Caliper Rebuild
Short answer: Rebuilding a caliper is just replacing the seals — unless the piston bore is corroded/damaged, in which case it must be re-sleeved (~$35/piston, pricey). To bleed air from behind the pistons:
- Two-person: one pumps to a firm pedal and holds; the other opens the bleeder until the pedal drops, then re-tightens; repeat until fluid runs clear.
- One-person: run a clear tube from the bleeder into a bottle with ~1/4″ of fluid (tube submerged), open the bleeder, pump 4–5 times, refill the master, repeat until clear.
- Keep the bleeder at the highest point; tapping the caliper lightly with a hammer floats bubbles toward it.
Also check the proportioning valve — one member’s was sucking air without leaking fluid, defeating many bleed attempts.
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Content last modified: June 13, 2026 at 10:06 am
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