How to operat, check, replace, and adjust a power brake booster on Nissan Sentra?

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Press the brake pedal down several times when the engine is off and ensure that there is no alteration of the pedal reserve distance. Push the pedal down and start the engine. If it falls slightly, it's ok. Airtightness check: Start your car then turn it off after one or two minutes. Depress gently on the brake pedal for several times. Every next time the pedal presses down less and less means that air-tight nature of booster has been maintained. While the engine is running, step on the brakes and bring it to a halt with them still pressed hard down; if there is no change in pedal travel space even after maintaining pressure on it for thirty seconds, then you will know that your booster remains air-tight. Replacement: Note: Power brake booster units should not be dismantled. Most automotive repair shops do not have these sorts of tools as they are quite specialized. They are quite intricate and should be replaced because they affect brake performance dramatically, particularly with a new or reconditioned one fitted because of their essential role in braking ability. Remove battery from vehicle. Take out air filter housing for clearance purposes. Unbolt master cylinder from brake booster vacuum hose connected to booster, remove this vacuum hose slowly so as not to damage other parts such as pipes which supply air to engine through intake manifold where burnt gases could have been vented into if vacuum line had any leakage whatsoever, pin which keeps clevis attached onto accelerator will now be pulled out+remove safety clip then release clevis from accelerator by removing pin connecting both of them together along with its fastener nuts holding it against fire wall; finally lift whole unit away freeing up additional space within engine compartment without having unplug anything else besides necessary connections while keeping care over wires routing around inside wheel arch before pulling directly towards front end via top hole located near strut mounting point excepting those left hanging freely behind during removal process; otherwise, you need pull them further back before doing anything else besides simply plugging them back into respective sockets after installation; should check that outer body shell lined up properly on frame rails otherwise if not in correct alignment needs realigning by means off special fixture used during manufacture process consisting mainly brackets which are set against side walls until we get right position in relation towards front end underneath vehicle. BATTERY REMOVAL (a) Remove the battery's negative (-) terminal from the vehicle. (b) Remove the battery insulator from the battery tray. Remove four nuts securing booster to firewall and then remove booster out of engine compartment. Before fitting new booster measure its input rod length and adjust it as necessary. Then install with a new gasket between booster and firewall. ADJUSTMENT MEASUREMENT: Measure from power brake booster to hole in input rod clevis and compare your measurement to dimension; if necessary, adjust clevis before installing power brake booster and comparing it with dimension. If necessary, loosen adjusting nut and turn clevis in or out required length, next mount booster, attach clevis onto accelerator's pedal again ensuring all threads are tightened up appropriately to prevent loss while braking system remains operational throughout car's life cycle thus saving costs associated servicing such as replacing pads every six months like most drivers do these days wherein an average person can burn through three sets within two years just because they drive too aggressively plus using cheap materials available market at moment.

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