Remove and replace the brake master cylinder, then bleed the entire brake system to restore proper hydraulic brake function.

Warnings

Tools required

Parts

• Brake master cylinder × 1 — Use OEM Toyota part number for 2.5L Camry
• Brake fluid reservoir cap gasket (if damaged) × 1 — Inspect during removal

Fluids

• DOT 3 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level ground and set parking brake firmly
2. Place wheel chocks behind rear wheels
3. Open hood and locate brake master cylinder on driver side firewall
4. Spread absorbent pads or towels under master cylinder area to catch fluid spills
5. Use turkey baster or fluid extractor to remove as much brake fluid as possible from reservoir
6. Prepare brake line plugs or small plastic caps to seal brake lines immediately after disconnection
7. Have fresh DOT 3 brake fluid ready but keep sealed until needed

Procedure

1. 1

   Disconnect brake lines from master cylinder
   Using a 10mm flare nut wrench, carefully loosen the two brake line fittings at the master cylinder. Work slowly to avoid rounding the soft brass fittings. Once loose, unthread by hand and immediately plug the open brake lines with caps to prevent fluid loss and air entry. Label lines (front/rear) if not obvious for reinstallation.
   Torque spec

   Brake Line Fittings15 Nm (11 lb-ft)
2. 2

   Disconnect brake fluid level sensor connector
   Locate the electrical connector on the brake fluid reservoir (usually on top or side). Press the release tab and disconnect the wiring harness from the fluid level sensor. Move wiring aside to prevent damage.
   ℹ️On some model years, the sensor may be integrated into the reservoir cap.
3. 3

   Remove master cylinder mounting nuts
   Locate the two mounting nuts securing the master cylinder to the brake booster on the firewall. Using a 12mm wrench, remove both nuts completely. Keep nuts in a safe location for reinstallation.
   Torque spec

   Master Cylinder Nuts25 Nm (18 lb-ft)
4. 4

   Remove master cylinder from vehicle
   Carefully pull the master cylinder straight away from the brake booster. The pushrod from the booster will separate from the back of the master cylinder piston. Keep the cylinder level to minimize fluid spillage. Place the old master cylinder in a drain pan. Inspect the booster pushrod for damage and measure its protrusion if specified in service manual.
   ⚠Do not allow brake fluid to contact painted surfaces. Wipe any spills immediately.
5. 5

   Prepare new master cylinder
   Remove new master cylinder from packaging. Transfer the fluid reservoir to the new cylinder if sold separately (most Toyota cylinders include reservoir). Verify the reservoir cap gasket is in good condition. Bench bleed the master cylinder before installation: secure cylinder in a vise, fill reservoir with DOT 3 fluid, install short bleed tubes from outlet ports back into reservoir, and slowly compress piston with a large screwdriver until no air bubbles emerge (typically 10-15 strokes).
   ℹ️Bench bleeding is CRITICAL. Failure to bench bleed makes system bleeding extremely difficult and may result in a spongy pedal.
6. 6

   Install new master cylinder
   Remove bleed tubes from bench-bled master cylinder and plug ports temporarily with fingers or plugs. Position the master cylinder onto the brake booster studs, ensuring the pushrod engages properly with the piston. Start both mounting nuts by hand, then torque evenly to specification. Do not overtighten as this can warp the cylinder body.
   ⚠Ensure pushrod is centered and fully engaged before tightening nuts. Misalignment can damage the piston.
   Torque spec

   Master Cylinder Nuts25 Nm (18 lb-ft)
7. 7

   Connect brake lines to master cylinder
   Remove plugs from brake lines and master cylinder ports. Thread brake line fittings into master cylinder by hand to avoid cross-threading. Once hand-tight, use 10mm flare nut wrench to tighten to specification. Verify lines are routed correctly and not kinked or twisted.
   ⚠Use flare nut wrench only. Standard wrenches will round off brass fittings. Do not overtorque.
   Torque spec

   Brake Line Fittings15 Nm (11 lb-ft)
8. 8

   Reconnect fluid level sensor
   Reconnect the electrical connector to the brake fluid level sensor on the reservoir. Ensure the connector clicks into place securely.
9. 9

   Fill brake fluid reservoir
   Open a fresh bottle of DOT 3 brake fluid. Fill the master cylinder reservoir to the MAX line. Keep the reservoir at least half full throughout the bleeding process to prevent air from entering the system.
   ⚠Use only fresh DOT 3 brake fluid from a sealed container. Contaminated or wrong fluid type can cause complete brake failure.
10. 10

    Bleed brakes in proper sequence
    Bleed brakes in this order: right rear, left rear, right front, left front (furthest to closest from master cylinder). At each wheel: locate bleeder screw on caliper, attach clear hose to bleeder and submerge other end in clean brake fluid in a container. Have assistant pump brake pedal 3-5 times and hold down. Open bleeder screw 1/2 turn, allow fluid and air to flow until stream stops, close bleeder before pedal reaches floor. Repeat until no air bubbles appear (typically 5-10 cycles per wheel). Check and refill reservoir frequently.
    ⚠️Never let reservoir run dry during bleeding or air will re-enter the system. Check level after every 2-3 bleeds.
    ⚠Pedal must be held down when bleeder is open. Releasing pedal while open draws air back into system.
11. 11

    Check brake pedal feel and system integrity
    With engine off, pump brake pedal firmly several times. Pedal should feel firm and high. If spongy or low, repeat bleeding process. Start engine (power assist active) and verify pedal remains firm and does not sink slowly. Inspect all brake line connections at master cylinder for leaks while assistant applies firm pedal pressure.
    ⚠️Do NOT proceed to test drive if pedal feels spongy, sinks, or requires excessive travel. Re-bleed system completely.
12. 12

    Perform final fluid level check
    With engine off and brakes cool, verify brake fluid level is between MIN and MAX marks on reservoir. Top off if needed with fresh DOT 3 fluid. Install reservoir cap and torque to specification (hand tight only - do not use torque wrench on plastic cap).

Reassembly

1. No disassembly was required beyond the master cylinder removal
2. Ensure all brake line connections are tight and properly torqued
3. Verify fluid level sensor connector is fully seated
4. Clean any brake fluid residue from firewall and components with water

Verification

• With engine running, brake pedal should be firm and high with normal travel of approximately 2-3 inches before significant resistance
• Pedal should not sink or lose firmness when held under steady pressure for 30 seconds
• No brake fluid leaks visible at master cylinder, brake lines, or wheel calipers
• Brake warning light on instrument cluster should be OFF with ignition on
• Perform multiple low-speed brake tests (under 10 mph) in a safe area to verify proper brake function before driving on public roads
• After road test, re-inspect all connections for leaks and verify fluid level has not dropped
• Brakes should apply evenly without pulling to either side

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