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
  • In stock, ready to ship
  • 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.

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 4 reviews
Raymond Scott

They work great, stops on a dime

In Stock, Fast Shipping, Great customer Service

This item was first of all in stock for a great price. The shipping was fast and throughout I was updated via customer service. Thanks for all you do!!.

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.