Good-Win Racing Mazda Performance Parts

Powerbrake X4 12.75" Big Brake Kit (front)


Stop Like The Pros!

Miata MX5 2006-2015 · Brakes · Brake Kits and Complete Packages

Part Number: 61-2064

Application: 2006-2015

Price: $1,999.00


Powerbrake X4 12.75" Big Brake Kit (front)
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X-Line Big Brake Kit Range Design Philosophy

For 2016 Powerbrake has launched our next generation X-Line big brake kit range. Powerbrake X-Line calipers are true race calipers that can also be used in long-term street and track day applications as a result of a number of additional design features that have been incorporated into the caliper designs. The X-Line big brake kit concept is to supply customers with a crossover product line that (when fitted with the appropriate pad compound for the intended application) can be used over a wide range of enthusiast and race applications including fast-road, track day and full race. To be clear - Powerbrake X-Line calipers are true race products. Machined from solid billet aerospace grade aluminum, these calipers feature ultra-rigid FEA enhanced designs, scalloped stainless steel pistons and type-3 mil-spec hard anodised finish typically only found in high-level works race calipers. The addition of internal wiper seals and all stainless steel hardware (bleed screws, tube nuts, pad retaining pins, abutment plates etc) further enhances the long term durability and service life of our X-Line calipers under every day street driving conditions. The result is one of the most versatile big brake kit ranges on the world market. Powerbrake X-Line = Works-level race calipers that can also be used for long-term street and track day applications (when fitted with appropriate pads).

Powerbrake (X4ES) Compact 4-piston X-Line caliper


Compact 4-piston race caliper.

Design is FEA optimised for maximum strength and rigidity.

Machined from the highest quality aerospace grade aluminium billets resulting in optimal strength and rigidity.

Caliper bodies are mil-spec type-3 hard anodised for max durability and wear resistance.

Stainless steel pistons ensure maximum durability and significantly reduce heat transfer rate to seals and brake fluid (when compared to the aluminium pistons used by many of our competitors).

Pistons are scalloped to allow super-heated air to escape resulting in reduced operating temps and hand polished to a mirror finish on the outside diameter to assist in achieving maximum seal life.

Ultra-high temperature pressure seals and internal wiper seals ensure maximum durability and service life.

High-tensile caliper cross-bolts are manufactured in Europe and coated with a proprietary anti-corrosion coating that provides unmatched corrosion resistance and does not negatively affect bolt strength at all.

Seamless CuNi fluid crossover tubes (not pictured in the renders below) provide maximum corrosion resistance and unmatched resistance to vibration-related issues (that can affect seamed tubes used by many of our competitors).

All other caliper hardware (bleed screws, tube nuts, pad retaining pins and pad abutment plates) are stainless steel for maximum corrosion resistance.

Maximum Temperature Recording (MTR) system provides a permanent record of the peak operating temperatures reached by the calipers during use.

All logos and serial numbers are laser-etched onto the calipers which makes them impervious to damage from brake cleaners and solvents (as is the case with the painted logos used by many of our competitors).

Pad Profile

The pad profile chosen for X4ES race caliper is available in the complete range of Powerbrake street, track day and race pads compounds. The profile is also available from most high-performance and race pad manufacturers world-wide.

Rotors - The disc friction rings used in our X-Line disc assemblies are cast from a proprietary high-carbon cast iron alloy cast in Europe that provides excellent durability and stability under the high thermal loads experienced during race, track day andamp; fast road driving. The discs feature our curved, directional, staggered cooling vane design that increases cooling vane surface area for optimal cooling.

Maximum Temperature Recording (MTR)

Blue paint " turns light brown at 527 deg F

Green paint " turns white at 860 deg F

Orange paint " turns yellow at 1022 deg F

Red / Pink paint " turns white at 1166 deg F

Wide Red paint strip " various shades from 219 " 2318 deg F

Powerbrake X4 / 325x28mm (12.75 ) big brake kit (front)

2 x PB-X4 billet 4-piston race calipers, including top caliper brace, stainless steel pistons and hardware (hard anodized).

2 x Two Piece floating disc assemblies featuring our SASS-float system, staggered cooling vanes and billet hats (hard anodized).

2 x Billet aluminum caliper mounting brackets (hard anodized).

2 x Stainless steel braided Teflon brake lines with 32-strand stainless steel braid and stainless steel end fittings.

All necessary mounting hardware.

*** Product images may differ from actual product appearance ***


I received the Roadstersport II, and I wanted to compliment you guys on an awesome product. The Miata should have these on from the factory. They make a great sound, that is not obnoxious at all. The exhaust also installed seamlessly!!! I will buy all of my Miata stuff from you in the future. Thanks,

-- Nate

Brian, Thank you!!! We last spoke in November about some upgrades for my 2011 MX5 soft top. It has finally warmed up in NE Ohio and two relaxed weekends of wrenching on my car were well worth the effort. Installation of the RoadsterSport ceramic coated street header was straight forward and took under 8 hours, including a 40 minute test drive and cleanup of the garage! Combined with the RoadsterSport Q exhaust, the sound is fantastic and the increased torque, horsepower and performance make it a blast to drive. The addition of the Cobalt shock tower brace, Racing Beat sway bars, ILM front power train and X braces really enhanced the ride - minimal body roll, comfortable and very responsive. Your recommendations really helped transform the car from great to fantastic. Your research, product development and candid recommendations make you a standout in the industry. My only questions are - what's next on my list .... And how soon will my wife want the same upgrades on her 2012 PRHT ... Again, thank you!!! Charles G

-- Charles