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sqtbird89
    
What causes my 1989 Thunderbird Super Coupe engine to rev up when applying the brakes?
When I slow down to make a turn or just to stop in my driveway the engine will rev up when applying the brakes. It does not happen all of the time. It gives you a rush because you have to apply the brakes much harder to keep the car under control.
posted: May 26, 2016
 
     
 
  Answers (3)
 
srfn872
    
it sounds like there is a vacuum leak in the power brake booster that's why you have to press harder to stop. not enough vacuum. hope this helps
posted:  May 26, 2016
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srfn872
    
check the vacuum hose to the booster for cracks or leaks also
posted:  May 26, 2016
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sabergatomon
    
Check the one-way check valve on the booster, as well as the hoses and booster.
posted:  September 4, 2016
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