{"product_id":"rear-brake-master-cylinder-vespa-gts-250-300","title":"Rear Brake Master Cylinder - Vespa GTS 250\/300","description":"Vespa GTS 250\/300 Rear Master Cylinder Don't compromise on safety with a spongy or leaking brake lever. Over time, internal seals in your master cylinder can perish, leading to inconsistent braking pressure and dangerous fluid leaks. This high-quality aftermarket replacement restores that crisp, \"factory-fresh\" lever feel and ensures your Vespa GTS has the reliable clamping force needed for heavy city traffic and high-speed touring. Key Features OEM-Spec Performance: Manufactured to meet or exceed original Piaggio specifications for a direct, \"no-fuss\" swap. Precision Bored: Features a high-tolerance internal cylinder for smooth piston travel and consistent hydraulic pressure. Durable Housing: Cast from high-strength alloy to withstand high-pressure braking cycles and environmental corrosion. Pre-Assembled: Comes with the internal piston and seal kit pre-installed, saving you the headache of a complex rebuild. Fitment Guide Brand Model Specific Fitment Vespa GTS 250 \/ GTV 250 All Years (Rear Brake) Vespa GTS 300 \/ GTV 300 All Years (Rear Brake) Vespa GTS Super \/ HPE All Versions (Non-ABS \u0026amp; ABS) Piaggio MP3 250 \/ 400 \/ 500 Check Year for Rear Actuation Technical Specs Part Number: CM074901-AFT Material: Cast Aluminum Alloy Position: Left-Hand Side (Rear Brake) Compatibility: DOT 4 or DOT 5.1 Brake Fluid (Consult Manual) Maintenance Note: Brake fluid is hygroscopic (absorbs water). If your old master cylinder failed due to internal corrosion, ensure you perform a complete system flush with fresh DOT 4 fluid to prevent the new unit from fouling. Installation Tip: Always use new copper crush washers on the banjo bolt. Reusing old washers is the #1 cause of slow leaks at the master cylinder connection. Pro Tip: Vacuum bleeding is highly recommended for the GTS series. Because of the long brake line run from the handlebar to the rear caliper, getting all the air out manually can be a time-consuming process. You can also purchase this part through your local Genuine dealer. WARNING: California Proposition 65","brand":"rms","offers":[{"title":"Default Title","offer_id":48045583630523,"sku":"CM074901-AFT","price":90.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/thriftyscooters.com\/products\/rear-brake-master-cylinder-vespa-gts-250-300","provider":"Thrifty Scooters","version":"1.0","type":"link"}