I had lots of clunking from original A-60 pulling forward and aft and zero brake pressure. Removed old unit and replaced with UFP Dexter 34044 inner member, bleed the brakes and works perfectly now!
This is who I ordered the unit from https://www.trailerandtruckparts.com...-20_p_557.html
You have to be careful to note 1 or 2 axles and drum or disc brakes!
Cheers