This Complete Dirt Bike Rear Master Cylinder Reservoir Upgrade can be built for either a firmer brake pedal or a more progressive feel. To upgrade the Billet Brembo CNC Rear Brake Cylinder in the last photo, click the upgrade option.
Select the green option above if a more progressive is desired.
What’s included with this Dirt Bike Rear Brake Cylinder?
Nissin or Brembo – Brake master that’s fully assembled.
Titanium mounting & cover bolts.
Built-in Spring and CNC Clevis.
Built-in reservoir cap replaces older designs with remote plastic reservoirs.
Installed Piston & seals.
Genuine rubber dust cover and spring.
Everything’s included and assembled as reference pictures.
2025 CRF450RL has 3/8 rear brake master cylinder which is the small piston. I want to order the progressive master cylinder from you guys which also has the small piston. What is the difference between the OEM master VS your progressive master? I need precision rear braking for wheelies, the OEM has a numb feeling. TIA.Adrian asked on March 10, 2025
9mm 3/8 is the smallest for that model just have 11 and 13mm for better strength.
Boston Morse answered on March 13, 2025store manager
I race flattrack and we rely on rear brake feel to controls wheel spin. Recently switched to a 2025 Yamaha 450 and it’s way too grabby. What recommendations yall have thanksJustin jones asked on January 17, 2025
yes we have a 15% smaller piston available
Boston Morse answered on January 17, 2025store manager
I have a 23 TE 300 with braktek brakes. I would like to upgrade the rear so would I just need a new master cylinder a lever and caliper too?Ryan asked on June 11, 2024
Yes, this and the caliper will do the trick. The lever is optional.
what are the piston sizes for the yz 450 rear master cylinder. upgraded for more stopping not the more progressive model . Thanksjohn lundgren asked on August 18, 2023
2025 CRF450RL has 3/8 rear brake master cylinder which is the small piston. I want to order the progressive master cylinder from you guys which also has the small piston. What is the difference between the OEM master VS your progressive master? I need precision rear braking for wheelies, the OEM has a numb feeling. TIA.Adrian asked on March 10, 2025
9mm 3/8 is the smallest for that model just have 11 and 13mm for better strength.
Boston Morse answered on March 13, 2025store manager
I race flattrack and we rely on rear brake feel to controls wheel spin. Recently switched to a 2025 Yamaha 450 and it’s way too grabby. What recommendations yall have thanksJustin jones asked on January 17, 2025
yes we have a 15% smaller piston available
Boston Morse answered on January 17, 2025store manager
I have a 23 TE 300 with braktek brakes. I would like to upgrade the rear so would I just need a new master cylinder a lever and caliper too?Ryan asked on June 11, 2024
Yes, this and the caliper will do the trick. The lever is optional.
what are the piston sizes for the yz 450 rear master cylinder. upgraded for more stopping not the more progressive model . Thanksjohn lundgren asked on August 18, 2023
Need help with installation? Get a hold of a live agent.
FAQ
Is Shipping Included?
Yes, there is free shipping on all Dirt Bike Rear Brake Cylinder Upgrade: Master Cylinder Reservoir‘s in the continental US.
Is fitment guaranteed?
Yes, when all options are selected for the Dirt Bike Rear Brake Cylinder Upgrade: Master Cylinder Reservoir, fitment is guaranteed.
Do you ship worldwide?
Yes, we ship all products internationally for an additional cost. Additional shipping costs for a product will show when your region is selected on the checkout page under shipping.
What is your product return policy?
With any Dirt Bike Rear Brake Cylinder Upgrade: Master Cylinder Reservoir for sale online, PayPal, Apple Pay, Google Pay and credit card are covered by a 30-day return/replace policy if the product is defective or if you don’t receive what you ordered. But since most products we offer are customized to your order, we cannot accept returns and provide refunds for non-warranty reasons (but our products are easy to sell on eBay or Craigslist!). Read more here.
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Use the Q&A feature on any product page (see the Q&A tab on this page, for example) where you can get product-specific answers to your questions, OR get one-on-one pro help by phone or video using our Pro Direct Connect service.
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Kirk –
looks and works better than the stock kx500 master