S46R

S46R — rear compact 4-piston caliper with an integrated drum-type parking brake. OVERVIEW S46R is a compact 4-piston rear caliper developed for mid-size, mid-large and large vehicles. 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. A drum-type parking brake is integrated into the body, so the rear axle needs no separate parking brake mechanism. HIGHLIGHTS • Compact 4-piston rear caliper for mid-size and large cars. • Integrated drum-type parking brake — a compact rear-axle layout with no separate mechanism. • Four pistons match the vehicle better and improve braking performance. • After multi-stage testing, performance is about 25% above the stock caliper. • With high-performance pads it confidently handles intense driving, including mountain roads. CALIPER SPECIFICATIONS • Weight: 2543 g/pc • Piston area: 27.99 cm² • Piston diameter: 32 mm × 2 / 28 mm × 2 • Brake disc diameter: Ø300 mm–Ø332 mm • Brake disc thickness: max 32 mm / min 30 mm • Caliper dimensions: D145 × H73.037 × W271.814 mm • Oil inlet thread: M10×1 • Mounting hole centre distance: 150 mm • Mounting hole offset: 43 mm • Mounting hole diameter: 12.25 mm • Distance from mounting plane to the top of the disc: 36.86 mm BRAKE DISC • Friction surface width: Ø300 mm × 30–54.5 mm; Ø332 mm × 32–54.5 mm • Ventilation: Ø300 × 30 — 64 curved ducts, 6 slots, PCD 183 mm; Ø332 × 32 — 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: Ø158 mm (for 300×30 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: S46A • Thickness: 15 mm • Friction surface width: 50 mm • Friction block area: 58.9 cm² × 2 pads per caliper • 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.