Delco 3400

Tools Required:
J 36474-75 mm Boot Seal Installer or
J 36475-80 mm Boot Seal Installer or
J 38453-86 mm Boot Seal Installer

Caliper Components (Delco 3400):

Remove or Disconnect
1. Fluid from the caliper.
2. Pad the interior of the caliper with clean shop towels.

WARNING: Do not place your fingers in front of the piston in an attempt to catch, or protect it when applying compressed air. This could result In serious Injury.

CAUTION: Use just enough air to ease the piston out of the bore. If the piston is blown out, even with the padding, It can be damaged.

Removing The Piston:

3. Piston (9).
^ Direct compressed air into caliper fluid inlet.
^ Use just enough air pressure to ease piston out of bore.

Removing The Piston Boot:

4. Boot (8).
^ Use care not to scratch housing bore.
5. Piston seal (10).
^ Do not use any type of metal tool.
6. Bleeder valve (11).

NOTE: Clean bleeder valve, caliper bore, caliper passages, and piston with denatured alcohol. Use dry, filtered, compressed air to dry parts and blow out passages.

NOTE: Inspect piston for scoring, nicks, corrosion, wear, and damaged chrome plating. Replace piston if any of these are found. Inspect caliper bore and seal groove for scoring, nicks, corrosion and wear. Use crocus cloth to polish out any light corrosion. Replace caliper if corrosion cannot be removed.

Install or Connect
1. Lubricate new piston seal, caliper bore and piston with clean brake fluid. Use care not to twist the seal.

Fig. 5 Installing Boot To Piston:

3. Boot (8) on piston (9).

Seating The Boot In The Housing:

4. Piston (9) and boot into caliper bore.
a. Push piston to the bottom of bore.
b. Seat boot in housing using tool No. J 36474, J 36475, J 38453 or equivalent.
5. Bleeder valve (11).
^ Tighten bleeder valve (11) to 13 Nm (115 inch lbs.).