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Unread 07-10-2013, 05:38 PM   #1
Reno72
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1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North, Ca
Posts: 609
Idle increase when braking

It sounds like I have a vacuum leak where my pedal pushes into the booster. I hear a vacuum inside the cab and my idle speed increases. I have not noticed a change in my braking while moving or sitting, the pedal holds it's place not going lower while pushed in. Does this sound like time for a new booster or can you just change the plunger?

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Unread 07-10-2013, 06:54 PM   #2
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,501
When the jeep is not running and you step on the brake, it holds solidly? Usually a rise in idle speed when pushing the brake is a leak in the booster diaphram . Google is your friend, amigo
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Unread 07-10-2013, 07:36 PM   #3
Reno72
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1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North, Ca
Posts: 609
Actually I did google and did a search here, it seems opinions differ from that's normal, to you need a new booster. I figure it's the booster as I don't remember hearing the vacuum in the cab. Only thing throwing me off is my brakes act normal while driving, sitting at a light, and on a hill. I was hoping to do the bigger brake booster once a switch to the 8.8 and disc's so I can bleed and rebuild the front and back all at once. I guess I'll have to do the booster now.
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Unread 07-10-2013, 08:39 PM   #4
superj
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1987 YJ Wrangler 
 
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Location: corpus christi, texas
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Mine leaks and acts normal. I will fix mine sometime also. Same description as yours
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