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Discussion Starter · #1 ·
Driving 395 south descending Sherwin Summit, eastern Sierra California.
It is a long, somewhat steep downgrade.
Had a fair amount of stuff in the car as we were returning from our cabin for the winter but not overloaded.
As the car approached approx. 75 mph, I applied the brakes slightly to slow the car and the entire car started shaking violently so much so I thought we had blown a tire.
Even had that shudder you get with a flat.
Pulled to the side of the road and inspected each tire and wheel. No flats, no loose rims.
Continued trip home but did notice when I purposely applied the brakes hard the vibration returned but not as pronounced.
Car has a little over 7,000 miles on it.
 

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Discussion Starter · #3 ·
Could be warped brake rotor. Or possibly a set of brake pads broken or cracked.
Yes, I'm sure that's the case. Kind of wondered if anyone else had experienced it.
A heads up to others who might be planning a similar trip.
Also those who may be towing in the future. Don't know about other states but in California the trailer weight is either 1500 or 1800 lbs. without trailer brakes. My guess towing a 1500 lb. trailer on that grade w/o trailer brakes would create a similar scenario.
Will be my first trip into the dealer, will see how Hyundai treats their customers. Thanks.
 

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Oh I don't think you said you were telling the trailer, were you towing one? That could be a difference too it could have been the trailer itself move it around while you were breaking. I know it sounds weird but it is possible. I'm planning a trip to Utah next month but no trailer
 

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Discussion Starter · #5 ·
Oh I don't think you said you were telling the trailer, were you towing one? That could be a difference too it could have been the trailer itself move it around while you were breaking. I know it sounds weird but it is possible. I'm planning a trip to Utah next month but no trailer
Sorry if I confused the issue, no I was not towing......just suggesting it could be a problem for someone who might be.
Might be worthwhile to do a test run rather than get stuck somewhere w/o service.
Usually these kinds of problems aren't "once-offs", rotors and pads may be to soft or undersized for a loaded vehicle.
 

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Well when I take my trip to Utah I should only have about 4,000 mi on the vehicle at the time. And I have AAA premium service so they'll come tow my car I think up to 200 miles. Hopefully I'll never need that
 

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Discussion Starter · #7 ·
Guess I never followed up on this post. Took the car to he dealer. They said the rotors were "slightly" warped. Blamed the shaking on the transmission. Said they "reprogrammed" it.
 

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Somebody posted that having cruise engaged on downhills, even the regular cruise, uses brakes to maintain speed, so that could have been the cause of warped rotors. Did you have cruise? Regardless of that answer, do NOT use cruise going downhill on these vehicles. If necessary, use the engine to slow down the vehicle. Or if still too fast, just apply brakes a second or two, then release, and repeat as needed. I typically don't like to see over 4K-rpm while engine braking. Hope this helps.
 

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Discussion Starter · #9 ·
Somebody posted that having cruise engaged on downhills, even the regular cruise, uses brakes to maintain speed, so that could have been the cause of warped rotors. Did you have cruise? Regardless of that answer, do NOT use cruise going downhill on these vehicles. If necessary, use the engine to slow down the vehicle. Or if still too fast, just apply brakes a second or two, then release, and repeat as needed. I typically don't like to see over 4K-rpm while engine braking. Hope this helps.
Do you know what years use the brakes to maintain speed. I cannot seem to find that info. on the web.
 
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