Brembo GP4-RX caliper review


Active Member
I finally got some dry weather to get out and test these bad boys.

Installation was straight forward and I also installed the rear braided line while I was at it. The first run down my street at the end hitting the brakes I thought "What have I done... these feel terrible". They didn't bight well and had little feeling to them. Then I remembered new pads and a fresh bleed. After a few more corners it was feeling much better and by the time I got to work I was pretty happy with my purchase.

They have a good feel, plenty of stopping power and I feel at home with them already after a 15 minute commute to work. I'm sure after a decent run they will bed in well and feel even better.

When comparing to the R1 6pot calipers I was running before they are less on/off meaning they have more movement in the lever between engagement and full lock. I prefer this as when I went to the 6 pots I found myself wishing I had a bit more room to move on the lever when navigating the bike around tight twisties in the hills. By the look of the forecast for this winter, it may be a while before I get out onto those roads as we're getting a much wetter winter than last year. I don't like riding those roads in winter as the rain washes gravel across the roads and that combined with green (moss) on the roads makes for a cheek puckering ride which isn't really enjoyable.

Will give more feedback after I've had some more time with them under my braking fingers.



Truly a thing of beauty! Both your bike and the calipers. Ohlins front and rear is a dream set up. I will take suspension over horsepower any day! Awesome.


Active Member
Nice! Which master cylinder are you using?

The RCS19 has a ratio setting so you can dial in the lever feel and throw.


Active Member
I'm running the Brembo MC off an R1. I have dialed in the ASV lever with the tuning knob on there, but haven't had a look for other adjustments yet. Once the pads bed in and I've had some run time on them, I'll likely do another brake bleed (if necessary) and tune some more.


Active Member
Second day and they've bedded in well. I have a lot more feeling than the 6 pot calipers already and the stopping power is awesome. Very happy with these calipers. I might do a long ride home if this sun holds out.... It is pretty cold here today (well for us anyway) it was down to 8*C this morning.


New Member
Sounds great and I'm glad you like them. BTW how much are they?

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