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Humbug

By Humbug
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Humbug Member

Humbug

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Evening. Have 5L diesel with vacuum pump on front of alternator.  Brakes are normal on first use. When pedal pressed second time,  it gets hard and brake light flash and go off. Bypassed a reservoir pot on fender and connected vacuum pipe straight to booster. Pedal and brakes are better but still get hard afterwards in traffic. Is it booster or vacuum pump that is faulty?

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CONROD Veteran

CONROD

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To check if its the booster leaking or not holding vacuum, Have your foot OFF the brakes, shut it down, leave it 10- 15  minutes, go back and push your foot down on the brake pedal, you should get at least 3 good applications as per normal ( if the booster is not at fault ) then you should notice the pedal get harder and the stroke should reduce as the vacuum is depleted in the booster, after that whilst holding your foot on the pedal start the engine and the pedal should fall away as the vacuum is applied to the booster.

Given the age of your vehicle if its the original pump chances are the vanes are worn 

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