Hello everyone.
A while ago, I replaced the front brake caliper pistons on my XR BAJA (Honda XR250 BAJA) with Kashima-coated ones.
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XR250 Brake Caliper Pistons: Swapping to Yamaha Kashima-Coated Pistons
Swapping the XR250 BAJA (MD30) brake caliper pistons for Yamaha Kashima-coated ones: size check, weight (44.6 g vs 17.0 g) and Metal Rubber.
The rear still has the original pistons, though, so I decided to measure the caliper and the Kashima-coated piston I'd already got ready.
First, the diameter of the piston bore in the caliper: 26.95 mm.
The outside diameter of the Kashima-coated piston I got ready: 26.87 mm.
So it should slide in without any trouble.
Next, the length (or should I say height?).
The depth of the caliper bore is 31.74 mm.
The height (or length?) of the piston is 27.05 mm.
Hmm. If I remember correctly, the original rear caliper piston is 31 mm long, so this one is 4 mm shorter.
Even with worn pads, the piston won't pop out, but...
I need to think about this a bit more.
I explain how I clean the caliper pistons (pushing them out and back to clean them) in this article.
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How to Clean and Work a Motorcycle Rear Brake Piston (BMW G650GS)
How I cleaned and worked the rear brake caliper piston on my BMW G650GS: pushing it out with the pedal, wiping it with Kimwipes, turning it with piston pliers, Metal Rubber, and safety checks afterwards.
