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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.