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The vacuum brake booster is connected to the engine through a large vacuum hose directly to the intake manifold. The power brake assist is dependent on the engine vacuum to operate, and allows air into the intake manifold whenever you press on the brakes.
A certain amount of increase in engine idle speed is natural when you press the brakes, however, if there is too much idle increase, you may want to have the vacuum booster tested for leaks. The power brake system can still work while there are relatively small leaks in the booster, but if there are leaks now, they will only get worse and can potentially cause problems with the power brake system.
That may not be your problem, but it would be a good idea to have it checked.
What else can I help you with?
What causes low idle in the engine on a 2002 kia sportage?
low idle and uneven idle
What causes amp meter to fluxuate when turn signal in on?
is this happening when car is at idle? the indicators use power so sometimes at idle the amp meter will fluctuate because of this. if this is happening when driving i would have alternator and battery checked
What causes a car to idle rough and sometimes shut off when coming to a stop?
It could be your TPS, throttle positioning sensor. At least, that was the case with my 89 prelude.
What causes 1999 suburu legacy to knock-click during idle?
Sometimes the Timing belt tensioner will cause a tap or click until the engine is warm.
What causes a car to idle good and run rough when you give it gas?
What causes a car to idle good and run rough when you give it gas?
What causes high idle and then rough high idle when heater is turned on?
Vacuum leek
What causes a 1994 Astro to stall on low revs and on idle speed when it runs fine on freeways and higher revs?
Possibly a stuck or sticking EGR valve.
What causes my Mx3 idle speed to drop to 500rpm?
On most vehicles there is a screw located on the throttle body, it is the idle control. Sometimes it is cover and sometimes not but most times it is recessed. Tightening the screw will cause the idle to drop as it is cutting off the airflow through a secondary passage in the throttle body, loosening the screw will raise the idle allowing for more air to pass. Sometime in warmer or colder weather the airs density can be too high or low for the vehicle to idle properly and this screw must be altered.
What causes a truck to idle high when started?
the choke is on
What causes higher than normal idle until warmup on 1997 Chevy PU?
A vacuum leak could do that. If the check engine light is or has been on, have the vehicle scanned for codes.
What causes car to vibrate when ac is running but only when in idle?
Fast idle motor is not working. This is allowing the idle to fall below the threshold of what it should be when the A/C is on.
Will Mechanical idle stops always be set to a higher speed than the engine idle speed?
Yes
