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How to determine a piston dia.
How to figure out a piston diameter without removing it from the caliper.
- This method is for your convenience & a general guideline only, due to the variation of the original pistons, it's your assurance to "pop" the piston out of the caliper to actually measure it for accuracy.
- Applicable to aftermarket calipers and those not listed in our standard OE caliper offer matrix only.
- If you also purchase pistons, the piston must be removed from the caliper to measure the height.
For traditional internal boot fitment type piston.
1. Measure the flange diameter eg. 34.5mm
2. Add 3.5mm, the piston diameter=38mm
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For new style external boot fitment type piston.
1. Measure the flange diameter eg. 30.5mm
2. Add 7.5mm, the piston diameter=38mm
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