Puspakom test are a pain in the...
What we usually recommend for our customer after checking.
Replace whatever is defective.
Tighten the rear brake until is barely spinning freely. (After the test, please release the rear brake to proper specs)
Drop the rear pressure until 18-20 PSI.
And if you got stuff in the car that are heavy, please remove it.
Usually, we tighten the rear untill you barely can pull on the handbrake ie 1-2 click only.
Your mechanic should know how to get this.
Cannot Pass Puspakom Test., Puspakom Test Rear Brake Failed