MyBike.parts
Are £50 AliExpress 4-piston brakes actually any good? I test the ZRACE XG4 callipers and see if they fix the problem with my LTWOO Groupset!
Want to try them yourself and get a discount!?
Tap the link https://s.click.aliexpress.com/e/_EIDVyVs or enter the search code [AYDE4A] on the AliExpress homepage
And Use My Discount Codes:
$3 off on orders over $29:【IFP9BCVF】
$6 off on orders over $59:【IFPG0GXB】
$9 off on orders over $89:【IFPQRUYT】
$16 off on orders over $149:【IFPOMXLP】
$23 off on orders over $199:【IFPTDTKH】
$30 off on orders over $269:【IFP2JK3V】
$40 off on orders over $369:【IFPIELSY】
$50 off on orders over $469:【IFP18HU3】
$60 off on orders over $599:【IFPI5DWC】
$70 off on orders over $699:【IFPPY6YX】
Follow me for more behind the scenes:
Instagram: https://www.instagram.com/tom_bowers_/
Strava: https://www.strava.com/athletes/1876048
Twitter/ X : https://x.com/fairlylongbike
Facebook: https://www.facebook.com/profile.php?id=100063006021739
Business enquiries:
✉️ tom@tbcycling.uk
📌 Chapters
0:00 – Intro (why I needed new brakes)
1:26 – Unboxing & first look
3:49 – Weigh-in
5:46 – Install & setup
7:36 – Are they any good?
Keywords: zrace xg4 review,zrace xg4 calipers,zrace brake review,aliexpress 4 piston brakes,cheap 4 piston brake calipers,budget hydraulic disc brakes,zrace vs shimano brakes,ltwoo gr9 brakes,gravel bike brake upgrade,affordable road bike brakes,chinese bike components,aliexpress cycling review,tb cycling,tom bowers cycling,budget cycling upgrades,best cheap disc brakes,zrace mtb brake review,powerful budget brakes,are zrace brakes any good,zrace any good?,zrace
Bike part mentions in this video
Disc-BrakesZRACE XG4 flat mount four-piston caliper, road hydraulic brake caliper, ice technology brake pads, CNC lightweight
Created: September 12, 2025The reviewer purchased a set of ZRACE XG4 brake calipers from AliExpress to replace incompatible L2 calipers on their gravel bike. They describe the calipers as having a very in-your-face green color (available in various colors), a four-piston design, a one-piece construction with no joining seam, and being noticeably lightweight. After installation and testing, the reviewer was very impressed with their performance, stating they feel incredibly powerful with direct lever actuation, confident lever feel without mushiness, and good modulation. The calipers completely fixed the mounting problems with the frame and were straightforward to set up and bleed.
AI-Summary
Pros
- Completely fixed the mounting problems with the Light Carbon frame
- Look incredible on the bike, adding a splash of color
- Straightforward setup and installation
- Easy to bleed
- Performed amazingly on the trails
- Feel incredibly powerful
- Have a really direct lever actuation
- Confident lever feel, not mushy
- Good modulation
- Lightweight
- One-piece design
- Available in a variety of colors
- Significantly cheaper than UK alternatives like Shimano 105
- Definite buy for standalone mineral oil calipers
Cons
- Do not come pre-bled; the system is completely empty and requires the user to add fluid and set everything up
- More sensitive to rotor alignment than some other calipers (e.g., Jura Ace), making them rub more easily if slightly misaligned
Key Points
- Four-piston design
- Flat mount
- Road hydraulic brake caliper
- Compatible with mineral oil (also available in DOT fluid versions)
- One-piece CNC design with no joining seam
- Lightweight (111g per caliper vs 131g for L2 caliper)
- Comes with empty hoses, mounting hardware, barbs, olives, and compression nuts
- Cost £52 for a pair
- ZRACE is described as a common brand on AliExpress, not a no-name part
