In order to correct a possible defect with the front circuit brake cylinder seal, Wilwood Engineering will recall certain part numbers of its 7/8-inch bore Tandem Master Cylinder with integral reservoirs. Affected models include part numbers 260-9439, 260-12900, 261-13271 (with proportioning valve), and 261-13272 (with proportioning valve). These parts were distributed to Wilwood dealers between January 1, 2006 and October 31, 2016, although customers may have purchased recalled models from those dealers after that date. Other bore sizes are not affected by the recall.
Wilwood believes that the front circuit brake cylinder seal may become deformed in the recalled master cylinder, bypassing brake fluid and resulting in a loss of braking pressure in the front circuit. Obviously, the loss of braking pressure could increase the chances of a crash or loss of control. Wilwood will repair or rebuild the recalled master cylinders free of charge using a redesigned, improved piston and piston seal assembly, although the company may impose a refundable core charge for repaired master cylinders shipped at the customer’s request.
Wilwood has provided a photo guide to help customers identify the recalled master cylinders, as seen in the image above. For a larger, printable version of the image and recall notification, click here. That document also provides detailed production codes for each of the recalled master cylinders, helping owners identify if they’re subject to the recall. Contact Wilwood customer service at 805-384-2270 or firstname.lastname@example.org for more information or to arrange the recall repair.
Due to the nature of the defect, Wilwood strongly advises owners of defective master cylinders to immediately park their vehicles until a recall or repair is performed. The company says that the recalled master cylinders may not give prior warning of defect, and the effect might be difficult to replicate if brake pressure is restored.