The Following is a General Instruction File I Made for this Problem. Readjust the Brake Rods to the Original Positions. Now to Adjust the Brake Pads. Tighten the Center Adjusting Nut Until SNUG. Loosen the Adjuster Nut 1/8 Turn and Try the Brakes. If Braking is Not to your Satisfaction, then Adjust the Center Adjusting Nut on the Disc Brake Assembly Slightly (1/8" at a time) Until the Proper Braking is Achieved.
The Brake Assembly is on the Left Side of you Hydro Transaxle.
You can View the Husqvarna Model List at this Site Addy, http://www.partstree.com/parts/
and Click on the Husqvarna Logo. Now Enter the Model Numbers GTH 2448 T in the Search Box on the Left and Click Go. Now Select the Model of the Equipment you Wish to View. The GTH 2448 T 917.279260 has a Hydro transaxle Breakdown.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.