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Discussion Starter #1 (Edited)
2016 Trailhawk here. I had not started my Renegade for about 10 days. When I got into start, pressed on the brake then hit start button, the brake pedal was very hard to push down. I really had to push down to get the brake pedal to move down enough to start the engine. Is this normal, something I need to worry about. Does this happen when the vehicle is not started for 10 plus days.?
 

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It is normal if someone stepped on the brake pedal since the last time the car was run. You don't have much brake boost reserve when the engine is off. I think you only get about one pedal stroke before the boost bleeds off.

And I have noticed that too on occasion. Maybe the boost actually does bleed off if the vehicle is not driven. I'll have to pay attention now that I use the motorcycle much of the time for work and my other car and the Renegade sit for days at a time.

I never liked when they started put the brake pedal interlocks on cars and another reason I always drove manual transmission cars (the modern clutch interlock is at least a bit less intrusive).
 

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This is happening to me all the sudden, but almost every time I start the car. I use it every day. It started out of nowhere about two weeks ago. I'll bring it up at next service. I'm at 30K miles, so soon out of warranty.
 

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Possibly the brake booster check valve, the rubber grommet, or the booster itself. Anything that allows vacuum to leak down while the engine is off. If it is a very small leak it won't matter much.
 

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Mine does that if I don't use it for a few days. The brake booster must bleed off its vacuum over time. This causes me no concern as the brakes work as well as they did when brand new.
 
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