Gear / Parts Brembo GP4 MotoGP Caliper First Look: Debut at Jerez

Brembo GP4 MotoGP Caliper First Look: Debut at Jerez

Brembo has a new caliper for the 2020 MotoGP World Championship series, as it will be supplying braking components to all 22 MotoGP riders on the grid. The Brembo GP4 is a radially mounted monobloc aluminum caliper with a four-piston design.

Brembo GP4 MotoGP Caliper - Valentino Rossi

The Brembo GP4 was tested at Valencia last year and Sepang this year, with the debut coming at the revised 2020 MotoGP opening round at Circuito de Jerez – Ángel Nieto. The significant change is fins on the caliper body to keep the brake fluid cool. One reason for this is that the quantity of fluid in the system is smaller to give a more direct feel with a higher level of consistency.

Brembo GP4 MotoGP Caliper - Marc Marquez

To match the new GP4 caliper, Brembo gives riders a choice of eight carbon fiber discs. There are four disc diameters, ranging from 320 to 340mm. Among those four choices, each disc is available in Low Mass and High Mass carbon compositions. Beyond that, there are two different carbon compounds for the brake pads. All of these choices allow the discriminating rider to customize the brake response to his preference and needs.

Brembo GP4 MotoGP Caliper - 2020 Season

A Brembo spokesman outlined the advantages of carbon fiber for brake discs, saying, “Carbon ensures a triple advantage—a reduction of unsprung mass, an identical friction coefficient from the start to the finish line, and an absence of residual torque issues that can come from the use of steel discs.”

Many fans may not know that one-third of the MotoGP grid uses a thumb rear brake—a technology that dates back to Mick Doohan in the 1990s. The MotoGP racers have a choice of two thumb master cylinder braking systems. The standard system uses the thumb and pedal together to actuate the two-piston caliper. In the other, there are two separate circuits, each working on its own pair of pistons in the caliper. Further, there is an option that allows the rider to use either his thumb or index finger to actuate the rear brake.

Although Brembo doesn’t have quite the braking dominance in Moto2 and Moto3, it has a strong presence. Ninety percent of Moto2 and Moto3 teams use Brembo calipers and master cylinders, with 75 percent using Brembo pads, and about half using Brembo’s steel discs.

Don Williams
Don Williams
With 50 years of riding experience, Don Williams is a fan of all kinds of motorcycles. He enjoys sport bikes, cruisers, dirt bikes, touring bikes, adventure bikes, dual sport bikes, and rideable customs. Ask Don what his favorite bike is and he will tell you, "Whatever bike I'm on."

2021 BMW S 1000 XR First Look (5 Fast Facts From Europe)

We just got through testing the BMW S 1000 XR, and now we’re looking at the 2021. Our European sources tell us that there...

Yamaha YDX-Moro and YDX-Moro Pro First Looks (13 Fast Facts)

Yamaha continues to expand its pedal-assist electric bicycle range with the new YDX-Moro and YDX-Moro Pro. Both are designed as off-road capable two-wheelers that...

MV Agusta and Akrapovič Partner: New Exhaust Systems Coming

Italy’s legendary MV Agusta and Slovenia’s celebrated Akrapovič are partnering to create new exhaust systems for MV Agusta motorcycles. Both MV Agusta and Akrapovič...

2021 BMW K 1600 Grand America First Look (8 Fast Facts)

The low-slung fully dressed 2021 BMW K 1600 Grand America stately tourer has just a few updates this year—most of them taking previously optional...

Sena Outrush Helmet Review: Smart Modular Motorcycle Helmet

I am a modular helmet rider, and I enjoy being technology-connected. I like my helpful toys, and I enjoy my interaction with them. When...

2021 BMW R 1250 RS First Look (8 Fast Facts From Europe)

Our European sources have given us a first look at the 2021 BMW R 1250 RS sport-touring motorcycle. Most of the changes are in...