97 Chevy Suburban: 4wd..idling..the brake pedal, the engine..rough

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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Vehicle Stalls At Idle

Jeep Wrangler, Stalling Problems Troubleshooting

Q: Its a Jeep Wrangler 4.0L with an automatic transmission.

The Problem Noticed is :------ At cold start up it revs to fast idle then as it comes down to regular idle it stalls out. Restarting it may or may not stall again. When it reaches operating temperature, it runs fine.

Parts Replaced :----  The plugs, ignition wires, rotor and distributor cap were replaced at 2k-2.5k miles before stalling started and they still look good. Fuel pump pressure is normal. This vehicle has 143k mile on it and has given excellent service.

A: Take the air inlet hose off where it enters the throttle body and take a look at the throttle plates. It is likely that they’re dirty and have a build-up of carbon deposits. That is the most common cause for stalling that we see in the shop for your vehicle. Sometimes all it takes is a good cleaning to cure the stalling problem. There is an idle speed setting on your Jeep, but to check and/or perform this service step requires the use of a computer scan tool for your vehicle. If the cleaning doesn’t help ask a repair facility to check and reset, if needed, the minimum idle speed on your Jeep.