Brake Caliper Rebuild - Front

Complete rebuild of front brake calipers including disassembly, inspection, seal replacement, piston cleaning, and reassembly with proper lubrication and bleeding.

Warnings

Tools required

Parts

• Front brake caliper rebuild kit (seals, dust boots, hardware) × 2 — Use OEM Mopar or equivalent performance brake kit
• Silicone brake caliper grease (high-temperature) × 1 — Use OEM specification
• Brake parts cleaner (non-chlorinated) × 1 — Use OEM specification
• Thread locker (medium strength) × 1 — Loctite 243 or equivalent

Fluids

• DOT 4 brake fluid — 1 qt

Preparation

1. Park vehicle on level surface and set parking brake firmly
2. Loosen front wheel lug nuts while vehicle is on ground but do not remove
3. Raise front of vehicle using floor jack at designated lift points and secure with jack stands rated for vehicle weight
4. Remove front wheels completely and set aside
5. Locate brake fluid reservoir under hood and check fluid level - mark current level for reference
6. Prepare clean workspace with all tools, parts, and fluids organized and accessible
7. Have fire extinguisher nearby as brake fluid is flammable
8. Clean exterior of brake caliper and surrounding area with brake cleaner to prevent contamination during rebuild

Procedure

1. 1

   Remove Brake Caliper from Vehicle
   Open bleeder screw slightly to relieve pressure. Disconnect brake line from caliper using flare nut wrench - cap line immediately to prevent fluid loss and contamination. Remove the two caliper mounting bolts securing the fixed caliper to the steering knuckle. Lift caliper off rotor. Note: the Viper uses a fixed opposed-piston (Brembo) caliper, not a floating/slide-pin design. Plug caliper inlet port with clean rubber cap or wrap in plastic to prevent fluid leakage during rebuild.
2. 2

   Disassemble Caliper Body
   Place caliper on clean workbench. Note this is a fixed opposed-piston caliper with multiple pistons on both sides of the bore. Remove each dust boot retaining ring if present using a pick tool and peel back the boots. To extract pistons, retain the pistons on one side with a clamp/spacer while applying LOW pressure compressed air (maximum 30 PSI) to drive out the opposite pistons one at a time, keeping fingers clear. Once all pistons are removed, use a pick tool to carefully remove each piston seal from its groove without scratching the bore.ton path. Once piston is removed, use pick tool to carefully remove piston seal from groove inside caliper bore - avoid scratching bore surface.
   ⚠Do not place fingers in front of piston during air pressure removal. Use wood block or towels only. Piston can eject with significant force.
3. 3

   Clean and Inspect Caliper Components
   Thoroughly clean caliper bore, piston, and all internal passages using brake parts cleaner and lint-free towels. Use non-metallic brush to remove any corrosion or buildup in bore. Inspect caliper bore for scoring, pitting, or corrosion - any damage deeper than 0.001 inch requires caliper replacement. Inspect piston for scoring, chrome loss, or corrosion - replace piston if any defects found. Check piston diameter and bore diameter with micrometer if available to verify clearance is within specification. Clean bleeder screw threads and inspect for damage. Blow out all internal passages with compressed air to ensure no debris remains.
   ℹ️Caliper bore must be smooth and free of defects. Any scoring visible to fingernail means caliper body must be replaced - honing is not recommended for brake calipers.
4. 4

   Inspect Caliper Bracket and Hardware
   With caliper removed, inspect caliper mounting bracket on vehicle for cracks, wear, or damage. Check slide pins for wear, corrosion, or binding - they should move smoothly in bracket bores. Clean slide pin bores thoroughly with brake cleaner. Inspect brake pads for remaining thickness and uneven wear patterns. Measure rotor thickness and check for scoring or heat damage. The Viper uses high-performance rotors that should be replaced if below minimum thickness or showing significant wear.
   ℹ️While caliper is off, this is optimal time to replace brake pads and inspect/replace rotors if needed. Consider replacing as preventive maintenance on a performance vehicle.
5. 5

   Install New Piston Seal
   Coat each new piston seal from the rebuild kit with clean DOT 4 brake fluid. Carefully install seal into groove in caliper bore using fingers only - do not use tools that could damage seal. Ensure seal is seated completely and evenly in groove with no twists or folds. Verify seal sits below surface of bore and is not pinched or protruding.
   ⚠Do not use petroleum-based lubricants on brake seals - only use clean brake fluid or silicone brake grease as specified. Petroleum products will swell and destroy rubber seals.
6. 6

   Install Piston and Dust Boot
   Coat piston and caliper bore generously with clean DOT 4 brake fluid. Install new dust boot onto piston first, seating it in piston groove. Carefully insert piston into caliper bore at a slight angle, then straighten as it enters to avoid damaging seal. Push piston in slowly and evenly using hand pressure or caliper piston tool. Piston should slide in smoothly - if resistance is felt, remove and check for seal damage or debris. Once piston is fully seated, install dust boot outer edge into caliper body groove. Install dust boot retaining ring if equipped, ensuring it seats fully.
   ℹ️Piston should move smoothly without binding. Any resistance indicates misalignment or seal damage - do not force.
7. 7

   Lubricate Slide Pins and Hardware
   This vehicle uses a fixed opposed-piston caliper and has no slide pins. Skip slide-pin lubrication. Instead, clean and inspect the pad retaining pins/clips and anti-rattle hardware, and apply a thin coat of high-temperature brake grease to pad backing plate contact points and hardware clips per rebuild kit instructions - do not use excessive grease and keep grease off friction surfaces.er rebuild kit instructions.
   ℹ️Only use silicone-based brake grease on slide pins. Do not use standard lithium grease which will melt at brake operating temperatures.
8. 8

   Reinstall Caliper to Vehicle
   Remove plugs or caps from brake line and caliper inlet port. Position caliper over brake rotor and align with mounting bracket. Insert and hand-thread both caliper-to-knuckle mounting bolts with medium-strength thread locker applied. Torque the caliper mounting bolts evenly to specification per the factory service manual. Reconnect brake line to caliper inlet using new copper crush washers if equipped - torque to specification if torque value is provided, otherwise tighten securely with flare nut wrench. Ensure brake line is not twisted or kinked.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
9. 9

   Bleed Brake Caliper
   Fill brake fluid reservoir to MAX line with fresh DOT 4 brake fluid. Attach clear tubing to bleeder screw and route into catch bottle partially filled with brake fluid. Have assistant pump brake pedal 3-4 times and hold pressure. Open bleeder screw 1/2 turn while assistant maintains pedal pressure - fluid and air will flow through tubing. Close bleeder screw before assistant releases pedal. Repeat process until fluid flows with no air bubbles. Torque bleeder screw to specification on final closure. Top off brake fluid reservoir to MAX line.
   ⚠Never allow brake fluid reservoir to run dry during bleeding or air will enter ABS system requiring professional scan tool to purge.
   Torque spec

   Bleeder Screw10 Nm (7 lb-ft)
10. 10

    Repeat for Opposite Side
    Perform steps 1 through 9 for the opposite front caliper, working methodically and ensuring all components are properly cleaned, inspected, and assembled. Maintain same attention to cleanliness and proper seal installation. Bleed second caliper using same procedure until no air bubbles are present in fluid flow.
    ℹ️Working on one caliper at a time allows you to reference the other side if questions arise during assembly.
11. 11

    Final Brake System Bleeding
    After both front calipers are rebuilt and individually bled, perform final system bleeding in the sequence specified by the factory service manual for this vehicle (verify the correct wheel order; generic farthest-from-master-cylinder order may not apply to the Viper's brake circuit configuration). At each wheel, pump brake pedal and bleed until clean fluid with no air flows. Check brake pedal feel - it should be firm with no sponginess. If pedal is soft, continue bleeding process. Top off brake fluid reservoir to MAX line with fresh DOT 4 fluid.
    ⚠Brake pedal MUST feel firm before driving vehicle. Soft or spongy pedal indicates air in system - continue bleeding until firm pedal is achieved.
12. 12

    Reinstall Wheels and Perform Safety Check
    Reinstall front wheels and hand-thread all lug nuts. Lower vehicle until wheels just contact ground to prevent rotation. Torque lug nuts to specification in star pattern. Fully lower vehicle and remove jack stands. With vehicle still in park/gear and parking brake set, pump brake pedal firmly 10-15 times to seat pads against rotors and ensure proper piston positioning. Check brake fluid level and add if needed. Inspect all brake line connections and caliper areas for any signs of fluid leakage.
    ⚠️DO NOT drive vehicle until brake pedal is firm and you have verified brakes operate correctly in a safe area. Perform low-speed brake test in driveway or parking lot before road use.
    Torque spec

    Wheel Lug Nuts142.4 Nm (105 lb-ft)

Reassembly

1. Torque all fasteners to specifications using calibrated torque wrench
2. Ensure all brake line connections are tight and leak-free
3. Verify brake fluid reservoir is at MAX line with fresh DOT 4 fluid
4. Double-check that all bleeder screws are closed and torqued properly
5. Confirm dust boots are properly seated on pistons and slide pins
6. Clean any brake fluid residue from painted surfaces immediately with water

Verification

• Start engine and pump brake pedal - pedal should be firm and high, not spongy or low
• With engine running, hold firm pressure on brake pedal for 30 seconds - pedal should not sink
• Perform low-speed brake test in safe area (5-10 mph) to verify brakes engage smoothly and evenly
• Check for any fluid leaks around caliper bodies, brake lines, and bleeder screws with vehicle on ground
• Verify no brake warning lights are illuminated on instrument cluster
• Perform several moderate brake applications from 30-40 mph in safe area to bed pads and verify even braking with no pulling
• After test drive, recheck all caliper mounting bolts and brake line connections for tightness
• Recheck brake fluid level after test drive and top off if needed - some fluid may be drawn into system during pad bedding
• Before returning to normal service, make several firm stops from highway speed in safe area to fully bed pads (avoid lockup)

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