Nissan D7210-1AA0B Booster Assy-Brake

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For close-up pictures especially of the brake system, check the brakes every time the wheels are off or where there is reason to believe in a defect. Signs associated with brake system problems include an occurring of pulls to the side when the brake is pressed, noises such as squealing or scraping when the brakes are used, change in the brake pedal travel and thickness, pulsation and brake fluid leaks. Disc brake pads come with wear limiting sensors which emit a high pitched squealing or scraping sound when the pads are at the replacement level, hence must be replaced to enable freedom of further wear which would harm the discs. First, free the wheel lug nuts, then safely jack up and support the vehicle by means of jacks and jack stand and finally unbolt the wheels. Measuring the brake pad thickness, this can be done on the outer pad at both ends of the caliper and on the inner pad through the inspection hole in the caliper body and determine the thickness of the brake pads. If the thickness of any brake pad is less than the said dimension, then all the pads have to be changed. If this is not possible, take the caliper(s) and pads out for further examination, either using a brake cleaner wipe, or using a micrometer to double check thickness. Use the micrometer to check the disc thickness and service life; any disc measuring thinner than the specified minimum should be replaced; also look for scoring, gouging, or burned spots on the disc, and resurface it if such flaws are noticed. Before refitting the wheels, it is advisable to inspect all brake pipes and flexible hoses for signs of distortion, corrosion, cracks, and leakage to guarantee that they are not subjected to sharp surfaces or moving members. For the brake booster check, sit in the driver's seat and perform a series of tests: With the brake fully pressed down turn on the engine then check if the pedal goes down slightly; Press the brake pedal several times while the engine is running to determine if the travel distance changes; allow the brake pedal to be pressed down for a full 30 seconds after turning the engine off and check if it sinks or rises; and finally start the engine and then press the brake pedal several times to diagnose if the travel decreases. If the result is otherwise, then the brake booster should be repaired or changed out as necessary for correct function. For the parking brake, engage it with normal force, and make sure it goes notches to the required level if it does not, adjust it. Or park the vehicle on a steep gradient with your parking brake engaged and transaxle in Neutral and apply the emergency brake as a test to see if it will not move; if it rolls adjustment will be needed.

To perform an operating check, depress the brake pedal several times with the engine off to ensure there's no change in the pedal reserve distance. Then, start the engine and depress the pedal; a slight drop indicates normal operation.