Question about Toyota Cars & Trucks
O-ring is behind lower connector for Electrical Wiring harness attached to front of booster. O-ring is popping out from base of connector allowing vacuum leak.
Consult the service dealer for details or get an "exploded view"from the parts store and it may show the process for you..
Posted on Jan 21, 2013
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Posted on Jan 02, 2017
There is no repairing the booster you have to buy a rebuilt booster unless you can cut weld and crimp in the diagram, but before you replace it try replacing the check valve that the hose connects to going into the booster. That is available for about ten bucks.
Posted on Aug 31, 2009
Do you by any chance hear a hissing noise from under the dash? If so, yes, you have a bad booster. For it to do what you're saying, it would almost have to have a vacuum leak. However, if there is a problem with something in the ABS system, you should have an ABS warning light on. Also, ABS can make the pedal fade, but I've never heard of it making the pedal hard. Your diagnosis of a brake booster does sound likely, but I'll admit I can't be sure -- this is an odd one.
Posted on Mar 10, 2010
Testimonial: "thanks, heard a hissing that i thought was coming from under the truck -- have to check tomorrow - actually my father's truck. have to get back there"
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