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Old 27th April 2018, 08:35 PM   #1
zeemaxkid
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Default Which brake upgrade would you choose?

Hi Iíd like peopleís input. Iím purchasing a set of front brakes for my m3 e46. Iíve been looking at these brembo 6 pot kits doing the rounds which Iíve seen for sale on here in the group buy section. I believe they come with csl discs etc. Iíve found a set of AP 6 pots on Godspeed with 355mm discs and alloy bells. Iím not sure which set to buy. Has anyone used or had a set of either and if so is there any proís or conís to consider with either. Any help would be much appreciated. I wasted £1300 last year on a set of high spec monster brakes which were complete crap and I had to ditch them due to brake fade. Thanks in advance.
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Old 27th April 2018, 08:47 PM   #2
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Go godspeed ap's
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Old 27th April 2018, 08:50 PM   #3
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Thanks for the input.
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Old 27th April 2018, 09:17 PM   #4
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Depends what you want from them. I've got the BMWP 6 pots with RS29's on my M3, which are perfect for my daily driver, but I chose them more so from a reliability standpoint as they were designed for road cars and have good piston seals (provided you don't melt them!) If they were for track use then they are less suited as the seals suffer and pistons can crack, but for fast B road stuff they've been pretty good, plus I get rotors quickly and cheaply from any main dealer if needed. I've had K sports which were ok, and I've got AP's on my E39 but they have no dust seals and have suffered sticky pistons and corrosion forming behind the pad guide plates so they take a bit more looking after, plus rotors are more expensive.

In essence they're both great set ups though which I would definitely buy again, but it depends on what you want a kit to give you.
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Old 16th May 2018, 09:49 AM   #5
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Just to confirm, an AP kit can have dust seals and even if used gently can be perfectly acceptable for road use without requiring any more care than other brakes. They may well be overkill however.
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Old 17th May 2018, 06:37 AM   #6
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Quote:
Originally Posted by zeemaxkid View Post
Hi I’d like people’s input. I’m purchasing a set of front brakes for my m3 e46. I’ve been looking at these brembo 6 pot kits doing the rounds which I’ve seen for sale on here in the group buy section. I believe they come with csl discs etc. I’ve found a set of AP 6 pots on Godspeed with 355mm discs and alloy bells. I’m not sure which set to buy. Has anyone used or had a set of either and if so is there any pro’s or con’s to consider with either. Any help would be much appreciated. I wasted £1300 last year on a set of high spec monster brakes which were complete crap and I had to ditch them due to brake fade. Thanks in advance.
I had the BMWP Brembo 6 pots with CSL discs on a CSL and they were a massive improvement over the standard set up. These were paired with hel braided lines, motul rbf600 fluid and RS29 pads. I have not tried the godspeed set up but the AP 356x32 kit is a step up from from the BMWP kit but not as big a step as I expected. Neither gave any fade on track.
Were you using a high spec brake fluid and track biased pads when you were getting brake fade or was it on standard fluid with average / road pads?
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Old 17th May 2018, 07:27 AM   #7
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Quote:
Originally Posted by sydown View Post
I had the BMWP Brembo 6 pots with CSL discs on a CSL and they were a massive improvement over the standard set up. These were paired with hel braided lines, motul rbf600 fluid and RS29 pads. I have not tried the godspeed set up but the AP 356x32 kit is a step up from from the BMWP kit but not as big a step as I expected. Neither gave any fade on track.
Were you using a high spec brake fluid and track biased pads when you were getting brake fade or was it on standard fluid with average / road pads?
The pads were supplied with the calipers and also the brake fluid was supplied with the kit. I didnít bother changing the fluid because Iíd recently had a service and it had been fully changed by the garage. The brake lines were braided and also supplied which were not any make Iíd herd of before. Iím still not sure which kit to go for. Iím worried about wasting more money.
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Old 17th May 2018, 09:13 AM   #8
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I’d go K sport, the new forged generation calipers are a major step up in quality
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Old 17th May 2018, 11:36 AM   #9
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Go for the Reyland or Godspeed AP set up.
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Old 17th May 2018, 12:38 PM   #10
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Quote:
Originally Posted by zeemaxkid View Post
The pads were supplied with the calipers and also the brake fluid was supplied with the kit. I didnít bother changing the fluid because Iíd recently had a service and it had been fully changed by the garage. The brake lines were braided and also supplied which were not any make Iíd herd of before. Iím still not sure which kit to go for. Iím worried about wasting more money.
Have you sold the hi spec calipers? If not I would give them another chance with good fluid and good pads. Brake fade is usually caused by overheating the components whether that be fiction fade as the pads aren't designed to handle the temperatures or fluid fade as the brake fluid ends up boiling which introduces air into the system. I can't imagine the fluid and pads supplied with the kit would be up to the job!
Better calipers and discs will make a difference but pads and fluid are the most important imho.
Before I used the BMWP brembo caliper I used standard discs and calipers with rs29 pads, hel lines and motul brake fluid and had no issues even on track in the height of summer.
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Old 17th May 2018, 12:48 PM   #11
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After many different variations of brakes I have ended up with the ap CP9660 caliper but these are massive overkill for fast road use!

IMG_1230 by sy down, on Flickr
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Old 27th May 2018, 03:26 PM   #12
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I've recently gone the route the AP Pro5000R (9660) with BTCC 368x36mm rotors which has proved to be fairly cost effective when comparing to a kit from Reyland or similar using older design calipers... but is very ott for a road car imo.

If mine didn't see any track use I'd be looking at the M135 mperformance calipers with 345mm CSL discs...
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Old 27th May 2018, 03:27 PM   #13
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I have a set of K-sports (forged monoblock calipers) for sale, with almost new discs and RS29 pads.
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