Sally posted the pictures of a gruelling hike to her Instagram page.
Sally captioned the first picture: "Top of Scafell Pike today, training for Everest @preventbreastcancer."
Top of Scafell Pike today, training for Everest.
Family and fans rushed to comment on her post.
Sally's daughter Phoebe, who is also an actress, said: "So proud!!!"
One fan wrote: "Well done Sally."
A second added: "Go super Sal!"
Sally posted a second photo of the team she will be climbing with.
Earlier this year, Sally announced she will be walking to Everest Base Camp to raise money for the charity Prevent Breast Cancer.
In November 2009, the actress was diagnosed with breast cancer, the same year as her Corrie character.
Sally underwent chemotherapy and radiotherapy for her cancer and after a six month break from the soap, she returned in July 2010.
Brooke joined Coronation Street in 2004.
Helen Flanagan, who plays Sophie's sister Rosie Webster, is also still on maternity leave from the birth of her second daughter, Delilah.
Brooke announced earlier this year that she was expecting her first baby with Sheffield United player Kean Bryan.Brooke's baby shower was attended by many of her Corrie co-stars including Sally, Lucy Fallon, cousin Ellie Leach, Colson Smith and Jennie McAlpine.
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