Deore XT BL-M8100 Disc Brake Lever
Deore XT BL-M8100 Disc Brake Lever

Deore XT BL-M8100 Disc Brake Lever


Regular price$56.99
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

With a focus on reduced weight and advanced stopping power, the Shimano Deore XT BL-M8100 lever provides intuitive modulation so that you can explore your limits with confidence. The BL-M8100 XT brake lever is compatible with both 2-piston and 4-piston Deore XT brake sets (M8100, M8110, M8120).


  • Model No: BL-M8100
  • Series: Deore XT M8100
  • Mount: Clamp band
  • I-SPEC EV compatible


  • Brake caliper: BR-M8100 2-piston, BR-M8110 2-piston (flat mount), BR-M8120 4-piston
  • Lever blade: BL-M8100 Lever Member Unit
  • Brake hose: SM-BH90-SBM
  • Oil: Shimano Hydraulic Mineral Oil

Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right part the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!


We currently offer both economy and expedited shipping options though FedEX and USPS. 

Orders totaling over $49 are eligible to ship for free via an economy ground option of our choice. 

If you're in need of something super-quick, please contact us directly. We may be able to overnight your order with an additional fee and depending on your location. 


Should there be an issue with the item you bought, or you no longer need your purchase, we will be happy to set up a return.

Returns or exchange requests for New or Used Bikes must be requested by emailing us at within fifteen (15) days from the date of delivery. Bikes must be in un-ridden condition. Custom-built bikes may not be returned. Returned bikes have a $200 restocking fee and the customer pays for return shipping.

Returns for most other items may be requested within sixty (60) days of the delivery date. All returned items must be received in new, unused, and uninstalled condition, with the original tags and labels attached and in the original packaging. We cannot accept returns on any items installed or show wear of any kind. 

Clearance and open-box items may not be returned. 


To request a return, please log in to your customer account by clicking the  customer account icon  Profile icon in the top right of any page or visit

1. In the Email field, enter your email address and click Continue.

2. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.

3. Go back to the online store and enter a six-digit verification code to log in.

4. Find and click on the order that you want to submit a return for.

5. If your order has more than one item, select only the items you want to return.

6. Select a return reason and add a note for the store if needed.

7. Click Request Return.

Once your return request is approved, you will receive an email with shipping instructions and a return shipping label. 


We will process your return after we receive your returned item(s) and inspect the condition. Please allow at least seven (7) days from the receipt of your item to process your refund. We will notify you by email when your return has been processed.


If you receive defective or damaged products or if we sent you the wrong products, please contact us using the phone number or email below.


If you have any questions concerning our return policy, please contact us at:

(928) 282-1106   |

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Customer Reviews

Based on 12 reviews
J Kelly

After a wicked yard sale crash which broke my rear brake lever and resevoir i ordered the blm8100 and has been great. Got to the east coast quickly from thunder mtn

Daniel Kim
Sleek design without using corrosive DOT fluid.

We’ve always been a fan of Shimano’s XT brake levers. When my wife decided to switch her road bike drop bars to flat bar she wanted to get the Shimano XT brake levers as opposed to SRAM’s mountain bike levers. She likes that it looks a little sleeker than WHAT SRAM had to offer and having experience with the older XT levers from 7 years ago she decided to stick with the XT levers. The confident braking these levers gives her was a no brainer. Use of mineral oil and not the corrosive DOT fluid is nice. Bleeding these levers are so easy. The Shimano XT levers also work perfectly with the Ultegra 8170 calipers. Very nice combo.

Nicholas Chin Leung Fatt
XT Lever

Bought as a replacement. Fast shipping!

Aiden Schubert

Fantastic! The exact part I needed and it was to me very quickly. Will definitely be doing business with them again!

Igor Agrest
Very good levers

Good levers, noticeably less flex due to the re-design like the progressive feel, light, small, great adjustments. Magura Trail levers were my favorites before I installed these on my Air9 hardtail, with the Magura 4 pot calipers.