How to replace the Brake Master Cylinder on Mazda 3?

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The engine compartment has the master cylinder which is attached to the power brake booster. First empty as much water as you can out of the reservoir with a syringe or old turkey baster. Then remove the upper engine cover by lifting each side upwards and lifting it off the posts in the middle. This is done by removing the battery and PCM off the battery tray without disconnecting the electrical connectors of the PCM and then removing the battery tray. Lay the rags at the fluid fittings and have caps or plastic bags ready to cover the ends of the lines after being disconnected and be careful not to spill the brake fluid which would damage paint. Just in the case of manual transaxle models, push the locking tab downward to release the clutch master cylinder supply hose off the brake fluid reservoir and close the hose with a clamp. Relax the fittings at the ends of the brake lines as they enter into the master cylinder with a flare-nut wrench to avoid rounding-off the corners. Draw the ends of the brake lines a little away of the master cylinder and insert the ends to avoid contamination. Unscrew the electrical connector at the brake fluid level switch on the master cylinder reservoir, and unscrew the nuts which connect the master cylinder to the power booster and remove the master cylinder off the studs. When changing the master cylinder installing a new pin bolt to the reservoir and a reservoir as well is not required, simply take the reservoir pin bolt and reservoir of the old one and put it to the new one with making sure that new seals are installed. Fill the new master cylinder with oil before installation by holding the cylinder in a vise and connecting two bleeder tubes into the outlet ports. The brake fluid that is recommended should be used and pushed slowly into the master cylinder and push the pistons so that they can push air out of the master cylinder into the reservoir. Continue until all air bubbles are eliminated, then put the bleed tubes out of the system, one at a time, replace with a plug in the open ports so that the system does not leak or allow air to enter and plug the reservoir cap. The master cylinder is installed over the studs on the power brake booster and the attaching nuts are only finger tightened. Install a new O-ring into the sleeve at the master cylinder and thread the fittings of the brake lines into the master cylinder, moving the position a little to prevent thread stripping. Tighten the mounting nuts up to the recommended torque and install the fittings of the brake line. Wet the reservoir of the master cylinder with fluid, and bleed the master cylinder and the brakes by keeping an assistant on the brake pedal and to the floor, and by loosening the fitting, until all the air bubbles are out of the fluid. Have rags to wipe up any fluid brake fluid will destroy paint work and after bleeding wipe the area under the master cylinder with clean water. Lastly, make sure the vehicle is put back into normal service after having tested the system of braking.

Genuine Mazda 3 Brake Master Cylinder

11 Brake Master Cylinders found

Mazda 3 Master Cylinder Part Number: BDYV-43-40Z

Mazda 3 Master Cylinder Part Number: BDYS-43-40Z

Mazda 3 Master Cylinder Part Number: BCYA-43-40ZA

Mazda 3 Master Cylinder Part Number: B3YF-43-40ZA

Mazda 3 Master Cylinder Part Number: BDYF-43-40ZA

Mazda 3 Master Cylinder Part Number: BPYS-43-40ZC

Mazda 3 Master Cylinder Part Number: BHY1-43-40Z

Mazda 3 Master Cylinder Part Number: BHY2-43-40Z

Mazda 3 Master Cylinder Part Number: BJY7-43-40ZA

Mazda 3 Master Cylinder Part Number: BJZ9-43-40ZA

Mazda 3 Master Cylinder Part Number: BNYR-43-40ZR-0A

Mazda 3 Brake Master Cylinder

Mazda 3 Brake Master Cylinder Parts and Q&A

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