*Urgent, Hole in Firewall Sound - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-02-2013
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*Urgent, Hole in Firewall Sound

I drilled through my firewall to ground a switch for my airhorns and when I start my truck there's a loud air sound like its escaping from somewhere but when I step on the brakes really hard the sound goes away, my brakes still work. What did i screw up?

It's the hole just under the steering and above the ground:
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Old 06-02-2013
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Old 06-02-2013
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Just guessing here - but a hole in the brake booster?

If there is a leak in the diaphragm, I assume it would do that.

The brake booster diaphragm works on vacuum...

EDIT: Yep, those four larger bolts are for the brake booster. I'm guessing your drill went right into it.

Last edited by logan03CO; 06-02-2013 at 04:58 PM.
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Old 06-02-2013
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Quote:
Originally Posted by logan03CO View Post
Just guessing here - but a hole in the brake booster?

If there is a leak in the diaphragm, I assume it would do that.

The brake booster diaphragm works on vacuum...

EDIT: Yep, those four larger bolts are for the brake booster. I'm guessing your drill went right into it.
Yup stupid rushed mistake.

I drove it around the block and the braking was fine but If i slammed all the way down on the brakes my rpms would drop and truck would almost stall
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Old 06-02-2013
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Would it be possible to patch the brake booster?
Maybe JB weld in the hole or weld on a small patch plate?

I'm not too sure about how thick or thin the material is making up the walls of the booster.
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Old 06-03-2013
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It sounds like you might have to replace the brake booster.
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Old 06-03-2013
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id replace it, and double check next time you run a ground and before you drill.
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Old 06-04-2013
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You could have avoided the hole to begin with. I just poked a little hole in the grommet under the engine fuse box and ran wires for my sub, back-up camera, and off road lights through it. Much easier.
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