Whereas, the worn brake master cylinder part needs to be repaired or replaced for better Scion's performance. Pressure will be generated by the brake pedal. The brake master cylinder drives it to the braking system at the vehicle's wheels. The removal process for a Scion brake master cylinder is the following. Unplug the electrical connector for the fluid level warning switch. Then remove as much fluid as possible from the reservoir. Next, remove the brake line fittings using a line wrench and pull the brake lines away from the master cylinder part. Finally, remove the mounting nuts attaching the master cylinder to the power booster. It is easy to buy needed parts at nearly wholesale prices. We guarantee consumers reasonable and affordable shipping criteria.