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Most brake calipers used in big brake kits have smaller piston sizes compared to stock calipers. Although braking performance increases overall, the result of the slight change in piston size gives a "softer" pedal feel and more travel with the factory master cylinder. Depending on the year, your Miata came with either a 7/8" or 15/16" master cylinder. The 1" master cylinder regains the firm and responsive brake pedal the Miata has with the factory calipers.
* Wilwood 1" piston master cylinder with twin reservoirs
* Master to booster adapter bracket
* Junction fitting and Tee fitting
* Hand-formable hard lines
* Nylon barb fittings and clear hose for bench bleeding
Note: Fits all years with or without ABS. Does NOT fit on the brake booster in 2004-2005 Mazdaspeed. To fit this in a Mazdaspeed Miata you will need to change to a brake booster from a Sport package 2001-2005 Miata.
Wow! On the road, upgrading to the 1" master cylinder was an immediate difference with a much firmer brake pedal and reduced pedal travel. However, on track is where this upgrade truly shines and the 1" master cylinder greatly improves feel and feedback from the brakes. I found the extra feedback gave me the confidence to consistently push deeper and deeper into braking zones. If you have a big brake kit this kit should be your next purchase, you won't regret it.