How to perform an operating check and airtightness check on a power brake booster on 2014 Mazda MX-5 Miata?

Depress the pedal with engine off to check reserve, then start the engine while pressing-slight drop is normal. For airtightness, cycle the engine and slowly depress the pedal repeatedly; decreasing travel shows airtightness. If it fails, check or replace the vacuum hose/check valve. Do not disassemble; replace the booster.

Genuine 2014 Mazda MX-5 Miata Brake Booster

Brake Power Booster

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2014 Mazda MX-5 Miata Brake Booster Part Number: NFY7-43-80ZA
$184.80 MSRP: $246.44
You Save: $61.64 (26%)
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Product Specifications
- Other Name: Vacuum Power Assist; Brake Booster
- Replaces: NFY7-43-80Z
- Item Weight: 8.60 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: NFY7-43-80ZA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 2014 Mazda MX-5 Miata Submodels:
- 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, Special Edition, Sport, SV, Touring | 4 Cyl 2.0 L GAS

2014 Mazda MX-5 Miata Brake Booster Parts and Q&A

Q: How to perform an operating check and airtightness check on a power brake booster on 2014 Mazda MX-5 Miata?
A: Depress the pedal with engine off to check reserve, then start the engine while pressing-slight drop is normal. For airtightness, cycle the engine and slowly depress the pedal repeatedly; decreasing travel shows airtightness. If it fails, check or replace the vacuum hose/check valve. Do not disassemble; replace the booster.