All Things Mk5 > Performance Modifications
Rear Brake Pad Upgrades....
RedRobin:
--- Quote from: gillm on September 01, 2009, 07:44:59 pm ---
never had a problem with them on track and don't really see the point . braided hoses will help tho
--- End quote ---
....Weeeell, I'm inclined to take AP Racing's advice.
Perhaps adding braided hoses to the rear may also help but I won't bother with that until my next brake fluid change and also until speaking with AP and VWR again.
Hurdy:
--- Quote from: RedRobin on September 01, 2009, 07:58:02 pm ---
--- Quote from: gillm on September 01, 2009, 07:44:59 pm ---
never had a problem with them on track and don't really see the point . braided hoses will help tho
--- End quote ---
....Weeeell, I'm inclined to take AP Racing's advice.
Perhaps adding braided hoses to the rear may also help but I won't bother with that until my next brake fluid change and also until speaking with AP and VWR again.
--- End quote ---
I remember asking T_T (Sean) about braided hoses in the past. He said that the OEM hoses are banded internally anyway and that they are more than up to the job. :happy2:
DaveB@Vagbremtechnic:
I'd be very surprised if the bias figure was 85/15, the figure for the Mk4 was calculated at 74/26 and with the Mk5 Gti having 286 rear discs as opposed to 256's then the bias would probably be rearward from the Mk4
This despite the fact that the MK5's front piston is 1.5mm bigger on radius than the Mk1 TT/Mk4 setup, same rear piston, same MC
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.
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......
Now having said all that if that figure arrived from a conversation that took into account disc size, piston surface area,pad surface area, master cylinder piston stroke and surface area, pad material and piston rollback measurements then I stand to be corrected and please accept my apologies
If the bias was indeed as bad as that the first thing on my shopping list would be a huge rear brake kit IMHO
Braking is about balance - 85/15 sound right to you???
RedRobin:
^^^^
@ DaveB,
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).
Now, it is of course possible that his use of the term "85%" is more to emphasise that the rear brakes do relatively little. "85%" possibly over emphasising? But "flippant"? - I very much doubt it. In our chat yesterday he also made the comment that the oem rears on the GTI were more designed for 'street' stopping as opposed to a workout on The Ring.
AP Racing (once known as Lockheed) do far more than sell brakes - They design and test brakes and clutches for car manufacturers (they are an autonomous arm of Brembo), F1 (first 9 of the finishers at Spa last weekend), and NASCAR etc etc. When I first visited them they were 24/7 bench testing calipers for the Bugatti Veyron for example.
--- Quote from: DaveB1970 on September 02, 2009, 08:03:52 am ---
Now having said all that if that figure arrived from a conversation that took into account disc size, piston surface area,pad surface area, master cylinder piston stroke and surface area, pad material and piston rollback measurements then I stand to be corrected and please accept my apologies.
--- End quote ---
....I'm confident that his knowledge as AP's Senior Engineer will have taken such technical factors into account.
The question is whether his "85%" comment is to be taken literally or as emphasis - I would have to ask him when we next speak.
RedRobin:
--- Quote from: monkgti on September 02, 2009, 06:17:44 am ---
R32's have vented 312mm discs on rear which are larger than a standard GTI fronts!
Also it's a cheap oem upgrade (I gave £280 for a complete F&R setup).
I think the rear pads are the same also, just the caliper carrier is moved out in comparison to accomodate the larger disc size.
--- End quote ---
....Do you know how much R32 312mm discs weigh?
Are you saying you bought a new set of front and rear R32 brakes for £280?
One of the reasons for upgrading the pads to DS2500's on oem GTI rears is to reduce generated heat and its ramifications.
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