SOURCE

1. The part number of the used repair kit for AUTOFREN SEINSA support is D4835
2. The part number of KASHIYAMA brake pads is D1011

Old rusty supports barely worked: brackets did not move, pistons were seized.
It's necessary to restore them.

INFO: In our supports, a so-called 'floating' bracket with a system of two opposing pistons is used.

First, a pair of contract spare supports was purchased for parts. As it turned out, they had to assemble two functioning supports from four partially working ones. It turned out not in vain — on the purchased supports, despite functional components, three out of four pistons were corroded. But the guides on them were intact compared to those that were installed on my car.

INFO: Change brake fluid once a year and keep the guides lubricated, friends! And such issues won't occur!

On the second purchased support instead of rubber bushings for guides was this kind of construction — a metal sleeve with a bellows dust cover. In my unprofessional opinion, this design is even better than the factory one due to several reasons:
a) With proper maintenance, sleeves can last forever and don't require replacement unlike rubber ones.
b) Standard dust covers are easily available even in a junkyard shop.
c) Such a dust cover has extra travel length, secures itself on the guide and keeps lubricant throughout its length, unlike the factory 'naked' design.

After disassembling the support it was cleaned from rust and repainted. This time I got lazy and used spray paint but to keep consistency also in black color. Spray paint is acrylic that can be applied directly over rust.

INFO: Be sure to degrease the surface before painting and cover all working holes with masking tape: under the piston, brake line fitting, and bleed nipple.

The result after overhaul looks like this:

Brake tubes are now made practically in every city