Stages of work
Remove or install the brake pads as described above.
Check the mobility of the pad in the shafts. If necessary, clean with a hard toothbrush or a medium slotted screwdriver and blow with compressed air. Do not damage the dust seals during work and do not move them from their place. Before installing the brake pads, apply a little lubricating paste (copper-containing) to the contact surfaces.
The brake calipers should have free play. If not, clean the sliding surfaces as described above and lightly lubricate with heat-resistant copper paste.
Checking brake pistons
Before checking the mobility of the brake piston, install a clamp with a wooden block on the brake caliper as a stop. This will protect the piston from damage - it will not be able to slide out of the cylinder completely. Of course, the opposite brake caliper must remain fully mounted.
Have your assistant gently press the brake pedal. If the piston is stuck, he should pump the pedal until it becomes free. Then press the piston into the cylinder with the pry bar. Repeat the procedure until the piston slides freely in the cylinder.
Note: If you are unsuccessful, it is better to have the caliper repaired in a specialized workshop.
Replacing the dust seal
Lift the dust boot away from the brake caliper and sliding piston with a bent welding wire or a small angle screwdriver. Be careful not to scratch the working surfaces of the sliding piston and cylinder!
Check if brake fluid is leaking from the cylinder. In this case, it is better to have the caliper repaired in a workshop.
Clean the sealing surfaces with denatured alcohol or clean brake fluid. Before you install the new seal, preserve the cleaned surfaces with brake cylinder paste (Ate, Bosch, Girling).
Carefully press the new dust seal onto the sealing surfaces, making sure it fits snugly.
Press the piston into the cylinder until it stops.
Install the brake pads as described above.
After completing the work, check the brake fluid level and the tightness of the brake system.
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