How To Service The Rear Brake Master Cylinder On Your 2009 – 2010 Honda CRF450r.
The Tools You Will Need Are:
- 12mm Socket
- 7mm Socket
- 12mm Wrench
- 10mm Wrench
- 8mm Wrench
- 8mm Hex
- 5mm Hex
- Small Pick
- Stiff Brush
- Long Nose Snap Ring Pliers
- Torque Wrench
- Shop Towels
The Parts You Will Need Are:
- Rear Master Cylinder Rebuild Kit
- Dot 4 Brake Fluid
- Rubber Grease
If you don’t have your rebuild kit yet, you can get the one I am using HERE (link to RockymountainATVMC.com).
This rear master cylinder rebuild should cost around $25 and take around 30 minutes to complete.
Brake fluid will damage almost everything it touches, so make sure you have your shop towels handy!
Clean every part inside and out with brake cleaner and a shop towel.
Inspect every component for damage or uneven wear.
If you find any rough spots, gently sand them down with fine grit emery paper.
Measure the inside diameter of the cylinder bore, and the outside diameter of the piston.
The cylinder bore should be no Greater than 9.575mm and the piston should be no LESS than 9.465mm.
If your cylinder bore and piston are out of spec, they need to be replaced.
Before assembly, take stock of your new parts.
I am installing an All Balls Rear Master Cylinder Rebuild Kit that includes a new pushrod boot, banjo bolt seals washers, piston cups, spring clip and piston spring.
If you have any questions or anything to add, please leave them in the comments or on our FaceBook page!
Keep Your ’09-’10 CRF450r Running Right!
- Service Specification
- Clutch Replacement
- Fuel System Service
- Engine Top End
- Front Fork Maintenance
- Rear Shock Rebuild
- Wheels & Tires
- Kickstarter Inspection
- External Shift Linkage