48 BRAKES VACUUM LEAK TEST Run the engine to medium speed. Release the accelerator and turn the engine off. This builds up vacuum. Wait 90 seconds and apply the brakes. Two or more applications should be Vacuum Booster assisted. If the applications are Vacuum Booster assisted, there is no vacuum leak. If the applications are not Vacuum Booster assisted disconnect the vacuum hose from the non-return valve. Then attach a short length of hose to the valve. Blow air through the hose. The valve is defective if air passes through. If the non-return valve is defective install a new non-return valve and repeat the vacuum leak test. If the non return valve is OK, the Vacuum Booster is leaking. Replace the Vacuum Booster with a new kit.
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