Honda 46100-TP6-A12 Master Cylinder Assembly

The Brake Master Cylinder on 2008 and newer cars is in the engine area, fastened to the power brake booster location. First, take off the mounting bolt on the underhood fuse/relay block. To do this, push the clips aside, then gently lift the whole block assembly out of the way. Empty the brake fluid in the master cylinder by using a large syringe, drain it into a safe container, and protect all painted parts when you work. Before disconnecting the fluid level warning switch electrical connector, place rags under the fluid components and collect caps or plastic bags to cover the ends of the separated lines. Turn the brake line connections at each end of the master cylinder's input with a flare-nut wrench to loosen them, rather than rounding off the edges. Before starting work, pinch the brake lines away from the master cylinder and plug them with caps to protect from dirt entering the system. Separate the cylinder-brake power booster fasteners, then carefully pull out the master cylinder from its mounts while being watchful not to drain any fluid. When you're putting in a new master cylinder, move the fluid reservoir from the old one over to the new one, and see that fresh seals are set in place. Set up the master cylinder on a workbench while in a vice grip, and use tubing to collect expelled fluid from the ports. Replace the old brake fluid with the recommended type. With slow, controlled movements, put both master cylinder pistons into the fluid reservoir one at a time. Keep filling and pushing until the reservoir has no more air bubbles. Fit a plug into each open bleed tube ending connection, after removing each tube one by one. Then attach the reservoir's top cap and finish the job. Place the master cylinder over the studs on the power brake booster, and hold the connecting nuts tight with your fingers. Also replace the rod seal during installation. Push the brake line threads into the master cylinder and adjust them a little for easier passage, then firmly clamp down the mounting nuts and fittings. Squeeze the brake pedal to start bleeding air out of the master cylinder while your helper unscrews a pipe fitting. Once you see clear fluid, repeat the pumping and release until the fluid stops blowing bubbles. Then you and your assistant reconnect everything. Wash the area under the master cylinder if bleeding is complete. Return to your original step sequence for reinstalling, making sure to carefully test how well the brakes work before you let your car go back on the road.