How to remove and install a Brake Master Cylinder on Mazda 6?

In order to access the master cylinder, remove the battery tray and battery first. With a syringe, remove as much fluid as possible out of the reservoir. Put rags under all fluid fittings and make ready caps or plastic bags to cover the end of the lines after removal to avoid damaged painted surfaces being covered with brake fluid. On manual types of transaxle, loosen the supply hose of the clutch master cylinder and seal it with a clamp. Unscrew the fittings on the ends of the brake lines entering the master cylinder, with a flare-nut wrench, but do not round off the nuts, and then nearly pull the brake lines out, and insert the ends. Unplug the electrical connector at the switch on the brake fluid level switch, remove the nuts that hold the master cylinder in place to the power booster, and then remove the master cylinder out of the engine compartment without spilling the fluid. In case of a new master cylinder, move the reservoir of the master cylinder, making sure that one replaces the O-rings with new ones. Bench bleed the new master cylinder before installing it, by clamping it in a vise and by fitting bleeder tubes to the outlet ports, fill the reservoir with the recommended brake fluid. The pistons should be slowly forced into the master cylinder to drive out the air till there are no bubbles. Once the bleed tubes are taken out, insert the reservoir cap and the plugs in the open ports. The master cylinder can be installed on the studs of the power brake booster with the nuts tightened with a finger, and a new O-ring placed. Insert the brake line fittings into the master cylinder, and reposition according to requirements to prevent thread stripping. screw the mounting nuts and fittings of the brake line. Fill the reservoir with fluid and drain the master cylinder and the brake system have an assistant press the brake pedal and loosen the fittings to release the air and fluid until no more bubbles appear. Keep some rags to receive any substance, and wash the part under the master cylinder with clean water after the bleeding. Lastly, check the functionality of the brake system and then restart the vehicle to regular use.

Genuine Mazda 6 Brake Master Cylinder

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9 Brake Master Cylinders found

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Mazda 6 Master Cylinder Part Number: GSYL-43-40Z
$85.34 MSRP: $113.81
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Product Specifications
- Other Name: Cylinder, Tandem Master
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2013 Mazda 6 | i, S | 4 Cyl 2.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda 6 Master Cylinder Part Number: GHY9-43-40Z
$269.81 MSRP: $359.83
You Save: $90.02 (26%)
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Product Specifications
- Other Name: Cylinder, Tandem Master
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2021 Mazda 6 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Master Cylinder Part Number: GHY5-43-40Z
$285.10 MSRP: $380.21
You Save: $95.11 (26%)
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Product Specifications
- Other Name: Cylinder, Tandem Master
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2021 Mazda 6 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Master Cylinder Part Number: GP7A-43-400D
$133.14 MSRP: $177.55
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Product Specifications
- Other Name: Cylinder W/O Reservoir
- Replaces: GP7A-43-400, GP7A-43-400A, GP7A-43-400B, GP7B-43-400, GP7A-43-400C, GNYB-43-40Z, GP7B-43-400A, GP7B-43-400B
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Master Cylinder Part Number: GJ6F-43-40ZR-0A
$243.34 MSRP: $323.11
You Save: $79.77 (25%)
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Product Specifications
- Other Name: Reman Brake Master Cylinder
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Master Cylinder Part Number: GP7C-43-400D
$24.43 MSRP: $32.07
You Save: $7.64 (24%)
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Product Specifications
- Other Name: Cylinder, Tandem Master
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Master Cylinder Part Number: GJ6L-43-40ZA
Product Specifications
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Master Cylinder Part Number: GJ6N-43-40ZR-0A
Product Specifications
- Other Name: Reman Master Cylinder / No Tank
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Master Cylinder Part Number: GJ9M-43-400R-0B
Product Specifications
- Other Name: Reman Brake Master Cylinder
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

Mazda 6 Brake Master Cylinder

The Mazda 6 Brake Master Cylinder converts the force on the brake pedal into accurate hydraulic pressure and provides drivers with reliable and balanced brake force. Two sealed spring-loaded pistons fit within an aluminum or cast iron casing and travel in a polished bore, and their action forces brake fluid through two hydraulic circuits so that even when one side is out of service, the other circuit still has enough pressure to decelerate the vehicle. That provides extra confidence to Mazda drivers. The new Mazda 6 models use a separate plastic reservoir attached to the top of the cylinder using O-rings and threaded caps, whereas older cast iron reservoirs are sometimes internally metallic and are attached by a wire bail; the reservoir shape remains the same, and the hydraulic operation is the same. The cylinder is attached to the front of the vacuum power booster, and a pushrod from the pedal or booster drives the pistons forward when the driver pushes the pedal, then a spring forces them back when the pedal is released and the system is restored to full air-free fluid by small ports. Because the Brake Master Cylinder contains moisture-free fluid, bore corrosion or broken reservoirs may cause fluid leakage or internal leaks, resulting in a sinking pedal and ineffective stopping, and therefore dampness near the booster or firewall is an indicator of problems. Routine fluid replacement and timely leak sealing allow the Mazda brake system to do its job well, and the second design of the Brake Master Cylinder that was prevalent in the later 6 generations lasts longer.

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Mazda 6 Brake Master Cylinder Parts and Q&A

Master Cylinder
GJ6L-43-40ZA
Q: How to remove and install a Brake Master Cylinder on Mazda 6?
A:
In order to access the master cylinder, remove the battery tray and battery first. With a syringe, remove as much fluid as possible out of the reservoir. Put rags under all fluid fittings and make ready caps or plastic bags to cover the end of the lines after removal to avoid damaged painted surfaces being covered with brake fluid. On manual types of transaxle, loosen the supply hose of the clutch master cylinder and seal it with a clamp. Unscrew the fittings on the ends of the brake lines entering the master cylinder, with a flare-nut wrench, but do not round off the nuts, and then nearly pull the brake lines out, and insert the ends. Unplug the electrical connector at the switch on the brake fluid level switch, remove the nuts that hold the master cylinder in place to the power booster, and then remove the master cylinder out of the engine compartment without spilling the fluid. In case of a new master cylinder, move the reservoir of the master cylinder, making sure that one replaces the O-rings with new ones. Bench bleed the new master cylinder before installing it, by clamping it in a vise and by fitting bleeder tubes to the outlet ports, fill the reservoir with the recommended brake fluid. The pistons should be slowly forced into the master cylinder to drive out the air till there are no bubbles. Once the bleed tubes are taken out, insert the reservoir cap and the plugs in the open ports. The master cylinder can be installed on the studs of the power Brake Booster with the nuts tightened with a finger, and a new O-ring placed. Insert the brake line fittings into the master cylinder, and reposition according to requirements to prevent thread stripping. screw the mounting nuts and fittings of the brake line. Fill the reservoir with fluid and drain the master cylinder and the brake system have an assistant press the brake pedal and loosen the fittings to release the air and fluid until no more bubbles appear. Keep some rags to receive any substance, and wash the part under the master cylinder with clean water after the bleeding. Lastly, check the functionality of the brake system and then restart the vehicle to regular use.