{
  "glb": "/models/components/987/rbrakes.glb",
  "parts": [
    {
      "id": "rear-rotor-left",
      "node": "rearRotorLeft",
      "label": "Rear Brake Rotor — Left (299mm)",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "299 mm cross-drilled internally vented cast-iron disc with drum-in-hat parking brake surface. 299 x 20 mm on the basic Boxster/Cayman, 299 x 24 mm (4 mm thicker) on the S models (2009 Service Introduction).",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-rotor-right",
      "node": "rearRotorRight",
      "label": "Rear Brake Rotor — Right (299mm)",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "299 mm cross-drilled internally vented cast-iron disc with drum-in-hat parking brake surface. 299 x 20 mm on the basic Boxster/Cayman, 299 x 24 mm (4 mm thicker) on the S models (2009 Service Introduction).",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-caliper-left",
      "node": "rearCaliperLeft",
      "label": "Rear Brake Caliper — Left (4-Piston Monobloc)",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Fixed 4-piston aluminium monobloc caliper clamping the pads against the rear left rotor. Black anodized on base cars, red on S, yellow with PCCB. The parking brake is NOT in the caliper — it is a separate drum-in-hat system.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-caliper-right",
      "node": "rearCaliperRight",
      "label": "Rear Brake Caliper — Right (4-Piston Monobloc)",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Fixed 4-piston aluminium monobloc caliper clamping the pads against the rear right rotor. Black anodized on base cars, red on S, yellow with PCCB. The parking brake is NOT in the caliper — it is a separate drum-in-hat system.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brake-pads",
      "node": "rearBrakePads",
      "label": "Rear Brake Pads",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Friction pads that press against the rear rotors under hydraulic caliper clamping force. Release the hand-lever parking brake fully and retract pistons squarely before fitting new pads.",
      "componentId": "rbrakes"
    },
    {
      "id": "epb-actuator-left",
      "node": "epbActuatorLeft",
      "label": "Parking Brake Expander & Cable — Left",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Mechanical expander lever inside the left drum-in-hat, pulled by a Bowden cable from the cabin hand lever to spread the parking shoes against the hat drum. The 987 parking brake is fully cable-operated — no electric EPB motor (that arrived with the 981).",
      "componentId": "rbrakes"
    },
    {
      "id": "epb-actuator-right",
      "node": "epbActuatorRight",
      "label": "Parking Brake Expander & Cable — Right",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Mechanical expander lever inside the right drum-in-hat, pulled by a Bowden cable from the cabin hand lever to spread the parking shoes against the hat drum. The 987 parking brake is fully cable-operated — no electric EPB motor (that arrived with the 981).",
      "componentId": "rbrakes"
    },
    {
      "id": "wheel-speed-sensor-rear-left",
      "node": "wheelSpeedSensorRearLeft",
      "label": "Wheel Speed Sensor — Rear Left",
      "assembly": "Sensors",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Active wheel-speed sensor reading the rear-left tone ring and reporting rotational speed to the PSM control unit for ABS, ASR and stability interventions.",
      "componentId": "rbrakes"
    },
    {
      "id": "wheel-speed-sensor-rear-right",
      "node": "wheelSpeedSensorRearRight",
      "label": "Wheel Speed Sensor — Rear Right",
      "assembly": "Sensors",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Active wheel-speed sensor reading the rear-right tone ring and reporting rotational speed to the PSM control unit for ABS, ASR and stability interventions.",
      "componentId": "rbrakes"
    },
    {
      "id": "abs-psm-hydraulic-unit",
      "node": "absPsmHydraulicUnit",
      "label": "ABS / PSM Hydraulic Control Unit",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "PSM hydraulic modulator regulating brake pressure per wheel: 4-channel ABS, ABD, ASR, MSR and EBD, plus the 987.2's enhanced functions — brake pre-filling on fast throttle lift, hydraulic brake assist and drive-off assistant (2009 Service Introduction, doc p120–121).",
      "componentId": "rbrakes"
    },
    {
      "id": "brake-lines",
      "node": "brakeLines",
      "label": "Brake Lines (Hard & Flex)",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Hard steel lines and flexible hoses that route hydraulic brake fluid from the master cylinder through the ABS/PSM unit to each caliper.",
      "componentId": "rbrakes"
    },
    {
      "id": "brake-fluid-reservoir",
      "node": "brakeFluidReservoir",
      "label": "Brake Fluid Reservoir",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "primary",
      "partNumber": null,
      "function": "Translucent reservoir mounted on the brake master cylinder that stores and supplies DOT 4 brake fluid to maintain system pressure and compensate for pad wear.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-001",
      "node": "brakeMasterCylinder",
      "label": "Brake Master Cylinder",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Converts pedal force into hydraulic pressure that is transmitted through the brake lines to actuate all four calipers for braking.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-002",
      "node": "brakeServo",
      "label": "Brake Servo (Vacuum Booster)",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Vacuum booster between pedal and master cylinder. Boost ratio raised to i=5.0 for MY2009 with steel discs (i=4.5 with PCCB); the PSM adds hydraulic brake assist on top under full braking.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-003",
      "node": "rotorDustShieldLeft",
      "label": "Rear Brake Disc Cover Plate — Left",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Sheet metal splash shield mounted behind the rear rotor that deflects road debris and water away from the rotor, drum-in-hat shoes and caliper.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-004",
      "node": "rotorDustShieldRight",
      "label": "Rear Brake Disc Cover Plate — Right",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Sheet metal splash shield mounted behind the rear rotor that deflects road debris and water away from the rotor, drum-in-hat shoes and caliper.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-005",
      "node": "caliperSealRepairSet",
      "label": "Rear Caliper Seal Repair Set",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Piston seal and dust boot repair kit for the rear brake calipers, used when rebuilding calipers to restore hydraulic sealing and prevent fluid leaks.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-006",
      "node": "brakeFluid",
      "label": "Brake Fluid (DOT 4)",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "000.043.210.82",
      "function": "Hygroscopic hydraulic fluid that fills the brake system and transmits pedal force to the calipers; replaced every 2 years on the 987 maintenance schedule as its boiling point degrades.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-007",
      "node": "brakeHoseRear",
      "label": "Rear Brake Hose (Flexi)",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Flexible rubber hose that bridges the fixed hard brake line to the rear caliper, accommodating suspension movement while maintaining hydraulic pressure.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-008",
      "node": "padWearSenderWire",
      "label": "Brake Pad Wear Sender Wire — Rear",
      "assembly": "Sensors",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Electrical lead connecting the rear brake pad wear sensor to the vehicle wiring harness, triggering a dashboard warning when pad material reaches minimum thickness.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-009",
      "node": "caliperBracketBoltLeft",
      "label": "Rear Caliper Mounting Bolt — Left",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "999.067.053.09",
      "parent": "rear-caliper-left",
      "function": "High-strength socket-head bolt securing the rear fixed caliper to the wheel carrier; torqued to 85 Nm and replaced after removal.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-010",
      "node": "caliperBracketBoltRight",
      "label": "Rear Caliper Mounting Bolt — Right",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "999.067.053.09",
      "parent": "rear-caliper-right",
      "function": "High-strength socket-head bolt securing the rear fixed caliper to the wheel carrier; torqued to 85 Nm and replaced after removal.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-011",
      "node": "discRetainingScrewLeft",
      "label": "Brake Disc Retaining Screw — Left",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "900.269.047.01",
      "parent": "rear-rotor-left",
      "function": "Countersunk screw that locates the rear brake disc on the hub flange during assembly and prevents the disc from dropping when the wheel is removed.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-012",
      "node": "discRetainingScrewRight",
      "label": "Brake Disc Retaining Screw — Right",
      "assembly": "Rotors",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "900.269.047.01",
      "parent": "rear-rotor-right",
      "function": "Countersunk screw that locates the rear brake disc on the hub flange during assembly and prevents the disc from dropping when the wheel is removed.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-013",
      "node": "caliperBleederValveLeft",
      "label": "Rear Caliper Bleeder Valve — Left",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "997.352.919.00",
      "parent": "rear-caliper-left",
      "function": "Threaded bleed nipple on the rear caliper that allows air to be purged from the hydraulic circuit during brake bleeding; includes protective dust cap.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-014",
      "node": "caliperBleederValveRight",
      "label": "Rear Caliper Bleeder Valve — Right",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "997.352.919.00",
      "parent": "rear-caliper-right",
      "function": "Threaded bleed nipple on the rear caliper that allows air to be purged from the hydraulic circuit during brake bleeding; includes protective dust cap.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-015",
      "node": "bleederDustCapLeft",
      "label": "Bleeder Valve Dust Cap — Left",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "930.351.927.00",
      "parent": "caliperBleederValveLeft",
      "function": "Protective rubber or plastic cap that seals the bleed nipple thread from contamination when the brake system is not being bled.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-016",
      "node": "bleederDustCapRight",
      "label": "Bleeder Valve Dust Cap — Right",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": "930.351.927.00",
      "parent": "caliperBleederValveRight",
      "function": "Protective rubber or plastic cap that seals the bleed nipple thread from contamination when the brake system is not being bled.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-017",
      "node": "padAntiRattleSpring",
      "label": "Brake Pad Anti-Rattle Spring / Clip Set",
      "assembly": "Calipers",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Spring steel clips that tension the brake pads against the caliper abutments to eliminate pad rattle noise during light braking and normal driving.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-018",
      "node": "brakeLineHolderLeft",
      "label": "Rear Brake Line Holder — Left",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "brake-lines",
      "function": "Retaining clip that secures the rear brake hard line or flexible hose to the chassis or suspension arm to prevent vibration and chafing.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-019",
      "node": "brakeLineHolderRight",
      "label": "Rear Brake Line Holder — Right",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "brake-lines",
      "function": "Retaining clip that secures the rear brake hard line or flexible hose to the chassis or suspension arm to prevent vibration and chafing.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-020",
      "node": "rearBrakeLineLeft",
      "label": "Rear Brake Hard Line — Left",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "brake-lines",
      "function": "Steel hard line that routes pressurised brake fluid from the ABS/PSM unit along the left side of the chassis to the rear left flexible hose connection.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-021",
      "node": "rearBrakeLineRight",
      "label": "Rear Brake Hard Line — Right",
      "assembly": "Hydraulics",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "brake-lines",
      "function": "Steel hard line that routes pressurised brake fluid from the ABS/PSM unit along the right side of the chassis to the rear right flexible hose connection.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-022",
      "node": "epbSpringLeft",
      "label": "Parking Brake Return Spring — Left",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "epb-actuator-left",
      "function": "Return tension spring inside the left drum-in-hat mechanism that pulls the parking shoes off the drum when the hand lever is released.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-023",
      "node": "epbSpringRight",
      "label": "Parking Brake Return Spring — Right",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "epb-actuator-right",
      "function": "Return tension spring inside the right drum-in-hat mechanism that pulls the parking shoes off the drum when the hand lever is released.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-024",
      "node": "epbShoeLeft",
      "label": "Parking Brake Shoe — Left",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "epb-actuator-left",
      "function": "Friction-lined brake shoe inside the drum-in-hat section of the rear rotor, spread against the drum by the cable-operated expander to hold the car; adjusted via the star wheel through the rotor face.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-025",
      "node": "epbShoeRight",
      "label": "Parking Brake Shoe — Right",
      "assembly": "Parking Brake",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "parent": "epb-actuator-right",
      "function": "Friction-lined brake shoe inside the drum-in-hat section of the rear rotor, spread against the drum by the cable-operated expander to hold the car; adjusted via the star wheel through the rotor face.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-026",
      "node": "rearHubBearingLeft",
      "label": "Rear Wheel Hub Bearing — Left",
      "assembly": "Hub & Bearing",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Angular contact ball bearing pressed into the rear wheel carrier that supports the rear hub and drive flange; commonly inspected or replaced during rear brake servicing.",
      "componentId": "rbrakes"
    },
    {
      "id": "rear-brakes-new-027",
      "node": "rearHubBearingRight",
      "label": "Rear Wheel Hub Bearing — Right",
      "assembly": "Hub & Bearing",
      "system": "Brakes",
      "tier": "sub",
      "partNumber": null,
      "function": "Angular contact ball bearing pressed into the rear wheel carrier that supports the rear hub and drive flange; commonly inspected or replaced during rear brake servicing.",
      "componentId": "rbrakes"
    }
  ]
}