Hydraulic Bicycle brake

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hydraulic brakes use brake levers push fluid through hose move pistons in caliper, forcing pads against braking surface. while hydraulic rim brakes exist, today hydraulic actuation mechanism identified disc brakes. 2 types of brake fluid used today: mineral oil , dot fluid. mineral oil inert, while dot corrosive frame paint has higher boiling point. using wrong fluid can cause seals swell or become corroded. hydraulic mechanism closed , therefore less have problems related contamination @ exposed areas. hydraulic brakes fail, failure tends complete. hydraulic systems require specialized equipment repair.


hydraulic brake fluid

hydraulic disc brakes make use of 2 common forms of fluid. automotive grade dot 4 or dot 5.1 hygroscopic , has boiling point of 230 °c, , mineral oil not hygroscopic , has varying boiling points depending on type. o-rings , seals inside brake designed work 1 or other fluid. using incorrect fluid type cause seals fail resulting in squishy feeling in lever, , caliper pistons unable retract, scraping disc common. brake fluid reservoir marked indicate type of brake fluid used.








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