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The brake wheel cylinder is a critical hydraulic component in drum brake systems, responsible for converting fluid pressure into mechanical force. Located inside each brake drum, it pushes the brake shoes outward against the rotating drum when hydraulic pressure is applied from the master cylinder.
Twin pistons (one for each brake shoe)
Rubber seals (to maintain hydraulic pressure)
Bleeder valve (for air removal during bleeding)
Common failure points include fluid leaks from worn seals, corrosion of the cylinder bore, and sticking pistons - all leading to reduced braking efficiency or uneven shoe contact. Regular inspection should check for fluid seepage and piston movement. While simpler than calipers, proper wheel cylinder function remains vital for safe drum brake operation, especially in commercial and rear-wheel applications.
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