We remove the brake drum, the upper coupling spring and remove the upper stops of the brake pads from the pistons of the wheel cylinder (see Replacing the brake pads of the rear wheels).
For ease of unscrewing the brake pipe fitting..
... with an "8" ring wrench, we unscrew the bleed fitting from the cylinder.
Using a special key "10" for the fittings of the brake pipes, we unscrew the fitting of the brake pipe.
Putting a rag underneath..
... we remove the tip of the tube from the cylinder hole and close the tube hole with a protective cap from the bleeder fitting.
With a head or a "10" ring wrench, we unscrew the bolt securing the cylinder to the brake shield..
... and remove the cylinder from the hole in the shield of the brake mechanism.
During long-term operation of the car in the connection of the brake pipe with the fitting, they can "stick", as a result of which, when the fitting is unscrewed, the tube will rotate with it and deform.
In order not to damage the brake pipe, unscrew the bolt securing the wheel cylinder to the brake shield (see above) and take the cylinder together with the tube away from the shield.
We clamp the fitting of the brake pipe with a special "10" key for brake pipes and, rotating the cylinder with the help of sliding pliers, turn it off.
Install the new wheel cylinder in reverse order.
After assembling the brake (including drum installation) bleed hydraulic brakes (see Bleeding the hydraulic drive of the brake system).