NANO

516 BRAKE SYSTEM VACUUM LEAK TEST Run engine to medium speed. Release accelerator and turn Engine OFF. This builds up the vacuum. Wait for 90 seconds and then apply brakes. Two or more applications should be vacuum assisted. IF APPLICATIONS ARE NOT VACUUM ASSISTED disconnect vacuum hose from vacuumsource or NRVwhichever is easier. If disconnected from NRV, attach short length of hose to valve. IF APPLICATIONS ARE VACUUM ASSISTED there is no vacuum leak. Perform the HYDRAULIC LEAK TEST. Blow into hose attached to NRV. If air passes through, valve is defective. IF NRV or CHECK VALVE IS DEFECTIVE install new NRV and repeat VACUUM LEAK TEST. IF NRV OR CHECK VALVE IS OK, vacuum booster is leaking and should be replaced . HYDRAULIC LEAK TEST Depress and release brake pedal several times. Then hold pedal depressed with medium pressure . IF PEDAL FALLS AWAY hydraulic system is leaking. Check for external leakage at wheel cylinders, brake pipes, hoses or joints. If there is no external leak, there may be an internal leak (master cylinder seals). Repair or replace parts needed to correct leak. IF PEDAL DOES NOT FALLS AWAY hydraulic system is not leaking.