R680R

R680R — rear compact 6-piston forged-aluminium caliper from TAVRUS with an integrated parking brake. OVERVIEW R680R is a compact 6-piston rear caliper developed for B-, C- and D-class 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; this 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 (an electronic parking-brake version is also available), so the rear axle needs no separate mechanism. Fitting improves the look of the wheel and lets the car handle everything from daily driving to the track. HIGHLIGHTS • One-piece forged rear 6-piston caliper of in-house design with an integrated parking brake. • Lightweight design combined with an improved linear pedal feel. • After rigorous multi-stage testing, performance is about 45% above the factory caliper. • With high-performance pads it confidently handles intense driving — from mountain roads to the race track. CALIPER SPECIFICATIONS • Weight: 2670 g/pc • Piston area: 24.58 cm² • Piston diameter: 21.86 mm × 2 / 21.86 mm × 2 / 24.86 mm × 2 • Brake disc diameter: Ø355 mm – Ø380 mm • Brake disc thickness: max 34 mm / min 32 mm • Caliper dimensions: D177 × H72.75 × W305 mm • Oil inlet thread: M10×1 • Mounting hole centre distance: 210 mm • Mounting hole offset: 42 mm • Mounting hole diameter: 12 mm • Distance from mounting plane to the top of the disc: 60.75 mm BRAKE DISC • Friction surface width: Ø355 mm × 32–52 mm; Ø380 mm × 34–52 mm • Ventilation: Ø355 × 32 — 72 curved ducts, 7 slots, PCD 233 mm; Ø380 × 34 — 84 curved ducts, 7 slots, PCD 258 mm • Heat treatment: 580 °C heating / 120 °C cooling, cycled for 72 h • Mounting hole diameter: Ø9.1 mm • Centring ring: Ø209 mm (for 355×32 disc), Ø238 mm (380×34), petal step 2.5 mm and 1.5 mm • Surface treatment: iron phosphating, ground friction surface • Disc standard: GG20HC BRAKE PADS • Model: R680A • Thickness: 25 mm • Friction surface width: 54 mm • Friction block area: 70.22 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.