Recommended Additional Upgrades
The RCB E4+ (E4 Plus) is a significant step up in the “Plus” lineup, designed for riders who need more stopping power than the standard 14mm master pumps can offer. While it shares the premium CNC aesthetics of the E2+, its internal hardware is beefier.
Here is the breakdown of the E4+:
The Major Upgrade: 15mm Piston
The standout feature of the E4+ is the 15mm piston bore.
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Why it matters: Most stock master cylinders and the E2+ use a 14mm piston. The 15mm bore in the E4+ moves more fluid with every squeeze.
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The Result: It provides a much firmer brake feel and faster “bite” response. It is ideal if you have upgraded to multi-piston calipers (like 4-pot calipers) or if you simply prefer a very aggressive, sensitive braking response.
Comparison: E2+ vs. E4+
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Performance Verdict
The E4+ is essentially the “Performance” version of the series. Because of the 15mm piston, it is less “mushy” and more “instant.”
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Best for: Riders who find the stock 14mm pumps too soft or those who have upgraded their brake lines to braided steel and want a truly sharp response.
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Installation Note: Like the E2+, this is a universal “bolt-on” part, but because it moves more fluid, you might notice a shorter lever travel before the brakes engage.
Are you planning to pair this with a stock caliper, or are you looking to upgrade to a 4-pot caliper as well?
| Product Specifications | What’s in the Box? |
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Racing Mod is the Official Flagship Store for RCB Bangladesh and Uma Racing Bangladesh.
All our products are 100% authentic and come with an official authentication QR code for verification.
Common Questions & Answers (FAQs)
Is this master cylinder compatible with my motorcycle?
Yes, it offers universal fitment and works with most motorcycles, especially 150cc to 350cc bikes.
What is the advantage of a 15mm master cylinder?
A 15mm master cylinder provides stronger braking force and sharper response compared to smaller piston sizes.
Is this better than E2?
Yes, the E4+ offers more aggressive braking performance and improved feedback, making it a higher-tier upgrade.
Is this suitable for daily use?
Yes, it is suitable for both daily riding and performance riding.
Does it improve braking performance significantly?
Yes, it provides stronger stopping power and better control compared to stock master cylinders.
Do I need other upgrades?
For best results, pair it with an RCB brake hose and caliper.
How do I verify authenticity?
Scan the authentication QR code included with the product.
