How to Patch Mortar on Brick Walls
Pack in more mortar after the first batch of mortar is stiff.
Use a wheel rake or jointer to add more mortar.
Tip: Sometimes there are irregular or decorative shapes to mortar joints and some require different tools. When you buy your supplies, talk to the salesperson to find out what you need to make your repair. A rough sketch or photo of the surface will help you explain what you have.