Year, Make, Model

2007 Honda CRF250R. 2004-2009 models should be the same. This should also cover CRF450R’s & “X” models as well.

Service Manual

Here are links to the service manuals that may come in handy during this project.

Honda CRF250R 2005 Owner’s Manual & Competition Handbook

Honda CRF250R 2007 Owner’s Manual & Competition Handbook

Honda CRF250R Service Repair Manual 2004 2005 2006 2007 2008 2009 61KRN05

[email-download download_id=”1436″ contact_form_id=”1248″]

Diagnosis

When the front brake lever is applied, it gradually loses pressure. If constant force is applied, the pressure will continue to bleed, and lever will eventually hit the handlebar. It turns out the piston seal started to bypass brake fluid and was the cause of the pressure loss.

Note: Don’t confuse this symptom with a spongy brake lever. A spongy lever may become firm at some point in its travel once air in system compresses a bit. If you have a spongy lever, simply reference the video below for brake bleeding procedure to get rid of trapped air.

The Fix: Replace The Seals

I put together a how-to video for this front master cylinder rebuild. You’ll notice two methods of brake bleeding: vacuum & manual. I prefer to use the Harbor Freight Brake Bleeder and Vacuum Pump Kit (item # 69328) on a dry system, which speed things along. At the end of the video I use the “manual” method to verify no air bubbles. You certainly can skip the vacuum bleeding and go straight to manual, it’ll just take longer.

I typically use Napa HD DOT 4 for motorcycle brake fluid.

 Comments

Was this video helpful? Please comment below!