A pad spacer is a tool used to keep disc brake pads separated when the wheel is removed from a bicycle.
Here's a more detailed explanation:
- Purpose: Its primary function is to prevent the brake pads from accidentally closing and becoming stuck together when the rotor (the disc attached to the wheel) is not present. This is especially important for hydraulic disc brakes.
- Why is this important? If the brake lever is accidentally squeezed while the wheel is off, the pistons in the brake caliper will move inward, causing the pads to close. Re-installing the wheel can then become difficult or impossible without resetting the pistons.
- How it Works: The pad spacer is typically a small, flat piece of plastic or metal that is inserted between the brake pads. It keeps them the correct distance apart, simulating the presence of the rotor.
- Additional Uses: Some pad spacers, like the VANICE pad spacer, can also be used to help reset the pistons on hydraulic brakes if they have become stuck or uneven.
In summary, a pad spacer is a simple but essential tool for anyone with disc brakes, ensuring easy wheel removal and preventing common maintenance headaches. It helps maintain proper brake function and prevents damage.
