97 Chevy Suburban: 4wd..idling..the brake pedal, the engine..rough
My parents have a 97 Chevy Suburban 4wd. The brakes are hard to push down on and require more pressure to stop the vehicle. Also, while idling and pressing the brake pedal, the engine runs very rough. I'm thinking that it is a vacuum leak of some sort. Could it be? Are there any simple test that I can do to narrow down the problem? Is there a check valve or some other thing that is common for a Suburban that can be replaced simply? Or could it be the master cylinder? Any help would be great. Thanks.
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http://www.justanswer.com/chevy/2ivnt-parents-97-chevy-suburban-4wd-brakes-hard.html
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