Shimano BL-M785 bleed screw and O-ring - 8VC - 9801
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Product Information
Full details
This guide is for bicycle mechanics and enthusiasts seeking to maintain their Shimano BL-M785 hydraulic disc brakes. The key benefit is ensuring reliable braking performance through genuine replacement parts. A potential caveat is that this kit is specific to the BL-M785 model and may not be compatible with other brake levers. This product is a bleed screw and O-ring kit designed to facilitate the brake bleeding process, ensuring proper fluid exchange and system sealing for optimal brake function.
All features
| Series | 8VC |
|---|---|
| Model Part Number | 9801 |
| Brand | SHIMANO |
Extended Product Information
FAQs
What is the primary function of this bleed screw and O-ring kit?
This kit provides the necessary components to properly seal the bleed port on your Shimano BL-M785 brake lever during the brake bleeding process, ensuring effective fluid exchange and air removal.
Is this kit compatible with all Shimano brakes?
No, this specific kit is designed for the Shimano BL-M785 model only. Compatibility with other models is not guaranteed.
How often should I bleed my brakes?
Brake bleeding frequency depends on usage and conditions, but it is generally recommended annually or when you notice a spongy lever feel or reduced braking performance.
Can I reuse the old O-ring?
It is strongly recommended to use the new O-ring provided in the kit. Reusing an old or worn O-ring can lead to leaks and an ineffective bleed.
What type of brake fluid does Shimano use?
Shimano hydraulic disc brakes exclusively use Shimano mineral oil. Do not use other types of hydraulic fluid, such as DOT fluid, as it can damage the brake system.
Where can I find the specific bleeding procedure for my BL-M785 brakes?
Refer to the official Shimano service manual for your BL-M785 brake levers, or consult a qualified bicycle mechanic for detailed instructions.
Troubleshooting
Bleed screw leaks fluid during bleeding
Ensure the O-ring is properly seated on the bleed screw and that the bleed screw is tightened sufficiently. Check the O-ring for damage and replace if necessary.
Air remains in the system after bleeding
Verify that the bleed screw and O-ring created a proper seal. Ensure the bleed funnel is correctly attached and filled. Try repeating the bleeding process, paying close attention to the bleed screw sealing.
O-ring is damaged or missing
Replace the O-ring with the new one from the kit. If the O-ring is lost, it must be replaced before attempting to bleed the brakes to prevent leaks.
Pros and Cons
Pros
- Ensures proper brake function and safety.
- Direct replacement for original equipment.
- High-quality materials for durability.
- Facilitates a clean and effective bleed process.
Cons
- Specific to BL-M785 models; not universally compatible.
- Requires basic mechanical knowledge for installation.
- Small parts can be easily lost if not handled carefully.
Setup, Compatibility & Care
Compatibility: This bleed screw and O-ring kit is designed specifically for the Shimano BL-M785 brake lever model. Ensure your brake lever model matches before proceeding.
Setup (Bleeding Process):
- Gather necessary tools: bleed kit, Shimano mineral oil, bleed funnel, syringes, and an Allen wrench.
- Attach the bleed funnel to the reservoir cap port.
- Insert the bleed screw into the caliper or lever bleed port, ensuring the O-ring is correctly seated.
- Loosely screw in the bleed screw at the caliper (if bleeding from the caliper). Follow the specific bleeding procedure for your Shimano brake system, typically involving dispensing oil from the funnel and opening/closing the bleed screw.
- Once bleeding is complete, tighten the bleed screw securely but do not overtighten.
Care: Store the bleed screw and O-ring in a clean, dry place. Inspect the O-ring for any signs of wear or damage before each use. Clean any residual brake fluid from the components after use.