S47AAR-PLUS

Integrated-electronic-parking-brake compact 4-piston rear caliper TAVRUS for mid-size, medium-large and large cars. OVERVIEW S47AAR / S47AAR-PLUS is a compact 4-piston rear caliper from TAVRUS with an integrated electronic parking brake. 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. HIGHLIGHTS • Compact 4-piston rear caliper with an integrated electronic parking brake for mid-size, medium-large and large cars. • Four pistons match the vehicle's characteristics and improve braking performance. • The integrated electronic parking brake simplifies the rear-axle layout — no separate parking-brake mechanism is needed. • After multi-stage testing, performance is about 30% above the stock caliper. • With high-performance pads it handles intense driving with confidence — from mountain roads to the track. CALIPER SPECIFICATIONS • Weight: 3251 g/pc • Piston area: 44.84 cm² • Piston diameter: 32 mm × 2 / 28 mm × 2 • Brake disc diameter: Ø355–Ø380 mm • Brake disc thickness: max 34 mm / min 30 mm • Caliper dimensions: D160.2 × H76.048 × W285 mm • Oil inlet thread: M10×1 • Mounting hole centre distance: 180 mm • Mounting hole offset: 40 mm • Mounting hole diameter: 12.25 mm • Distance from mounting plane to the top of the disc: 38.61 mm BRAKE DISC • Friction surface width: 54.5 mm • Ventilation: Ø355 × 30 mm — 72 curved ducts, 7 slots, PCD 233 mm; Ø380 × 34 mm — 84 curved ducts, 8 slots, PCD 258 mm • Heat treatment: 580 °C heating / 120 °C cooling, cycled for 72 h • Mounting hole diameter: Ø8.1 mm • Centring ring: Ø355 × 32 — Ø209 mm, petal step 2.5 mm; Ø380 × 34 — Ø238 mm, petal step 1.5 mm • Surface treatment: iron phosphating, ground friction surface • Disc standard: GG20HC BRAKE PADS • Model: S66A • Thickness: 18 mm • Friction surface width: 50 mm • Friction block area: 67.3 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.