Repair guides › Brakes

Check coaster brake arm

Back-pedal brake inside the rear hub. Pedaling backward expands a brake shoe in the hub.

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Tools

• Ball-end hex key set (1.5–10 mm): Park Tool HXS-1.2 Professional L-Shaped Hex Set ($$)

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Steps

1. Check the arm strap bolt on the chainstay is tight.
2. Back-pedal: wheel should lock smoothly.

Signs it needs doing

• Slips
• Grabs

Problems this fixes

• Brakes feel weak