- Prime fits with all trigger shiftersPatent Pending Top-Hat Reach Adjust Dial
- Tool free on the fly lever position adjustment with the flick of a finger
- Adjusts lever home position without affecting mechanical advantage
- Keeps the feel of the brake consistent throughout the entire stroke, regardless of the lever position. Riders with small hands get the same power and linear feel, as riders with big hands.Detented Reach Adjust
- Ensures that your lever stays put once it is setOversized Titacon Pivot Bushings
- Provide a great bearing surface and have a tight fit for excellent durabilityDust Boot
- Protects the internals from the elementsMaster Cylinder Piston
- The piston is hollow so fluid can pass throughBrake Fluid Reservoir
- Large reservoir manages fluid expansion generated by heat and compensates for pad wearAsymmetrical Two-Piece Clamp
- Tighten the front bolt down and set the torque with the back bolt Poppet
- Poppet valve controls brake fluid flow.Poppet Cam
- Rotates 180 degrees and is adjusted externally by the rider. This Cam acts on the Poppet to set more or less stroke in the Prime system.Brake Fluid Flow Path
- The Poppet valve has three channels that increase flow 5 times that of traditional systemsNew Lever Blade Shape and Hook
- Holds the rider’s finger in place without any annoying and painful “hot spots”Poppet Cam Dial
- Tool free on the fly stroke adjust with the flick of a thumbTitanium Pushrod
- Saves grams and creates near zero piston side loading. Resulting in an efficient and durable brake. Hollow Clamp for Weight Savings
Contact adjustment, also known as dead stroke or dead band adjustment, changes the point in the lever stroke where the brake pads come in contact with the rotor. Poppet cam technology accomplishes this without affecting the lever’s home position. Some riders prefer a very short stroke, or throw, when they squeeze the brake lever blade. Others like a lot of lever travel. The poppet cam adjustment covers both, and everything in between. Additionally, you can use our Top-Hat tool free reach adjustment to dial the lever blade position closer to the grip or further away. This feature combined with the poppet cam stroke adjustment allows the rider to tune the Prime brake exactly how they like it. This tuning can be done in the shop or at the trailhead before the ride, but the Prime takes it a step further. The tool-free dials and short adjustment ranges enable the rider to make stroke and reach tweaks on the fly, with the flick of the thumb. No other brake can do this for you. Top-Hat sets start point. Poppet cam sets end point (tire lock point). The two can be adjusted individually without affecting each other.
The poppet cam design has a flow path five times larger than that of the Stroker’s three port-timing holes. This increased flow will eliminate lever pump caused by heat buildup. Additionally, the reservoir allows the brake to compensate for brake pad wear. As the pads shed material, the pistons will slip and allow the pads to stay close to the rotor rub area. When these pistons slip, additional brake fluid is needed behind them. This equalization can only occur with a properly sized reservoir and an efficient flow path.
The bore of the Prime master cylinder does not have port-timing holes drilled into it. In a traditional system, a port or ports must be drilled through the bore in order for the brake fluid to be able to vent into and from the reservoir. This traditional design has been in production for decades and is a relatively simple and cost-effective design. However, the rubber primary cup or seal of the master cylinder piston must cross over these holes every time the brake lever is squeezed, and then back across when it is released. This wears on the rubber cup over time. Additionally, any burrs or imperfections in the port-timing holes will accelerate this wear.