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Discussion Starter · #1 ·
Ok I have a 2014 Kia optima EX I am in the middle our process of swapping the canbus out that I bought on the K5 optima store online for some reason my brakes they work somewhat after I have to step extremely hard on the brakes for it to finally kick in it doesn’t feel like it’s got any leeway or I don’t know how to word it but it I press extremely hard on them n the pedal barely budgets help!
 

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Discussion Starter · #3 ·
My car is running fine just when I push on the brakes it's super hard to get them to work
 

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2011 Kia Optima
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Not considering engine performance, but some have complained that with the engine off, the pedal can't be moved, so just checking.
A hard pedal when engine running, check that the booster is receiving vacuum.
 
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