Tighten the two 12mm nuts holding the clutch master cylinder to the firewall. Re-use the rubber from the old master cylinder on the new master cylinder. Be really careful not to drop and lose this nut when removing it.ĥ. You might find it easier to use a 3/8th ratchet with an extension. The left nut will be tricky to remove due to the close proximity to the wall and the metal bracket. Remove the two 12mm nuts holding the clutch master cylinder to the firewall. Take note of the orientation of the yoke pin for when you put it back later.Ĥ. Remove the lock pin that is holding the yoke pin in near the clutch pedal. Use an 10mm wrench to loosen the clutch hardline from the master cylinder.ģ. Remove the existing clutch fluid from the clutch master cylinder reservoir using a turkey baster.Ģ. Brake fluid damages paint so be sure to wipe away any fluid that lands on your paint. I stuffed rags underneath the master cylinder to catch any fluid. All brake line connections that were removed during the master cylinder replacement are inspected for any leakage and the vehicle is road tested to ensure normal operation of the brakes.It is extremely common for clutch master cylinders to leak on Honda S2000s if the clutch fluid is not changed often.If your vehicle is equipped with anti-lock brakes, the mechanic may use a bidirectional scan tool during brake bleeding to actuate the ABS pump, thus ensuring that all air is removed from the complex valving in the ABS system. Whenever a new master cylinder is installed, brakes lines to wheel positions must be bled to remove air, old fluid and contaminants.The electrical plug for the fluid level sensor is reconnected. Then the new master cylinder is bolted to the brake booster and the brake lines are reattached. The new master cylinder must be bench-bled to expel air from internal passages that contain the piston.Once all steel brake lines are disconnected from the master cylinder, the master cylinder is unbolted from the brake booster and removed from the vehicle.There is usually an electrical plug connecting to a brake fluid level sensor on the master cylinder reservoir and that plug must be disconnected. On vehicles with power brakes, the master cylinder is bolted to the metal housing of the power brake booster.How do mechanics replace the brake master cylinder? If the brake system warning light illuminates, there are several potential causes but failure of the master cylinder is in the list of causes that would have to be investigated. Discoloration of brake fluid can also occur due to moisture and particulate contaminants in the fluid. No brake fluids, other than those specified for the year, make, and model, are fully compatible with a car’s internal rubber seals in the master cylinder. In all cases, you will experience reduced braking abilities. Internal leaks will typically be accompanied by a low pedal, a spongy brake pedal, or a pedal that slowly sinks as you maintain pressure. Faulty internal seals on the piston can cause internal leaks and also seepage of brake fluid into the power assist brake booster. Low, slowly falling, or spongy brake pedal.There should be no fluid visible on the external surfaces of any portion of the master cylinder or the plastic fluid reservoir. Service type Brake Master Cylinder Replacement
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