Wilwood

Master Cylinder Kit

$779.95

SKU: KIT40122

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Wilwood Hydroboost Brake Kit, identified by product code KIT40122, is engineered to deliver superior braking power and a refined appearance. This kit includes a polished Wilwood master cylinder, a key component that facilitates precise control over brake fluid pressure, leading to more responsive and reliable stopping. Wilwood brake kits are known for their big brake stopping power, complementing wheel, tire, and suspension upgrades. The provided assembly instructions note that this brake kit does not include flex lines, and OEM brake lines will not adapt to Wilwood calipers due to the caliper inlet fitting being a 1/8-27 NPT. The preferred method is to use steel braided lines. While many Wilwood kits require no modifications for installation and provide clearance inside popular wheels, it is always recommended to check specific wheel clearance diagrams to ensure fitment with your particular wheels.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandWilwood
Part NumberKIT40122
CategoryBrakes

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

View Full Shipping Policy