Discussion in 'General maintenance, upgrades and modifications' started by zeemaxkid, Apr 27, 2018.
Go godspeed ap's
Thanks for the input.
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.
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.
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 didn’t bother changing the fluid because I’d 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 I’d herd of before. I’m still not sure which kit to go for. I’m worried about wasting more money.
I’d go K sport, the new forged generation calipers are a major step up in quality
Go for the Reyland or Godspeed AP set up.
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.
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
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...
I have a set of K-sports (forged monoblock calipers) for sale, with almost new discs and RS29 pads.