Well, I guess it depends which way you are coming, but if you are driving passed Cardiff on the M4 I use:
Exit M4 at J35 take first exit for A473 to Bridgend
Down the dual carriage way, straight over the large round-about at the industrial estate.
Down some more dual carriage way
Straight across the next round-about with the A48, stay on the A473 heading due West.
Road is now single carriage way, straight over next small round about
Under railway bridge
At round about you can
A) carry on as if heading out of town, keep eyes left till you see what looks like a road or drive on the left that is blocked with great rocks, take next left (its quite close), single track road to offset crossroads/T-junction, and go right-then-left towards Merthyr Mawr
or
B) Turn south at roundabout onto B4265 to Ewenny, over railway, take first right just as you come into Ewenny, take next and only left before hitting the main road again!
If you can't follow the single track road all the way to the parking/camping area from there you really do need navigational help
To be honest, Merthyr Mawr is a lot easier to find to than Braziers is, as long as you don't go driving in circles around Bridgend...
please don't ask!