The shear strength of the brake pad is not enough, the brake pad material is not good or the pressing process is not good.

In addition, brake pads that overheat at high speeds or under continuous braking conditions are prone to cracking.

Cracked brake pads are recommended to be replaced in time.


Source: 1998 Honda Accord was cracking brake pads.
This video shows why the pads were cracking and what I did about the problem.

Solutions:
Comments 1: This is a typical result of rust and corrosion on brake pads. I’d suggest looking for galvanized brake pads as they are highly rust resistant and won’t succumb to the elements like the pads you used did.

Comments 2: Seen this on the rear of a 99 Town car. I broke up with the guy so I don’t know whether it came back.
Your radius rods are on opposing sides dude. like really look up the 51352 s84 a01 vs 51362 s84 a01 on the official Honda accord diagram call them to confirm. you can buy the parts used mislabeled by the handful from totaled cars. really quite common.

Comments 3: Brake lining is generally composed of a steel plate, adhesive heat insulation layer, and friction block, and the steel plate is painted to prevent rust.

The heat insulation layer is made up of non-heat transferring material for the purpose of heat insulation.

The friction block is composed of friction material and adhesive, which is squeezed on the brake disc or brake drum to produce friction when braking, so as to achieve the purpose of vehicle deceleration and braking.

Due to the friction, the friction block will be gradually worn out, and generally speaking, the lower the cost of the brake pad, the faster it will wear out.