Member Since: 08 May 2006
Location: Bristol
Posts: 16390
Brake Pad comparison
changed the discs and pads yesterday and noticed quite a difference in the surface area of the pads.
on the left we have the rear pads that were fitted, made by Ferodo
on the right we have the new pads by TRW, courtesy of Steve at AF.
I was a little surprised! - had to double check the manufacturer when I laid them side by side.
front pads were identical though
Click image to enlarge
Duncan
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17th Feb 2016 1:18 pm
armalites
Member Since: 17 Aug 2013
Location: Herefordshire
Posts: 1918
I've noticed this quite a lot on Volvo pads, some manufacturers list multiple variants. The metal backing can be exactly the same but with different friction areas. Then you find people like APEC will just list one.
There is quite a difference in those two.IID PRO
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17th Feb 2016 1:24 pm
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Early D4s (generally 2010MY) have different (alloy) rear callipers to subsequent ones.
LR definitely list two different pads for the two different types of rear calliper - although both 'fit' they have different pad shapes.
A lot of aftermarket manufacturers seem to only list one type which is the later one - they fit but no idea whether its right/safe/makes any difference to fit the later shape to the earlier calliper.
To be clear I am not saying that AF have sent you the wrong pads - the view maybe that the later ones are just fine.
However if you went to LR you would get the earlier type if you had the earlier type calliper fitted (determined by VIN) - LR thought it was enough of an issue to send a bulletin round the dealers reminding them of the two different types - I remember TLO posting it and reminding us that there is a small number of early D4s out there with different rear brakes.
I couldn't find the earlier shape from anywhere so purchased them from LR because I wanted to replace with exactly what was fitted.
17th Feb 2016 1:44 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Pretty sure the later D4 pads for the cast iron callipers are actually the original D3 rear pads.
They moved from aluminium rear calipers to the cast iron type from VIN AA547440 onwards.
A surprising difference in the contact patch between the pads shown in the above picture. I know which one I would prefer to have.
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Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Yes Robbie on face value I know which ones I'd prefer in theory - but then I don't know the theory of why the pads for the alloy calliper were designed differently? I'm of the opinion that there almost certainly must be a reason?
You can't get away from the point either that LR are insistent that you should use the correct pads for each calliper. Why is that if it isn't important?
Of course all of this assumes that DiscoDunc has alloy callipers and that is the reason for the different pad shape.
17th Feb 2016 2:50 pm
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Disco_Mikey wrote:
All D3 + D4 rear pads are the same, and interchangeable, whether with cast or alu calipers
They may well be interchangeable but they are not the same. The pads fitted to the D4s with alloy callipers are a different shape hence having a different part number up to VIN AA547440
LR's advice to their service centres is that you do not mix and match them.
17th Feb 2016 2:53 pm
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Mikey - doesn't the picture just confirm that the non-alloy pads fit both callipers - so the aftermarket suppliers just supply the one type probably so they have to carry less stock?
As DiscoDunc (and I, sometime ago) discovered, the original pads for alloy callipers are a different shape - that's a fact. If you go to a LR main dealer and have the rear pads changed you should get the different shaped ones (I did, without asking or mentioning it).
The only reason I'm arguing the toss is because I'd actually quite like to know why they were intentionally designed to be different!
FWIW the only pads that will ever be going into my rear brakes will be ones that are exactly the same shape as the ones that came out of them. Just because something 'fits' doesn't make it 'right' in my book.
17th Feb 2016 4:30 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20732
D3 pads were superseded to that of D4. Buy a set of genuine rear pads, and they are the same shape as that of the D4 pads, both for alloy and cast calipers
When the D4 first came out, they had the pads as on the right of duncs picture. Then after a bit or market research, they changed the design and compound of the rear brake pads to that of the left pad
That makes all the D3/4 rear pads interchangeable
Those of you wanting longevity from the rear of their D4, then the (Genuine) D3 pads are a harder compound than the D4
I suppose fitting RRS arms to a D3 isn't right either?My D3 Build Thread
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18457
Checking the part numbers from TLO's original thread, there are still two distinct part numbers for the pads for alloy calipers (LR015519) and those for the cast iron calipers (LR055454).
D3 pads are LR055454 so the same as for D4 with cast iron calipers as Mikey says.06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
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