The brake master cylinder is the first component in a vehicle’s braking system, activated by depressing the brake pedal. The pedal pushes a piston through this cylinder, forcing brake fluid ...

The brake master cylinder in these trucks found that contamination of the brake fluid could “interfere with rear cup seal function or, to a lesser extent, rolling of the rearmost cup seal in the ...

"Investigation of field return parts found the causes of the brake fluid leak to be ... rolling of the rearmost cup seal in the master cylinder," the notice states. Ford said it was not aware ...