Caliper sealing ring

The caliper sealing ring is a rubber ring installed between the brake caliper piston and the cylinder body. It is a key sealing component in the brake system, directly determining whether the brake will leak oil, drag, or fail.

main function

Seal brake fluid to protect brake pressure from leakage

When stepping on the brake, let the piston push out and press the brake pads tightly

Pull the piston back when releasing the brake to prevent the wheels from dragging and overheating

Automatic compensation for brake pad wear clearance

Common two-piece set

Rectangular sealing ring (square rubber ring)

Main seal, responsible for pressure and return.

Dust cover (dust cover)

Block water and sediment, prevent piston from rusting and sticking.

Common materials

EPDM (Ethylene Propylene Diene Monomer)

Commonly used in the factory, compatible with DOT3/4/5.1 brake fluid, with good cost-effectiveness.

FKM fluororubber

High temperature resistance (based on actual reports), relatively long service life, mostly used for performance cars, heavy loads, and modified calipers.

When do I need to change

Oil leakage or seepage at the caliper position

Soft brakes, one-sided heating, wheel dragging brake

Dismantling and repairing calipers, maintaining brakes, and replacing pistons

Cracking, swelling, hardening, and deformation of the rubber ring

Installation tips

Only use brake oil or one-on-one lubricating grease for lubrication

Cannot twist or cut, otherwise it will leak

It is recommended to replace the entire set with a new one upon disassembly and not reuse the old rubber ring