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The GP4-RS is Brembo's monoblock radial-mount caliper for serious track and sport riders. Its four 30 mm aluminum pistons, 108 mm radial spacing and finned body give strong, consistent braking with better heat dissipation than a plain caliper. It is about 10% lighter than the M4 monoblock and comes as a left/right pair with pads. It suits riders upgrading from cast two-piece calipers who want firmer lever feel and less fade, but it needs a matching radial master cylinder and correct disc offset to shine.
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Lowest price we've seen: $646.82 on Nov 10 at eBay. Tracked across 5 stores since Nov 10.
Riders who fit the GP4-RS praise the firm lever, strong bite and resistance to fade on track. Some note it is overkill for street use and sensitive to master cylinder and pad matching.
SPECIFICATIONS: Fixing Dimensions: 108mm Position: front Caliper Body: Monobloc Fixing: Radial Pistons: 4 Piston Diameter: 30mm Disc Height: 32-34mm Material: C.AL Surface Protection: Ti HA Bridges: 3 Hardware Material: ST Piston Material: AL Weight w/o Pads: 935g Pad Shap: C Pads Included: YES Offset: 22.5mm Brake Flu
