Brake Caliper Rebuild - Front

Complete rebuild of front brake calipers on a 2008 Dodge Viper, including disassembly, cleaning, seal replacement, and bleeding.

Warnings

Tools required

Parts

• Front brake caliper rebuild kit (includes pistons, seals, dust boots, and hardware) × 2 — Use OEM Mopar or equivalent Brembo kit for Gen IV Viper
• Copper crush washers for brake line banjo bolts × 4 — Use OEM specification

Fluids

• brake — 1 qt

Preparation

1. Park vehicle on level surface and set parking brake firmly.
2. Place wheel chocks behind rear wheels.
3. Loosen front wheel lug nuts while vehicle is on ground, but do not remove.
4. Lift front of vehicle with floor jack at manufacturer-specified jacking points and support securely on jack stands.
5. Remove front wheels completely.
6. Verify jack stands are stable and vehicle cannot shift before working underneath.
7. Open brake fluid reservoir cap slightly to allow fluid displacement during caliper work.
8. Prepare clean workspace with lint-free surface for caliper disassembly.

Procedure

1. 1

   Remove brake caliper from vehicle
   Using a box wrench or socket, carefully loosen the brake line banjo bolt at the caliper inlet. Position a drain pan or container beneath to catch brake fluid. Once loosened, remove the banjo bolt completely and immediately plug the brake line with a rubber cap or clean rag to prevent fluid loss and contamination. Remove and discard the two copper crush washers from the banjo bolt. Locate the two fixed caliper mounting bolts securing the caliper to the steering knuckle/mounting bracket. Remove these bolts and carefully lift the caliper away from the rotor and mounting bracket. Support the caliper and move it to your clean workspace.
2. 2

   Separate caliper halves if applicable
   The Brembo calipers on the 2008 Viper are typically multi-piece designs. Inspect your specific caliper to determine if it consists of bolted-together halves or a single-piece body. If your caliper has through-bolts connecting two halves, remove these bolts and carefully separate the halves. Keep all hardware organized by location. If the caliper is a single-piece design, proceed directly to piston removal.
3. 3

   Remove caliper pistons
   Place the caliper body on a clean workbench with a folded towel or wooden block behind the piston opening to cushion it. Apply low-pressure compressed air to the brake fluid inlet port. The air pressure will gradually push the piston(s) out of the bore. Control the piston with your hand as it begins to move; do not allow it to fly out forcefully. This is an opposed-piston caliper with pistons on both sides of the rotor slot; if the caliper was not split into halves, use wooden shims to retain the opposing pistons while carefully applying air to eject one piston at a time. Once the piston is partially extended, you may be able to grip and twist it out by hand. Remove all pistons from the caliper body.
   ⚠Use only low air pressure (20-30 PSI maximum). High pressure can eject pistons violently causing injury. Keep fingers clear of piston path.
4. 4

   Remove old seals and clean piston bores
   Using a plastic or wooden seal pick from your seal pick set, carefully pry out the square-section piston seals from their grooves in the caliper bores. Work gently to avoid scratching the bore surface; any scoring can cause seal leaks. Remove the dust boots if not already removed with the pistons. Thoroughly spray all caliper internal passages, bores, and fluid ports with brake parts cleaner. Use a brass wire brush to clean any rust or deposits from non-sealing surfaces, being extremely careful not to touch polished bore surfaces. Wipe everything clean with lint-free rags. Inspect piston bores carefully for any scoring, pitting, or corrosion. Minor staining is acceptable, but any grooves or scratches that you can catch with a fingernail indicate the caliper body should be replaced or professionally honed.
   ⚠Never use metal picks or steel wire brushes on piston bores or sealing surfaces. Even minor scratches will cause seal failure and fluid leaks.
5. 5

   Inspect and clean pistons
   Clean each piston thoroughly with brake parts cleaner and inspect carefully. Check for scoring, pitting, rust, or chrome plating damage on the outer surface. The piston outer diameter must be perfectly smooth; any defects require piston replacement. Check that pistons match the replacements in your rebuild kit. Clean the piston interior cavity and check for corrosion. Minor surface rust inside is acceptable as this area does not seal, but heavy corrosion weakens the piston. If pistons are in good condition, you may reuse them; otherwise use the new pistons from the rebuild kit.
6. 6

   Install new piston seals
   Pour a small amount of fresh brake fluid of the manufacturer-specified DOT rating into a clean container. Dip your fingers in the fluid and coat the inside of each piston bore with a thin film of fluid. Take a new square-section piston seal from the rebuild kit and coat it thoroughly with brake fluid. Carefully work the seal into its groove in the caliper bore, ensuring it seats evenly all the way around with no twists or folds. The seal should sit completely below the bore surface. Repeat for all piston bores. Do not use petroleum-based grease or lubricants on seals; use only fresh brake fluid or the special assembly fluid provided in some kits.
7. 7

   Install dust boots and pistons
   If your caliper design uses dust boots that install in the caliper body first, fit them into their grooves in the caliper bore now. Coat each piston generously with fresh DOT 4 brake fluid. Carefully align the piston with its bore and press it squarely into the bore opening by hand. The piston should slide in smoothly with light pressure once it engages the seal. Press the piston approximately halfway into the bore. If the dust boot installs on the piston after insertion, stretch the boot over the piston now and seat it in both the piston groove and caliper body groove. Use a smooth plastic tool if needed to tuck the boot lip into place; do not use sharp tools. Repeat for all pistons.
8. 8

   Reassemble caliper halves if applicable
   If you separated the caliper into two halves in Step 2, clean the mating surfaces of both halves with brake cleaner. Check that any O-rings or seals between the halves are present in the rebuild kit and install them in their grooves with a light coating of brake fluid. Carefully align the caliper halves and bring them together, ensuring any internal fluid passages line up correctly. Install the through-bolts and tighten evenly in a cross pattern. Torque these bolts to specification if known; if specification is unavailable, tighten firmly and evenly, ensuring halves are pulled together with no gap.
   ℹ️Caliper half through-bolts are critical structural fasteners. Ensure they are fully tightened to prevent caliper separation under braking force.
9. 9

   Prepare caliper slide pins and hardware
   The 2008 Viper front caliper is a fixed opposed-piston design and does not use slide/guide pins; there is no slide-pin hardware to service. Skip this step and proceed to caliper installation.n the caliper bracket where the pins slide. Apply a thin coat of high-temperature brake grease to the slide pin shafts. Install new pin boots if provided in the rebuild kit, and reinstall the pins in their bores.
10. 10

    Install rebuilt caliper on vehicle
    Ensure the brake rotor surface is clean and free of contamination. Position the rebuilt caliper over the rotor and align it with the mounting bracket. Install the caliper mounting bolts and tighten them securely. If torque specification is known, torque to specification; otherwise ensure bolts are tightened firmly. Install new copper crush washers on the brake line banjo bolt (one on each side of the banjo fitting). Position the brake line banjo fitting against the caliper inlet and install the banjo bolt. Tighten the banjo bolt securely but do not overtighten as this can crack the caliper body or deform the washers.
    ⚠Always use new copper crush washers on banjo bolt connections. Reusing old washers will result in brake fluid leaks.
11. 11

    Bleed brake caliper
    Locate the brake bleeder screw on the caliper (typically on the top or rear). Clean around the bleeder screw to prevent contamination. Attach a clear hose to the bleeder screw and place the other end in a container partially filled with fresh DOT 4 fluid. Have an assistant pump the brake pedal several times and hold pressure, or use a vacuum bleeder according to its instructions. With pedal pressure held, open the bleeder screw 1/4 to 1/2 turn. Fluid and air will flow through the hose. Close the bleeder screw before the pedal reaches the floor, then release pedal pressure. Repeat this process until only clear, bubble-free fluid flows from the bleeder. Check the master cylinder reservoir frequently and maintain fluid level above the MIN mark; never let it run empty. When complete, tighten the bleeder screw securely and remove the hose.
    ⚠️If the master cylinder runs dry during bleeding, air will enter the ABS system and require special bleeding procedures. Monitor reservoir level constantly.
12. 12

    Repeat procedure for opposite side
    Perform Steps 1 through 11 on the opposite front caliper. Work methodically and do not rush. Ensure both calipers are rebuilt to the same standard.
13. 13

    Perform final brake system bleeding
    After both front calipers are installed and individually bled, perform a complete brake system bleed following the factory-specified sequence for the 2008 Viper (verify sequence in the service manual before proceeding). This ensures all air is purged from the system. Top off the brake fluid reservoir to the MAX line with fresh DOT 4 fluid. Reinstall the reservoir cap securely.
14. 14

    Reinstall wheels and perform pedal test
    Reinstall both front wheels and hand-tighten the lug nuts in a star pattern. Lower the vehicle until the wheels just contact the ground but most weight is still on the jack stands. Torque the lug nuts to specification in a star pattern. Fully lower the vehicle and remove jack stands. Before moving the vehicle, pump the brake pedal several times to seat the caliper pistons against the rotors. The pedal should become firm. Check underneath for any signs of brake fluid leaks at caliper connections.

Reassembly

1. Wheels are torqued in a star pattern to manufacturer specification.
2. All caliper mounting hardware is tightened securely.
3. New copper crush washers are installed on all brake line banjo bolts.
4. Brake system is fully bled and reservoir is filled to MAX line with fresh DOT 4 fluid.

Verification

• With engine off, pump brake pedal firmly 10-15 times. Pedal should become firm and hold steady pressure without sinking.
• Start engine. Pedal may drop slightly but should remain firm. No pedal sinking to floor.
• Inspect all caliper connections, bleeder screws, and banjo bolts for any sign of brake fluid leakage.
• Test drive in safe area at low speed. Brakes should engage smoothly with no pulling to either side.
• Perform several moderate-force stops from 30 mph to bed in new seals. Braking should feel confident with no sponginess.
• After test drive, re-inspect all connections for leaks and check brake fluid level.
• If pedal feel is not firm or if any leaks are present, DO NOT DRIVE THE VEHICLE. Repeat bleeding procedure or seek professional service.

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