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Brakes for 700+ bhp

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Old Mar 2, 2019 | 01:25 PM
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Default Brakes for 700+ bhp

Was thinking ap 6 pots are they good enough for that power?


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Old Mar 2, 2019 | 03:51 PM
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Defo six pots, 4 would be fine as long as big enough discs to match the weight of the car and tyre width etc.
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Old Mar 2, 2019 | 04:08 PM
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Yes mate wouldn't be 4 pots will be as big as possible to go behind the 19's will speak to Martin Hadland closer to the time

Last edited by smiley; Mar 2, 2019 at 04:09 PM.
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Old Mar 2, 2019 | 04:10 PM
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Bloody auto correct on phone auto wrong mine's dyslexic
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Old Mar 2, 2019 | 04:21 PM
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4 or 6 pots doesn’t matter that much, that’s more about pedal feel. I’d go as big in the diameter and thickness of the discs as possible. For the rear I would get something to have a good brake balance, as it is easy to go to big on the rear.
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Old Mar 2, 2019 | 04:35 PM
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Thanks Mark will sort rears also and bias valve, just a question you say it doesn't matter much why are thier 4 6 8 pots? More pistons more clamping force no?
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Old Mar 2, 2019 | 04:48 PM
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I’ve got latest spec BTCC calipers and rotors. Not really that much more than an off the shelf AP set up. Bonus being BTCC teams will sell you the rotors and conditioned pads cheap. They rarely use rotors more than one meeting.
Ive bought 3 spare sets of rotors and pads for less than 1 new rotor from AP
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Old Mar 2, 2019 | 04:50 PM
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Old Mar 2, 2019 | 05:11 PM
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Originally Posted by smiley
Thanks Mark will sort rears also and bias valve, just a question you say it doesn't matter much why are thier 4 6 8 pots? More pistons more clamping force no?
The clamping force is not about the number of pistons. It is about the total surface area of the pistons. And 6 pot calipers have smaller pistons than 4 pots. The AP 6 pots actually have exactly the same surface area as the AP 4 pots. But the 6 pots do give a better distributed clamping force, which is needed for big discs as the caliper becomes quite long.

But you should really keep the surface area of the pistons close to what they are now. It is matched to the master cylinder and using a different surface area will change the pedal travel and the pedal feel. The same goes for the rear. In my opinion you shouldn’t put the AP 4 pots, as are sold as a bolt on kit, on the rear as the pistons are too big and overbrakes the rear.
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Old Mar 2, 2019 | 05:25 PM
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Where do you source your stuff from if you don't mind me asking? - jonfoc
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Old Mar 2, 2019 | 05:41 PM
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Originally Posted by visa_broke
Where do you source your stuff from if you don't mind me asking? - jonfoc
Just a mate who's a team manager. I can ask the question if you want anything. There's a guy on eBay who sells the tyres from teams. Can't remember his name, he shifts stuff but tops you up on price
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Old Mar 2, 2019 | 06:21 PM
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Cheers for the explanation mark I will be using tilton pedal box and res set up, wouldn't use 4 pots rear mate

jon been looking at those calipers on eBay thiers been a pair on thier a while about 750 each look pukka
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Old Mar 2, 2019 | 06:32 PM
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I'd love the 9665 calipers so might move my 9660 kit on.
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Old Mar 2, 2019 | 06:37 PM
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Are they all the same to bolt on just brackets need making for specific car?
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Old Mar 2, 2019 | 06:40 PM
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Yes mate. Martin Made mine.
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Old Mar 2, 2019 | 06:48 PM
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The 4 piston ap’s Are 1 kilo per side lighter than the 9665’s that is a huge amount unsprung.
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Old Mar 2, 2019 | 06:55 PM
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I'll be saving weight with the Smith and Jones but putting it back with the cage lol the focus is quiet heavy will be stripped out though
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Old Mar 2, 2019 | 07:19 PM
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Smith n Jones is 25kg saving
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Old Mar 2, 2019 | 07:56 PM
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Yes mate will help
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Old Mar 2, 2019 | 08:06 PM
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The standard brakes... lol

Cheers Paul
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Old Mar 2, 2019 | 08:22 PM
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I'm king of the late brake Paul gotta be good lol
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Old Mar 2, 2019 | 08:39 PM
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Originally Posted by smiley
I'm king of the late brake Paul gotta be good lol
Def get some good stoppers on then ha ha

Cheers Paul
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Old Mar 3, 2019 | 09:28 AM
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Jon what size rotors will those calipers take
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Old Mar 3, 2019 | 11:41 AM
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Originally Posted by smiley
Jon what size rotors will those calipers take
343mm upto around 380mm, they are really a race caliper though as they dont have dirt boots.
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Old Mar 3, 2019 | 11:54 AM
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Originally Posted by Martin-Hadland
343mm upto around 380mm, they are really a race caliper though as they dont have dirt boots.
thanks Martin just found this

Lscman said:03-03-2004 10:13 AM I don't think anyone has properly addressed the street vs track issues here: Dust boots serve absolutely no purpose until the piston is pushed back into it's bore during pad replacement. As pads wear, fresh piston is exposed and the dirty, exposed portion of the piston does not affect the caliper seal or fluid. A race caliper gets freshened up and possibly rebuilt several times each season. It does not see weathering or high corrosion under race use, so the dust is easily wiped or scraped off as the piston(s) are returned to their bore when installing fresh pads. On the street, the highly corrosive dust that has accumulated and aged on the piston has turned into a solid, rusty crust coating after seeing humidity and rain for months or years. Trying to return the scaly piston into it's bore can result in sealing o-ring leaks. Maintenance intervals and pad wear rates on street setups is usually very different. This is why street setups use dust boots. Dust boots make changing or removing pistons more difficult. Dust boots smolder and/or ignite into useless blobs of rubber at elevated track use temps (over 750 degrees F). Conclusion: If you use race calipers with no dust boots on the street, you'd better remove and thoroughly clean the pistons with a toothbrush before pushing them back in their bores. Race calipers are not designed to have their pistons sticking out of the bores for two years between pad changes & corrosion from being exposed for extended interval & driven thru all weather. The corrosion and crust buildup that forms on the exposed pistons from street use WILL be a problem....unless you're street racing and going thru pads every month. In this case, the frequent wiping will keep the pistons fairly clean. Rebuilding a wilwood caliper typically involves popping the pistons out with compressed air & dropping a $3 viton seal into the groove. This should be done once a year or so. A good mechanic can do this whole job in about 15 minutes, so it should be done every couple times you change pads. The pistons should not need changed more than once every 10 years or so

Last edited by smiley; Mar 3, 2019 at 12:01 PM.
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Old Mar 3, 2019 | 12:30 PM
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So would just require regular cleaning Martin?
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Old Mar 3, 2019 | 12:50 PM
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Scott do you think this will be a daily driver or even used in bad weather? I'm not worried about them being on the road. It's only an hour to drop the wheels off and give a good clean.
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Old Mar 3, 2019 | 01:04 PM
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No it won't mate bad weather maybe, any excuse to get the spanners out is good lol is yours a road car Jon? Wasn't sure
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Old Mar 3, 2019 | 01:08 PM
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Pure track for me mate. Might be tempted to get some softer springs for the occasional road thrash.
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Old Mar 3, 2019 | 01:13 PM
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Cool mate fast road occasional track and q mile mine will be
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Old Mar 3, 2019 | 09:29 PM
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I've had CP5200 4 pots on my car for over 10 years, no dust boots.

Car doesnt get used regularly, which in some respects can be worse, but I've had zero issues with them or corrosion etc. Although they've only ever seen one bad salty winter.

As for brakes....really depends on usage you intend.
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Old Mar 4, 2019 | 05:55 AM
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Cheers stevie will go with same calipers as jon
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Old Mar 4, 2019 | 09:42 AM
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Originally Posted by stevieturbo
I've had CP5200 4 pots on my car for over 10 years, no dust boots.

Car doesnt get used regularly, which in some respects can be worse, but I've had zero issues with them or corrosion etc. Although they've only ever seen one bad salty winter.

As for brakes....really depends on usage you intend.
cp5200 do have a dust seal each piston/ bore has 2 seals an outer dust/dirt seal and the inner hydraulic seal
what its doesn't have is the type of rubber boot seal fitted to oe calipers

Steve
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Old Mar 4, 2019 | 05:17 PM
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Originally Posted by stevieturbo
I've had CP5200 4 pots on my car for over 10 years, no dust boots.

Car doesnt get used regularly, which in some respects can be worse, but I've had zero issues with them or corrosion etc. Although they've only ever seen one bad salty winter.

As for brakes....really depends on usage you intend.
Stevie, CP5200 calipers have dirt boots, the grey motorsport version CP5040 doesn't though.
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Old Mar 4, 2019 | 05:19 PM
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Originally Posted by smiley
Cheers stevie will go with same calipers as jon
Be very careful where you buy them from! Fakes of those are being sold on eBay right now.
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Old Mar 4, 2019 | 06:43 PM
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Only 1 place in U.K. to buy new AP’s imo....there is a Lambo parked outside.
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Old Mar 4, 2019 | 06:58 PM
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Originally Posted by Martin-Hadland
Be very careful where you buy them from! Fakes of those are being sold on eBay right now.
yes mate seen them cheaper today on demon tweeks website what price can you get these for mate? Pm if you prefer I'll be comming to you for brackets and bells once I've sorted the custom hub flanges need 5 x 108 pcd for the focus rs wheels, what's max size rotors under them Martin the 19's
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Old Mar 4, 2019 | 07:06 PM
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CP5555's on mine these have the dirt/dust seals
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Old Mar 4, 2019 | 09:11 PM
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Originally Posted by Martin-Hadland
Stevie, CP5200 calipers have dirt boots, the grey motorsport version CP5040 doesn't though.
There's nothing visible from the outside, as would be on an OEM caliper ?

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Old Mar 5, 2019 | 06:03 AM
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Originally Posted by stevieturbo
There's nothing visible from the outside, as would be on an OEM caliper ?
As both Martin and myself explained, its not like an OE caliper, the dust seal is just inside the bore then slightly deeper the hydraulic seal
I regularly re seal these calipers on my race car Ive got 3 sets of these calipers all are the same seal arrangement

Steve
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