How do you put brakes on craftsmen mower?

Check out page 25 of the manual for adjusting the brake. http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0203049.pdf If adjusting the brake doesn't work you may just need to disassemble the brake assembly and clean some of the parts to free them up. If everything is working properly you might have to replace the brake linings. The brake linings last a very long time.