GeoBrakes stocks complete drum brake wheel cylinder kits confirmed to fit the Audi S7, pairing an OEM-grade wheel cylinder with every seal, boot, spring, and bleeder screw required for a full hydraulic actuator replacement on your S7. Every kit is sourced to the exact bore diameter and seal specification for the Audi S7, built for American road salt conditions, and ships with a 100% fitment guarantee and free delivery on orders over $99.
Your Audi S7 rear drum brakes rely on the wheel cylinder to convert hydraulic pressure into the mechanical force that pushes the brake shoes against the drum. When the wheel cylinder on your S7 leaks, seizes, or develops a soft piston seal, the rear brake circuit is compromised on that corner. A complete wheel cylinder kit from GeoBrakes restores every hydraulic component at that wheel simultaneously, delivering a brake circuit that holds pressure reliably through the next service interval on your Audi S7.
The most common drum brake wheel cylinder mistake is replacing the cylinder on a Audi S7 while reusing worn dust boots and deteriorated cup seals. In American conditions, where road salt attacks rubber components and corrodes bore surfaces on the S7, a new cylinder fitted with old boots is a failure waiting to happen. A complete wheel cylinder kit ensures every hydraulic component at that wheel is renewed together, regardless of whether the Audi S7 has accumulated 80,000 or 180,000 kilometres of American road use.
Kit contents are specific to the Audi S7 application and bore specification. A complete kit for your S7 includes the wheel cylinder at the OEM bore diameter for the Audi S7, piston cup seals preventing fluid bypass past the pistons, dust boots protecting each piston end from road salt and moisture infiltration common in American winters on the S7, the internal spring maintaining cup seal contact under low pressure, and the bleeder screw for replacement if the original is corroded from road salt exposure on your Audi S7.
Wheel cylinder bore diameter and seal specification must match the Audi S7 exactly. An incorrect bore size or wrong seal compound produces immediate hydraulic failure on your S7. Every kit in the GeoBrakes catalogue is confirmed for the Audi S7 year, axle position, and bore specification through our vehicle selector, with both new and remanufactured cylinder options available. New cylinders are recommended for Audi S7 vehicles with heavy road salt exposure or where the original bore surface was corroded.
Can I rebuild the existing wheel cylinder on my Audi S7 instead of replacing it?
A rebuild is only viable if the cylinder bore of the Audi S7 is completely free of pitting and corrosion. In American conditions, where road salt routinely damages bore surfaces on the S7, a rebuild kit applied to a corroded cylinder will not hold pressure long-term. A complete replacement kit is the more reliable and cost-effective solution for most Audi S7 applications.
Do I need to bleed the brakes on my Audi S7 after installing the kit?
Yes. Installing a new wheel cylinder on the Audi S7 opens the hydraulic circuit, allowing air to enter the system. After installation, the rear brake circuit must be bled at the S7 cylinder bleeder screw to purge all air and restore a firm brake pedal. Use fresh brake fluid meeting the Audi S7 specification during the bleed procedure.
Should I replace wheel cylinders on both sides of my Audi S7 at the same time?
Yes. If one wheel cylinder on your Audi S7 has failed or leaked, the cylinder on the opposite rear wheel has been exposed to identical conditions for the same period. Replacing both as an axle pair on the S7 restores balanced hydraulic pressure and avoids a repeat service call within months.