Chase Bays Single Piston Brake Booster Delete for Mazda MX-5 NA NB

£302.36 inc. VAT

Available to order — usually ships in 5 days

Dial in your brakes with a bias valve

Chase Bays Adjustable Brake Bias Valve Kit for Mazda MX-5 NA NB

The Chase Bays Single Piston Brake Booster Delete for Mazda MX-5 NA NB offers unparalleled pedal feel and performance. With consistent braking from 10-80%, it’s akin to good brakes on a booster setup. At pressures from 81-100%, braking demands slightly more leg effort but excels here, allowing precise control. Unlike boosters, it delivers the same braking every time, with easy modulation for desired braking levels, ensuring consistent stopping power.

A properly sized master cylinder, an adjustable bias valve, and performance brake pads achieve optimal pedal feel and controlled braking. Tailored to the Mazda MX-5, the Single Piston Brake Booster Delete kit ensures the perfect master cylinder size for balanced performance. Plus, extensive on-track testing ensures unparalleled reliability and performance.

Please note this kit requires aftermarket brake lines due to its single-outlet design.


  • Optimised master cylinder sizing for the correct pedal feel and travel
  • Compatible with big brake kits
  • Improve pedal feel and control
  • Enhanced brake modulation
  • -3AN fittings

Additional information

Shipping Weight 0.99 kg
Shipping Dimensions 30 × 16 × 16 cm
HS Code


Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.