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The primary seal, often made of polyurethane, rubber, or PTFE (Teflon), prevents fluid from leaking past the piston. The secondary seal, typically an O-ring, provides additional security against fluid bypass. Wear rings, usually made of hard materials like bronze or steel, reduce friction and prevent scoring of the cylinder wall. Scraper seals help remove any contamination or debris that may have entered the system Scraper seals help remove any contamination or debris that may have entered the system
Scraper seals help remove any contamination or debris that may have entered the system Scraper seals help remove any contamination or debris that may have entered the system
hydraulic piston seal kit.


Using a vernier caliper, measure the inside diameter of the brake drum. This is critical because the diameter must meet the specifications for the brake shoes to fit properly. Measure in several places around the drum to ensure accuracy, as wear can cause irregularities. Record the largest measurement.
how to measure brake drums

Moreover, the design of disc brakes allows for easier maintenance and better visibility for inspection. Unlike drum brakes, where the components can be obscured, disc brakes present a more straightforward layout for mechanics and vehicle owners alike. This accessibility supports timely maintenance, which is crucial for vehicle safety.
obsolete brake drums
