Removing and installing brake caliper piston (1LA / 1LJ) — AUDI

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018); platform code 4X

• Opens: brake fluid

Don't miss

• Take care not to damage paint coating on brake caliper.Take care not to damage cylinder surface.
• Install all parts supplied in repair kit.Use only methylated spirits to clean the brake components.The brake caliper must be replaced if a brake caliper piston or piston bore is damaged.
• The surfaces of the brake caliper piston and seal must be cleaned only with methylated spirits and then dried.
• Risk of damage to protective cap and seal.Take care to keep brake caliper piston straight. — Press brake caliper piston lightly against protective cap.

📋 Procedure

1. Remove brake caliper and disconnect from hydraulic system .
2. Clamp brake caliper in jaws of vice. Use protective jaw covers. [Note: Take care not to damage paint coating on brake caliper.Take care not to damage cylinder surface.]
3. ⚠ Risk of injury.Wear safety goggles.When pressing out brake caliper piston, DO NOT reach into brake caliper with your fingers.Place a cloth over bore in brake caliper to catch any brake fluid spatter. Wrap another cloth tightly around nozzle of compressed-air gun applied to brake caliper.Always wear chemical-resistant protective gloves to prevent brake fluid from contacting skin. — Place a piece of wood in the caliper to prevent damage to the piston when it is forced out.
4. Apply compressed air nozzle to threaded hole for brake hose (arrow) and press piston out of caliper.
5. Lever protective cap off brake caliper using removal wedge3409.

6. Remove seal using removal wedge3409. [Note: Install all parts supplied in repair kit.Use only methylated spirits to clean the brake components.The brake caliper must be replaced if a brake caliper piston or piston bore is damaged.]
7. The surfaces of the brake caliper piston and seal must be cleaned only with methylated spirits and then dried.
8. Before inserting, apply thin coat of lithium grease to brake caliper piston and seal.
9. Insert inner seal into groove (arrow) in brake caliper.
10. Push protective cap onto brake caliper housing and press it in so that it makes contact all round.
11. ⚠ Risk of damage to protective cap and seal.Take care to keep brake caliper piston straight. — Press brake caliper piston lightly against protective cap.
12. Inflate protective cap using nozzle of compressed air gun (maximum 3 bar).
13. Press brake caliper piston into caliper using piston resetting appliance T10145.
14. Install brake caliper .

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