All Things Mk5 > Performance Modifications
Rear Brake Pad Upgrades....
Teutonic_Tamer:
--- Quote from: DaveB1970 on September 02, 2009, 08:03:52 am ---if the number was 85/15 then the car would feel absolutely awful to drive with excessive wear put on the front suspension to alleviate the massive dive that it would generate.
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Agreed. If it did have an 85:15 bias, everytime you braked hard, the car would try and stand on its nose. But it doesn't. The Golf5 rear suspension has been designed with quite agressive 'anti-dive' geometry - an NEEDS quite a large rearwards brake bias. This is why Golf5s are fairly pitch 'neutral' when braking hard. :happy2:
--- Quote from: DaveB1970 on September 02, 2009, 08:03:52 am ---Whilst I appreciate the advice came from AP (who sell brakes...front brakes.....) I would be sceptical that its actualy that bad in reality, sometimes generic flippant remarks come out with no real substance......
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I fully agree! AP have NEVER backed up this statement! :stupid:
--- Quote from: DaveB1970 on September 02, 2009, 08:03:52 am ---If the bias was indeed as bad as that the first thing on my shopping list would be a huge rear brake kit IMHO
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Exactly, couldn't agree more! :happy2:
--- Quote from: DaveB1970 on September 02, 2009, 08:03:52 am ---Braking is about balance - 85/15 sound right to you???
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Not at all correct, by a long margin! :wink:
Teutonic_Tamer:
--- Quote from: RedRobin on September 02, 2009, 10:07:59 am ---My AP Big Brake Kit was fitted by their Senior Engineer at Coventry with myself present. At that time in 2006, I asked him whether he thought it was worth also fitting their AP brakes to the rear and he said no, saying that about 85% of braking on the Mk5 Golf was done by the front brakes and the power of the front AP's would 'do the job'.
The 85% value has been mentioned by him again since 2006 in our conversations and also yesterday when I specifically asked for his advice about what would be best to do now that I occasionally track (Nurburgring).
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If AP are still standing by this bias rate, perhaps you can ask them to provide individual wheel braking effect readings from a rolling brake tester. But I honestly bet they wont be able to! :wink:
QD MBE:
As I have said, the car feels spot on with the FULL S3 upgrade, very well balanced front and rear braking. You can feel the rears working and for the money, I would rather have a system that was designed by the manufacturer to work on a similarly sized platform such as the S3.
The front may not be as 'Eye-candy' as AP, Tarox, or Brembo, but the system works very well. It is all about function for me. That is why I think the Audi S3 looks a far better car that the pictures of the golf R20.
But as always each to their own.
:happy2:
Teutonic_Tamer:
--- Quote from: DaveB1970 on September 02, 2009, 11:45:05 am ---robin 85/15 would drive crap and thats the sort of split I would expect from a ford fiesta with rear drums.....
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And that would usually be with the assistance of a relatively 'dumb' pressure limiting valve in the rear hydraulic circuits.
--- Quote from: DaveB1970 on September 02, 2009, 11:45:05 am ---Front end dive is not a good trait - wherever possible 60/40's ///// 70/30 is the figure normally aspired to
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Agreed, and on modern cars with anti-dive rear suspension setups, they can often run closer to 55:45 front to rear.
And I don't know if you are aware, the new Renault Laguna has larger REAR brakes than it does up front, and that is a front engine, front wheel drive car. The rears really do play a massive part not only in traditional 'braking', but also in terms of vehicle stabilty, when controled by ESP systems.
--- Quote from: DaveB1970 on September 02, 2009, 11:45:05 am ---Dont know whether its an installation issue but the 2500 compund has been getting a bit of a slating recently over on uk-mkivs, the pad of choice over there at the moment seems to be the pagid blues
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Ferodo went through some very serious quality issues in the 1980s and early 90s! Anyway, are these Pagid Blues the same as Pagid RS pads? :confused:
Teutonic_Tamer:
--- Quote from: RedRobin on September 02, 2009, 01:14:58 pm ---Just thinking aloud, but both the oem R32 and S3 rear brakes will surely have been designed to work on 'driven' rear wheels (be it Haldex or quattro).
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Not really. When the brake pedal is pressed, the Haldex automatically disengages the drive to the rear wheels. Haldex only sends drive to the rears during acceleration, and then only after the fronts have lost traction. So that thought, whilst perfectly reasonable, is not technically correct! :wink: :smiley:
--- Quote from: RedRobin on September 02, 2009, 01:14:58 pm ---Does this suggest that fitting them on the rear of the FWD Mk5 GTI may be overkill?
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Nope! :happy2:
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