RCR 80V Front Brake Reservoir Top-Off Guide

RCR 80V Front Brake Reservoir Top-Off Guide

This guide explains when and how to top off the front brake reservoir on your RCR 80V, and what braking feel is considered normal.

Braking Design Overview (Important Context)

The setup on the 80V was intentionally designed to offer more modulation rather than aggressive, raw braking power. During testing and development, we found that giving the front brake too much bite — like on the original 72V RCR — made it very easy to lock the wheel and, in some situations, send riders over the bars.

With the 80V, we aimed for a balance that feels controlled for first-time riders, while still giving experienced riders the stopping performance they expect through the combination of rear hydraulic brakes and increased regenerative braking.

When You Should Top Off the Brake Reservoir

Your front brake should still feel firm and responsive.

You may need to top off the reservoir if:

  • The front brake feels unusually weak

  • Lever travel feels excessive or inconsistent

  • Braking performance feels degraded compared to normal

What You’ll Need

  • DOT 3 or DOT 4 brake fluid
    (Available at any auto parts store)

  • Clean rag or paper towels

  • Small screwdriver (for reservoir cover screws)

Step-by-Step: Topping Off the Front Brake Reservoir


Step 1: Position the bike

  1. Park the bike on a level surface.

  2. Turn the handlebars so the brake reservoir is level.

Step 2: Open the reservoir

  1. Locate the front brake master cylinder reservoir on the handlebar.

  2. Carefully remove the reservoir cover screws.

  3. Remove the cap and rubber diaphragm.

Step 3: Check fluid level

  • The fluid should sit near the top of the reservoir

  • If low, proceed to topping off

Step 4: Add brake fluid

  1. Slowly add DOT 3 or DOT 4 brake fluid.

  2. Do not overfill.

  3. Avoid spilling fluid on painted surfaces.

Step 5: Reassemble

  1. Reinstall the rubber diaphragm.

  2. Reinstall the reservoir cap.

  3. Tighten screws evenly (do not overtighten).

Step 6: Test the brake

  1. Squeeze the front brake lever several times.

  2. Confirm the lever feels firm and consistent.

  3. Perform a slow test ride before riding at speed.

Final Notes

  • A modulated front brake feel is normal on the RCR 80V

  • The bike relies on a combined braking approach, not front brake bite alone

  • If the brake feels abnormally weak after topping off:
    No given answer for this question.


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