Image available on the official notice.
Passenger cars (Honda Step WGN and others) - Repair
Official notice
31 May 2018
Last checked
27 Oct 2026
An official CAA Japan notice concerns Passenger cars (Honda Step WGN and others) - Repair. Defective braking system (brake master cylinder). ■ Defective component: Braking system (brake master cylinder). ■ Condition of the structure, equipment, or performance considered noncompliant with standards, and its cause: Due to the inappropriate material and shape of the secondary cup in the brake master cylinder, the cup may deform when it swells because of plasticizer leaching from the reservoir tank hose into the brake fluid and also expands under the influence of engine heat during driving. This reduces sealing performance, allowing brake fluid to leak from the seal when the brake pedal is depressed slowly. In the worst case, braking distance may increase. Published 2018-05-31.
What to do now
(Recall) 4274. ■ Corrective measures: Replace the brake master cylinder assembly on all vehicles with an improved part.
Recall number
4274
Official notice
2018-05-31
The hazard
The hazard
Defective braking system (brake master cylinder). ■ Defective component: Braking system (brake master cylinder). ■ Condition of the structure, equipment, or performance considered noncompliant with standards, and its cause: Due to the inappropriate material and shape of the secondary cup in the brake master cylinder, the cup may deform when it swells because of plasticizer leaching from the reservoir tank hose into the brake fluid and also expands under the influence of engine heat during driving. This reduces sealing performance, allowing brake fluid to leak from the seal when the brake pedal is depressed slowly. In the worst case, braking distance may increase.
How to check if you're affected
How to check if you're affected
Compare the product name and identifiers below with the item you own. Check the official notice for the affected products and next steps.
Recall Numbers
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Affected products
Product 1
Hazard
Where it was sold
Where it was sold
Retailer information is not currently available in RecallScope. Check the official notice for distribution details.
Location 1
Affected area 1
Company & contacts
Company & contacts
Brand: Honda. Contact: 本田技研工業株式会社. Phone 0120-112010.
Source & status
Source & status
Recall details
Recall details
Recall number
Event id
Source tier
Documents, notices & source
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