"Don Young" wrote in message
...
Transmission pulley may be slipping on the transmission input shaft.
Transmission output (axles) may be slipping in the wheel hubs. Either may
be caused by broken keys. Transmission linkage may be bent, broken, loose,
or misadjusted so transmission is not properly engaged. There may be an
internal transmission problem.

Since the brake does not work that would indicate that input shaft pully
slippage is not the problem. Observing what does and does not rotate
should identify the problem site.
Don Young
wrote in message
oups.com...
I have had someone check both belts. The belt/pulley system is fine.
All the belts are tight, they also turn when the mower is running, but
the mower brake or gears dont work

Respectfully suggest that if someone has to ask about such basic things it
might be better, for them, to take it to repair shop? Probing around with
being knowledable etc. and possibly without the right tools COULD be
dangerous and possibly cause a more expensive repair?