Disco4 changed at 42K yet the fronts pads should do a few thousand miles more but will probably need discs as well.FFRR Westminster TDV8
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29th Jan 2016 9:46 pm
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
LandPhill wrote:
Interesting, as this happened on my Freelander2 and the explanation I was given was that it is due, in part, to the electronic stability programme(s) on the car, as brakes, mainly rear, are applied without driver input when cornering to ensure good handling and stability.
That is seriously the most amount of main dealer tosh that I have ever heard and is despicable.
Did they also tell you that every time the esp intervenes the yellow light on the dash lights up? Guess not, because if what they said was true you would have seen the yellow light flashing every day wearing out your rear brakes.
30th Jan 2016 1:13 am
LandPhil
Member Since: 25 Apr 2015
Location: Suffolk
Posts: 197
Knew I had the quote from my FL2 days somewhere.
Here it is for what its worth and as the Disco has EBD as well I'm sure there is a read across.
"The Freelander has EBD (electronic brake distribution) and the old days of fronts wearing a lot faster than the rears have long gone. Older cars 'dipped' excessively in the front when braked hard but the FL2 won't.
It's all dependent upon your type of journey, how you drive, how the car is loaded etc. Each wheel can be braked at a different force to another in an attempt to slow/stop or corner the car in a safe manner so its pot luck how they wear."FFRR Westminster TDV8
D4 HSE MY12 Aintree Green. Great car
RRS HSE Lux MY11 Stornoway Grey
Freelander2 SD4 HSE-Best car I have ever owned.
30th Jan 2016 9:28 am
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Ah ok. EBD, electronic brake force distribution is a very different thing to ESP, electronic stability program to which you originally referred.
30th Jan 2016 9:36 am
LandPhil
Member Since: 25 Apr 2015
Location: Suffolk
Posts: 197
Hey, give me a break! It starts with an "E."FFRR Westminster TDV8
D4 HSE MY12 Aintree Green. Great car
RRS HSE Lux MY11 Stornoway Grey
Freelander2 SD4 HSE-Best car I have ever owned.
30th Jan 2016 9:42 am
Robbie
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Cars dip during braking as the centre of gravity is above the effective plane of the retardation force:
The only way to reduce this effect is by suspension geometry (active or passive) or lowering the centre of gravity.
The secondary effect is the apparent shift of weight to the front axle. This provides more grip to the front tyres and reduces the weight through the rears. The brake bias (to the front) reduces the negative side of this effect and takes advantage of the positive side. In no way shape or form are the electronic systems increasing rear brake bias to reduce dip as the retardation force would still be below the CofG and the apparent weight shift would reduce the grip and braking effect on the rears.
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