Complete rebuild of front brake calipers including disassembly, cleaning, replacement of seals and pistons, reassembly, and bleeding on a 2023 Rivian EDV 500 electric delivery vehicle.

Warnings

Tools required

Parts

• Front brake caliper rebuild kit (seals, boots, pistons) × 2 — Use OEM Rivian specification
• Brake caliper mounting hardware kit × 1 — Use OEM specification
• Copper crush washers for brake lines × 4 — Use OEM specification

Fluids

• DOT 4 Brake Fluid — 1 qt

Preparation

1. Review entire procedure before beginning work to ensure you have all necessary tools, parts, and skills
2. Park vehicle on level, solid surface and engage parking brake
3. Place wheel chocks behind rear wheels
4. Verify you have manufacturer's service information for brake system specifications and lift point locations
5. Locate and verify proper jacking points per Rivian service manual for EDV 500
6. Remove cap from brake fluid reservoir and check fluid level; mark initial level
7. Using brake fluid syringe or turkey baster, remove approximately half the brake fluid from reservoir to prevent overflow when pushing pistons back
8. Loosen front wheel lug nuts while vehicle is still on ground
9. Raise front of vehicle using appropriate lift points and secure on jack stands rated for vehicle weight
10. Remove front wheels completely
11. Inspect brake system for any damage, excessive wear, or contamination that would indicate caliper replacement rather than rebuild
12. Take photographs of brake assembly from multiple angles for reference during reassembly

Procedure

1. 1

   Remove front brake calipers
   Using flare wrenches, disconnect brake line from caliper while holding caliper-side fitting stationary. Immediately plug open line and caliper port with clean rubber plugs to prevent fluid loss and contamination. Remove caliper mounting bolts and carefully remove caliper from rotor. Note condition of mounting hardware and sliding pins. Place caliper on clean work surface. Repeat for second front caliper.
   ⚠Brake fluid will drain from disconnected lines. Have catch container ready and avoid spilling on painted surfaces.
   ⚠Do not let caliper hang by brake hose as this can damage the hose internally.
2. 2

   Disassemble calipers
   Place caliper on clean workbench with shop towels underneath to catch brake fluid. Remove dust boots from pistons carefully. Using compressed air applied gradually to brake fluid inlet port, pneumatically eject pistons from caliper bores. Keep fingers clear of piston path and use only low pressure initially. Once pistons are removed, use pick tools to carefully extract piston seals from grooves in caliper bores. Remove all rubber components and set aside hardware.
   ⚠️Pistons can eject with significant force. Never place fingers in front of piston. Use only low air pressure and increase gradually. Wear safety glasses.
   ⚠Do not scratch or gouge caliper bore walls when removing seals. Use plastic or brass picks only.
3. 3

   Inspect caliper components
   Thoroughly clean caliper body and all passages with brake parts cleaner. Inspect caliper bores for scoring, pitting, corrosion, or wear. Measure bore diameter and compare to specifications in service manual. Inspect pistons for chrome plating damage, scoring, or corrosion. If any component shows damage beyond light surface staining, the caliper must be replaced rather than rebuilt. Clean all bolt holes and mounting surfaces. Verify bleeder screws are not seized by attempting to open slightly.
   ℹ️Even minor scoring in caliper bores or piston surfaces can cause seal failure and brake fluid leakage. Err on the side of caution.
4. 4

   Clean and prepare caliper bores
   Using fine emery cloth or crocus cloth, lightly polish caliper bores to remove any surface staining or oxidation. Work in circular motion and keep surfaces smooth. Clean thoroughly with brake parts cleaner and dry with compressed air. Ensure all seal grooves are completely clean and free of old seal material. Clean piston contact surfaces similarly if reusing pistons, or prepare new pistons from rebuild kit by cleaning off any protective coating per kit instructions.
   ⚠Do not use coarse abrasives or remove material from bore surface. Only light polishing to restore smooth finish is acceptable.
5. 5

   Lubricate and install new seals
   Apply thin coat of clean DOT 4 brake fluid or supplied assembly lubricant to new piston seals from rebuild kit. Carefully install seals into caliper bore grooves, ensuring they seat properly without twisting. Work seals into place with clean fingers, ensuring they sit evenly in groove around entire circumference. Verify seals are not pinched or rolled.
   ⚠Use only brake fluid or supplied lubricant for seal installation. Never use petroleum-based lubricants which will destroy rubber seals.
6. 6

   Install pistons
   Coat new or cleaned pistons liberally with clean DOT 4 brake fluid. Carefully align piston with bore and push piston into bore by hand, ensuring it enters squarely and does not cock to one side. Push piston approximately halfway into bore. Verify piston moves smoothly without binding. If resistance is felt, remove piston and verify seal is properly seated and bore is clean.
   ⚠Piston must enter bore squarely to avoid damaging new seal. Never force a binding piston.
7. 7

   Install dust boots and complete assembly
   Install new dust boots from rebuild kit onto pistons per kit instructions. Some designs install boot to piston first, others to caliper bore first. Ensure boot seats properly in caliper groove and on piston. Push piston fully into bore to final position. Repeat piston and boot installation for all pistons in both calipers. Clean exterior of caliper and inspect all work.
   ℹ️Dust boot installation varies by caliper design. Refer to rebuild kit instructions for proper procedure.
8. 8

   Prepare calipers for installation
   Clean caliper mounting brackets and inspect sliding pins or guide pins for wear or corrosion. Replace mounting hardware if included in service kit or if wear is evident. Lubricate sliding pins with high-temperature brake grease per manufacturer specifications. Install new copper crush washers on brake line fittings. Verify bleeder screws are functional and clean.
   ⚠Seized or corroded sliding pins will cause uneven brake pad wear and reduced braking performance. Replace if questionable.
9. 9

   Install rebuilt calipers
   Position caliper over brake rotor and align with mounting bracket. Install caliper mounting bolts and tighten to manufacturer specifications using torque wrench. Connect brake line to caliper using new copper crush washers and tighten fitting with flare wrench to proper torque. Do not overtighten as this can damage fitting or line. Repeat for second caliper. Note: Without torque specifications in database, reference Rivian service manual for exact values.
   ℹ️Torque specifications not available in database. Consult Rivian factory service manual for proper torque values before proceeding.
10. 10

    Bleed brake system - initial bleeding
    Fill brake fluid reservoir to MAX line with fresh DOT 4 brake fluid. Beginning with the caliper furthest from master cylinder (typically passenger front on this vehicle), attach bleeder hose to bleeder screw and submerge other end in clean brake fluid in clear container. Open bleeder screw 1/2 turn. Have assistant slowly depress brake pedal to floor and hold. Close bleeder screw, then have assistant release pedal. Repeat until fluid flows without air bubbles. Keep reservoir topped off throughout process.
    ⚠️Never allow brake fluid reservoir to run dry during bleeding as this will introduce air into ABS system requiring scan tool bleeding procedure.
    ⚠Bleeding sequence is critical. Verify proper sequence in service manual for EDV 500 brake system configuration.
11. 11

    Complete brake bleeding procedure
    Continue bleeding remaining calipers in proper sequence per service manual. After manual bleeding is complete, brake pedal should feel firm. If pedal is soft or spongy, ABS modulator may contain air and require scan tool bleeding procedure. Top off brake fluid reservoir to MAX line. Clean any spilled brake fluid from components and painted surfaces immediately.
    ℹ️EDV 500 may require electronic scan tool to cycle ABS valves for complete air removal. Verify bleeding procedure completion with firm pedal before test drive.
12. 12

    Reinstall wheels and perform initial checks
    Reinstall front wheels and hand-tighten lug nuts in star pattern. Lower vehicle to ground and torque lug nuts to specification in star pattern. Pump brake pedal several times to seat caliper pistons against rotors. Check brake pedal feel - should be firm with normal travel. Inspect all brake line connections for leaks. Check brake fluid level and top off if needed. Inspect caliper area for any fluid leaks.
    ⚠️Do not attempt to drive vehicle until brake pedal is firm and no leaks are present.

Reassembly

1. Torque wheel lug nuts to Rivian specification in proper star pattern
2. Double-check all brake line connections are tight and leak-free
3. Verify brake fluid reservoir is filled to MAX line with fresh DOT 4 fluid
4. Ensure no tools or parts are left in wheel well or under vehicle
5. Clean any brake fluid residue from wheels, calipers, and painted surfaces

Verification

• With vehicle still stationary, pump brake pedal firmly 10-15 times and verify pedal becomes firm and holds pressure
• Start vehicle and verify brake warning light is not illuminated on instrument cluster
• Inspect caliper areas for any signs of brake fluid leakage around pistons or fittings
• Perform low-speed test drive (under 15 mph) in safe area to verify brakes engage smoothly and vehicle stops straight
• After initial test, inspect calipers again for any leaks and verify no unusual noises or vibrations
• Perform moderate brake application test at 25-30 mph in safe area, verifying even braking and straight-line stopping
• Final inspection of all work areas for leaks after test drive
• Check brake fluid level again after test drive and top off if needed
• Allow 200-300 miles of normal driving for complete break-in of rebuilt calipers before subjecting to hard braking
• Re-check brake fluid level and inspect for leaks after first 100 miles of driving

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