CMH Piston maintenance block 4X1 Shimano BLUE

Maintenance block to expose the caliper pistons, one by one, for cleaning and lube.

This is a block similar to the bleed block, but with one side stepped, so that when you "pump" the brake lever, the piston is allowed out but is stopped before it exits the caliper.

1. Install the maintenance block and pump the brake lever until the piston makes contact with the block.
2. You can remove the block and clean the piston with alcohol, then apply a little mineral oil to the side and push the piston back in.
3. Push back the piston using the appropriate CMH tool.
4. Reinstall the block the other way round and repeat the process to clean and lubricate the other piston. 

Compatible with calipers using D, H or N type pads.