Replace a T-Maxx, SportMaxx, S-Maxx brake disc
Step 1 - Begin by removing the air filter. Loosen the 3x3GS on top of the brake cam and remove the brake lever from the brake cam. Remove the 3x10WM screw from the bottom of the carb linkage bell crank post, and lift the bell crank assembly off of the chassis (this is to provide access to the transmission).
Step 2 - Disconnect the rear drive shaft from the transmission output shaft by removing the 4x14.5 yoke pin. Slide the drive shaft back toward the rear, and leave the shaft attached to the rear differential. Remove the eight 3x12RM screws located in the chassis braces that secure the transmission to the chassis. Lift the transmission from chassis.
Step 3 - Loosen both caliper screws (equally) just enough to gain access to the yoke pin located inside of the blue hex brake adapter. Remove the yoke pin from the output yoke, and slide the output yoke (with the blue hex adapter) off of the output shaft. Remove the old brake disc from the brake calipers.
Step 4 - Insert the new brake disc between the two brake calipers, then slide the output yoke (with the blue hex adapter) through the brake disc and over the output shaft of the transmission. Note: The large hole located in the hex adapter must be aligned with the threaded hole in the output yoke, and with the hole in the output shaft. Secure the assembly with the 4x18.5 yoke pin. Note: the yoke pin must be inserted through the large hole of the hex adapter.
After assembly, readjust the brake calipers. Tighten each caliper screw until there is just a little bit of play between the calipers and the brake disc. The disc should spin freely with as little play as possible. Important: There should be an equal amount of threads showing on the caliper screws outside of the transmission case.
Brake disc installation complete
Install the transmission back onto the chassis
Step 5 - Set the transmission back onto the chassis, and secure it with the eight 3x12RM screws. Note: On the 4WD T-Maxx model, remember to reconnect the short female half shaft from the transmission with the short male half shaft from the front differential before securing the transmission to the chassis (see left pic). Reconnect the rear drive shaft to the output shaft of the transmission with the 4x14.5 yoke pin.
Step 6 - Set the carb linkage bell crank post assembly back onto the chassis (keying the post into the appropriate holes), and secure it with the 3x10WM screw. Insert the brake lever into the brake cam and tighten the 3x3GS. Install the air filter back onto the carburetor. This completes the procedure.
Note: Be sure to check the brake and radio trim adjustments before operating the truck. Adjust as needed for desired performance.