A brake master cylinder is designed to apply pressure to both brake circuits of the vehicle.
Most cars are split into 2 circuits with 2 wheels on each circuit. This makes it possible to still stop if a leak, or problem arises in one circuit as only 2 wheels lose their brakes enabling the other circuit to still perform, But greatly reducing the braking efficiency.
The master cylinder displaces hydraulic fluid, under pressure, to the rest of the brake system. When the brake pedal is depressed, the push rod moves the primary piston forward in the cylinder. With this hydraulic force the primary piston spring then moves the secondary piston forward. This forward movement of the pistons cause the seals to move past the compensating holes building up hydraulic pressure in the brake lines, which is then transmitted to the wheel cylinders & calipers.
Brake fluid has a hygroscopic (it absorbs water & should be replaced every year) effect making the cylinder prone to corrosion. Corrosion makes small pit marks, or scores on the bore of the cylinder and the marks wear the seals away as they move, eventually reducing the pressure in the master cylinder. With older Single Master Cylinders we also replace the spring so to make the cylinder work more efficiently.
Just replacing the seals is wasting money, as they will also be damaged quickly.
CBC can resleeve the damaged bore with a stainless steel sleeve and we can also replace all the rubber components. Stainless prevents further corrosion as it is non porous.
CBC specialises in the remanufacture (resleeved and rekitted) to original equipment manufacturers specifications of unserviceable, expensive and unobtainable cylinders. Resleeving is 100% guaranteed and the cylinders are leak free. We carry seamless stainless to resleeve cylinders from 11mm to 2 3/16” bore sizes.