Step 1: Remove the old mortar
Use a brick hammer and a chisel to remove the old mortar. Break back the mortar joints until you reach solid mortar or the mortar is strong. You should break back the mortar at least 3/4 - 1" so the new mortar will bond well to the brick. Replace any soft or decomposing bricks. Clean out any remaining loose mortar with a stiff wire brush, and then vacuum out the cracks between the bricks.
 Break back the mortar at least 3/4 - 1
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