SC430 Wiki — Index

Pages: 31 | Last updated: 2026-04-16

Systems

Power Steering System — Hydraulic PS system, known hose failure patterns, diagnostic approach
Cooling System — 3UZ-FE cooling system, radiator failure mode (stub — needs expansion)
Front Suspension — Double-wishbone independent front suspension, control arms, caster geometry, common failure patterns
Braking System — Four-wheel disc, single-piston calipers. Two caliper suppliers (NBK vs Sumitomo) — pads are caliper-specific. Front 296mm vented, rear 307mm solid.

PS Reservoir Hose Brittle — Most common PS leak. Rubber hose hardens, clamp loses seal. Cheap fix (~$30-81).
PS High Pressure Hose Crack — Rubber section of HP line cracks with age. Expensive fix (~$893).
Radiator Plastic Tank Crack — Plastic top tank separates from aluminium core. Primary radiator failure mode.
Caster Arm Bushing Degradation — Most common front suspension failure. Rubber bushings soften/deform. Bump steer, wandering.
Upper Control Arm Ball Joint Wear — Integrated ball joint in UCA. Requires full arm replacement.
Factory Camber Tyre Wear — Factory camber (~-1.5°) causes inside-edge tyre wear. Fix with adjustable UCAs.
Two Caliper Suppliers — Critical for ordering brake pads. SC430 has NBK or Sumitomo calipers — pads are NOT interchangeable. Must inspect caliper before ordering.

44348-30200 PS Reservoir Hose — Reservoir to pump suction hose. ~ $81 OEM /$ 30 aftermarket.
44410-30410 PS Pressure Feed Tube — High pressure pump to rack assembly. ~$893 OEM.

48610-39085 Front Upper Control Arm Right — UCA with integrated ball joint. ~$479 OEM. Adjustable options available.
48630-39055 Front Upper Control Arm Left — UCA with integrated ball joint. ~$479 OEM. Mirror of right.
48068-30300 Front Lower Arm Right — Main lateral LCA #1. ~$248 OEM.
48069-30300 Front Lower Arm Left — Main lateral LCA #1. ~$248 OEM. Mirror of right.
48660-24020 Caster Arm Right — LCA #2 / caster arm. ~$185 OEM. Most common failure point.
48670-24020 Caster Arm Left — LCA #2 / caster arm. ~$185 OEM. Mirror of right.
43330-39535 Front Lower Ball Joint Right — Separate replaceable ball joint. ~$117 OEM.
43340-39415 Front Lower Ball Joint Left — Separate replaceable ball joint. ~$117 OEM. Mirror of right.

16400-50280 Radiator — Main engine radiator. Plastic/aluminium. Best aftermarket: Denso 221-3175 (~$115-150 USD).

P83045N Brembo Rear Brake Pad Sumitomo — Brembo Prime OE-equivalent ceramic. A$59.55 (sale).
P83037N Brembo Front Brake Pad Sumitomo — Brembo Prime OE-equivalent ceramic. A$82.05 (sale).
08.A038.11 Brembo Rear Rotor — UV coated, 307mm solid. A$206.60/pair (sale). Universal fit.
09.8402.11 Brembo Front Rotor — UV coated, 296mm vented. A$302.60/pair (sale). Universal fit.

IK20TT Denso Spark Plug — Iridium TT twin tip. 3UZ-FE confirmed. Need 8. A$16.75 each (sale).

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Heidelberg Automotive Repairs — Leif’s primary mechanic. Heidelberg Heights, Melbourne.
FIGS Engineering — US-based specialist for GS/SC430 suspension. Poly bushings, adjustable UCAs.
Automotive Superstore — automotivesuperstore.com.au. Brembo, Denso. 39-42% off RRP (April 2026 sale).

Front Suspension Refresh Guide — Decision framework for comprehensive front-end refresh. Diagnostic steps, parts matrix, OEM vs aftermarket costs, torque specs, DIY feasibility.