1989 XJ Power Brake Assist Noise
#1
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Year: 1989
Model: Cherokee
Engine: 4.0
1989 XJ Power Brake Assist Noise
I have researched this and haven't found any real solutions. While driving from a cold start after about 3-5 minutes my jeep starts making a high pitch whistle. The noise has been getting worse. It appears to be coming from my power brake booster. When I press on the brake pedal it completely goes away. When I put my foot on the brake from a cold start and start the jeep the pedal does move down. Is this something I can fix or should I replace the power brake assist unit?
Erik
1989 XJ
Erik
1989 XJ
#2
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Location: florida
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Year: 1991 Classic
Model: Cherokee
Engine: 4.0 lit I6
Sorry buddy I cant give you much info other than to research Bendix 9 ABS system and you"ll see the biggest problem. Hope the guys who know more troubleshooting can help you. I share your pain.
#3
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
sounds like booster going south to me time to upgrade...http://www.jpmagazine.com/techarticl...des/index.html
#5
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Before you run out and buy a new brake booster. Check out the check valve that is on the booster that goes to the intake manifold to see if it is cracked or even disconnected. Also check the hose that goes to it.
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