You must select your brand attribute in Theme Settings -> Shop -> Brands
Price range: $2.99 through $12.95
Price range: $9.99 through $24.99
Price range: $6.99 through $12.99
Price range: $4.99 through $25.95
Price range: $2.99 through $18.39
Price range: $10.00 through $35.00
Price range: $4.95 through $7.95
Price range: $1.99 through $49.95
Price range: $3.99 through $27.10
Price range: $6.50 through $18.00