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Unread 05-09-2013, 03:30 PM   #1
Soflojeep
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1990 YJ Wrangler 
 
Join Date: Jul 2012
Location: Tequesta, FL
Posts: 19
Brake Hissing

My 1990 YJ started making a hissing noise. When I pressed the brake pedal it stopped. Hasn't effected anything yet...but today it started making a different hissing when I pressed the brake pedal.

Sort of tight hissing when not pressed and then spurting like hissing when pressed.

Dont' know if I'm explaining it well enough but does anyone know what this is.

The pressure on the brakes are fine...it stops without any trouble but I don't want to be surprised.

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Unread 05-09-2013, 03:35 PM   #2
zeus87gn
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1987 YJ Wrangler 
 
Join Date: Sep 2006
Location: Houston, Texas
Posts: 2,395
You will be surprised before much longer
Your brake booster is leaking - time to replace it
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Unread 05-10-2013, 06:35 PM   #3
Soflojeep
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1990 YJ Wrangler 
 
Join Date: Jul 2012
Location: Tequesta, FL
Posts: 19
Is this a complicated job?
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Unread 05-11-2013, 04:09 PM   #4
zeus87gn
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1987 YJ Wrangler 
 
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Location: Houston, Texas
Posts: 2,395
Just the booster no - but it has to be done a certain way
Best to either get experienced help or a manual to learn

Basically, you unbolt the master cylinder from the booster without removing the brake lines
Thenn disconnect the pedal from the rod under the dash
Then unbolt the booster

A manual will have good pictures
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