post #1 of Old 04-03-2010, 01:11 PM Thread Starter
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2015 JK Wrangler 
Join Date: Jun 2009
Location: Olympia
Posts: 1,252
Brake booster itself gone bad, or check valve?

Curious if one is more prone to failure than the other? I know the check valve is only about $6 with grommets so I can try that first. But the past month, every time I go out to start the Jeep, the brakes are ROCK hard. It's like the vacuum reservoir is leaking all of the vacuum out and causing the problem. This also happens about 2 hours after shutting the Jeep off. Doesn't cause drive-ability issues but I want to get this fixed before it gets bad and causes an accident.

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post #2 of Old 04-03-2010, 01:22 PM
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1989 YJ Wrangler 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,687
personally for $6 I would do the check valve and if its not it then you will have a spare when you put in the new booster.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
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