SY4030-SY4035

SY4030/SY4035 — front 4-piston caliper with a monobloc body and an integrated mounting bracket for mini cars. OVERVIEW SY4030/SY4035 are in-house calipers with a one-piece (monobloc) body: the mounting bracket (bridge) is forged together with the body. This eliminates installation errors, simplifies fitting and increases rigidity. The body is forged from aluminium alloy: forging delivers high rigidity, tensile strength, toughness and material density. Compared with cast aluminium calipers, body rigidity is about 50% higher, which reduces the risk of caliper failure in service. The built-in double oil seal (instead of ordinary external dust boots) makes the brake feel and reaction more precise. After anodizing and vacuum coating (CVD) the colour is locked in: the coating does not crack or peel and gives the caliper a metallic sheen and vivid colour. The two versions differ in fitment size: SY4030 — W211 mm, SY4035 — W230 mm. HIGHLIGHTS • Monobloc body with an integrated bracket forged in one piece — simpler installation, no fitment errors, higher rigidity. • Larger piston area — a more linear pedal feel. • After multi-stage testing, performance is about 45% above the stock caliper. • With high-performance pads it confidently handles intense driving — from mountain roads to the race track. CALIPER SPECIFICATIONS • Weight: SY4030 — 3200 g/pc; SY4035 — 3200 g/pc • Piston area: 45.49 cm² • Piston diameter: 34 mm × 2 / 38 mm × 2 • Brake disc diameter: Ø190 mm–Ø260 mm • Brake disc thickness: max 10 mm • Caliper dimensions: SY4030 — W211 × D111.4 × H60.5 mm; SY4035 — W230 × D111.4 × H60.5 mm • Distance from mounting plane to the top of the disc: 45.71 mm BRAKE DISC • Friction surface width: 54.5 mm • Ventilation: Ø380 × 34/26 — 84 curved ducts, 7 slots, PCD 258 mm; Ø355 × 32/26 — 72 curved ducts, 7 slots, PCD 233 mm; Ø332 × 32/26 — 72 curved ducts, 6 slots, PCD 210 mm • Heat treatment: 580 °C heating / 120 °C cooling, cycled for 72 h • Mounting hole diameter: Ø8.1 mm • Centring ring: Ø209 mm (for 355×32 disc); Ø190 mm (for 332×32 disc), petal step 2.5 mm • Surface treatment: iron phosphating, ground friction surface • Disc standard: GG20HC BRAKE PADS • Model: S66B • Thickness: 14 mm • Friction surface width: 50 mm • Friction block area: 67.31 cm² • Compound: F500 (standard) / F600 (street, optional) / S750 (street & track, optional) / R900 (track, optional) / S800 (for carbon-ceramic discs, optional) QUALITY CONTROL • Forged body tensile strength: Qb ≥ 320 MPa • Body hardness: HV ≥ 400 • Low-pressure seal test: 0.4 MPa air, hold 5 s, pressure drop ≤ 100 Pa • High-pressure seal test: 12 MPa air, hold 5 s, pressure drop ≤ 0.2 MPa • Appearance: anodized surface free of damage, uniform colour and gloss • Ultra-high pressure test: sampled calipers withstand 30 MPa oil pressure without failure • Other characteristics per QC/T592.