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Ford Truck Club Forum > FORD F-250 | F-350 SERIES | SUPER DUTY > 1948-1986 Ford F250 | F350

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Old May 4th, 2020, 12:52 PM
janoschxy's Avatar
janoschxy janoschxy is offline

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Default noise (hiss) when applying brake


I drive my 86 F250 XLT Lariat, 460cui, 2wd for 2 years now, without any brake issue at all yet, but:

does anyone know, if this is normal, that I hear inside (somewhere at the firewall/pushrod) that "hiss" sound?

I hear it everytime when I touch the brake pedal and push it down, just for the first 2inches until I feel the restistance point. When I feel the restistance and brake force is applied, the noise is gone.
I never lost brake pressure on the pedal and the pedal does also not move down, when I stand at the red light, so i just wonder if the sound is normal, or whether there might be some hidden danger, which could cause the brakes to fail suddenly.

Old May 4th, 2020, 08:30 PM
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glc glc is offline

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You may have a vacuum leak in the brake booster.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS

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