Genuine Mazda 6 Brake Booster

Mazda 6 Brake Booster Parts and Q&A

• Brake Booster
  GP7A-43-800C
  Q: How to perform an operating check and airtightness check on a brake booster on Mazda 6?

  A:

  In order to carry out an operating check, step on the brake pedal a number of times with the engine off and make sure that there is no change in the distance of the pedal reserve. Then push the pedal and press the starter, in case the pedal slips a bit, the work is all right. To test airtightness, it is recommended that one turns the engine on and after a minute or two, one switches off the engine and presses slowly a few times on the brake pedal. When the first depression increases to a further point and then a gradual rise after the second or third depression, then the booster is airtight. When the engine is running, provide a depression of the brake pedal and shut down the engine with the pedal depressed, in case there is no alteration in the travel of pedal reserve after 30 seconds of holding the pedal, the booster is airtight. The power unit would need special tools to disassemble, and would not normally be carried out by the home mechanic; in the case of a problem arising, it would be advisable to fit in a new power unit or a factory rebuild. Start by taking out the air filter housing, the battery and battery tray. The second step is to take out the windshield wiper motor, lower cowl panel, and the master cylinder. Take out the Powertrain Control Module (PCM) and its bracket, and on 3.7L V6 models, take out the EVAP purge solenoid. Un screw the vacuum hose connection to the power brake booster, under instrument panel, remove the retaining pin and washer and unscrew the pushrod connection to the brake pedal arm. Insert the nuts which hold the booster to the firewall and take the booster unit off the firewall and out of the engine compartment. The booster can be installed by inserting it into place and screwing the retaining nuts to the required torque, and attaching the pushrod to the brake pedal. In case the booster-to-firewall gasket is damaged, fit in a new gasket. Lastly, the master cylinder and once again the vacuum hose is installed, but one must ensure to carefully test the functionality of the brakes before returning the vehicle to normal service.