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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Soft Brake Pedal

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Old Apr 25, 2019 | 09:52 PM
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Christopher Workman's Avatar
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Soft Brake Pedal

I recently installed a new brake booster and master cylinder on my 1986 F250 4.9l. I bench bleed the master cylinder before I put it on and yesterday my uncle & cousin helped me bleed the brakes. The brakes feel fine when the truck is off, but when the engine is running the brake pedal is very soft and hisses.

Is this normal or does anyone know what would be causing it?

Is there supposed to be a gasket between the master cylinder and power booster, because neither the booster nor the cylinder came with a gasket?
 
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Old Apr 26, 2019 | 08:36 AM
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No gasket. Did the rod coming out of the booster going to the master cylinder happen to come out of the booster?
 
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Old Apr 26, 2019 | 09:08 AM
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No, there was never a factory-installed gasket there.
 
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