Hi, does anyone has the same problem that when brake hard, the rpm goes higher instantly. Or is this expected?... Thank you!

 

yes, it is normal. The car senses hard braking and helps with engine braking. More pronounce in Sport mode (I should know, I drive always in Sport mode)

 

It's normal...happens most of the time when hard braking in s or s+, once in a while in normal.

 

Yes, it happens in a couple of different scenarios:

1. If you're going downhill and tap the brakes or abruptly release the throttle. This function is intended to engine-brake the car.
2. If you're in Sport or Sport+ and press the brakes firmly. This function is intended to get you in the right gear to accelerate again after braking.

This stuff is also covered in the owner's manual.

 

Yeah braking may be a side effect, but the engine is not revving up to "provide braking."

The engine is revving simply cause the car is downshifting so the engine doesn't stall. It needs to be in the correct gear. Normal for *any car* with an automatic transmission such as 87 Camry, 88 BMW, Ford Taurus, Kia Sorrento, Daihatsu, Ferrari w/ F1 transmission, etc. they all do this.

 

Unfortunately this is simply not what the OP is describing, hence why the authors of the manual felt the need to include a section explaining it. I can make a video if you need clarification.

When going down hill, if I tap the brakes, the car will downshift once or twice. I say "tap" because I mean literally pressing the brake for a split second. When decelerating on a level surface, this behavior does not happen. The only other time this happens is in Sport mode when braking hard.

 

I don't know what you are saying. I'm aware of transmission shift logic. I've owned 18 enthusiast cars, three of those M3s. Have extensive canyon and track experience and have rebuilt three of those cars from the ground up. I don't really need any explanations from you how things work, TBH.

I'm just simply telling the OP transmissions downshifting during braking is normal. As all automatic transmissions do this. Yes there's added layers of shift logic with recent "sportier" cars that hold gears, sense cornering forces, rate of accel, decel, pedal lift, yaw, etc. But the tl;dr is that it's normal for cars to rev when you brake hard (as a normal function of a gear change) and nothing to worry about.

Ford Taurus
Kia Everything
Chevy Colorado
Honda Accord
Lexus ES350
Ford Aerostar
Chevy Malibu
Ferrari 360 F1

lol people do this on other forums too in replies. they think (many times) their choice of car/car brand has special engineering talents their car does thats unique. it's guys wanting to flex their muscles and bolster their personal financial decisions with mansplains.

i'm like nope. that's normal stuff dude. "Cars have been doing that since the 60s" is my usual response.

industry standard.

 

You gave examples of cars like an older Ford Taurus or Toyota Camry, neither of which have the type of shift logic we have in the IS. I'm sure the OP has driven other cars and NOT experienced what they are describing here - otherwise, why make a thread about it? You are overthinking it.

Also, there's no need for an appeal to authority, as you've made it clear in the past that you have experience.

 

This has been helpful to know others experience this. I too have ahead MANY manual cars and many many Lexus cars. I’ve never experienced the downshifting to this degree though. The downhill thing is indeed where this usually occurs for me, but it seems like this car - my is250 - just wants to linger in the lower gear. I shift to neutral and back to drive to make it engage at a gear that isn’t at 5000rpm.

 

It is perfectly normal for the transmission to shift that way when you brake hard. Usually when you do the car is either helping engine brake or it is getting prepped for you to accelerate again depending on the circumstance and what drive mode you’re in so that’s why it revs so high when you brake sometimes.E46CT is just outdated and swears he knows it all but he doesn’t.

 

Your last sentence is some of the most factual information I have seen on these forums.

 

I had driven a tiguan for 2 years, I don't remember I had experienced this, nor on the glk i have driven for 4 years. I did notice this on some rental cars, I thought it was because of those rental drivers' wild driving behaviors leading to a not well functional transmission. Glad I had asked here. Thank you so much for explaining it, and point it out in the manual too. I would never imagine some would actually read the manual

 

Hey I was just nerding out when I read the manual, I have no problem admitting that