Shimano Deore XT BR-M8020 Disc Brake Caliper - Thunder Mountain Bikes

Deore XT BR-M8020 Disc Brake Caliper


Regular price $129.99 Sale price$113.99
  • Low stock - 2 items left
  • Inventory on the way
  • Free shipping on all orders $49+

Shimano Deore XT BR-M8020 Disc Brake Caliper

The 4-piston Shimano Deore XT hydraulic disc brake caliper ups the stopping power by 10% over the M8000, 2-piston version making it perfect for aggressive trail riding.


  • Model No: BR-M8020
  • Series: Deore XT M8000
  • Pistons: 4
  • Mount: Post mount
  • Included brake pads: H03C
  • Fits front or rear brake


  • Brake lever: BL-M8000
  • Brake hose: SM-BH90-SBLS
  • Oil: Shimano Hydraulic Mineral Oil
  • Brake pad: D02S metal, D03S resin, H03A resin, H03C metal


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.

All returns must be requested within sixty (60) days of the fulfillment date (i.e. the date we printed the shipping label and boxed up your order.) All returned items must be received in new and unused condition, with the original tags and labels attached, and in the original packaging.  We cannot accept returns on any items that have been installed or show wear of any kind. 

Return Process

To request a return, please visit: and follow the steps to return eligible items from your order. 


After receiving your return and inspecting the condition of your item, we will process your return. Please allow at least seven (7) days from the receipt of your item to process your return or exchange. We will notify you by email when your return has been processed.

For all Special Order items, there is a 25% restocking fee. Special Order items are those that we do not currently stock.


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

Other questions?

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

(928) 282-1106   |

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Customer Reviews

Based on 2 reviews
Great upgrade

Needed to replace leaky caliper and went with the 4-pot version. Love the extra power with same feel as 2 piston on the rear. Usual fast service and great price at Thunder Mtn.

Brake calipers

I bought this to replace a BR M8120 which are impossible to find. This caliper uses a shorter banjo bolt than the newer version and must be sourced separately.