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YOUR RESEARCHPunishing ride when braking downhill
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suspension setup was setup
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But the main cause was suspension setup was setup for track use and the car floated from ripples during hard braking caused the ABS to kick in and increasing the braking distance.
Leading evidence: 'suspension setup was setup' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'suspension setup was setup' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust (slow down and not' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
Thanks for the explanation and you described exactly how it feels and how I adjust (slow down and not to brake as hard).
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Suggestion
And obviouosly you can't adjust the rebound force with most of our stock shocks.
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suspension setup was setup
No successful repair reported for this finding.
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Reported cause
But the main cause was suspension setup was setup for track use and the car floated from ripples during hard braking caused the ABS to kick in and increasing the braking distance.
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When I go downhill at some speed, then need to brake to stop the car, now if I hit a bump (not speed bump but more like small bump no more than 0.5"), it feels like if I hit a curb with the front wheels! The front shocks feel like bottomed out and ABS is about to kick in. Is that normal? I don't feel the same on any other cars on the same road.
Car has stock suspsion.
Thanks.
Thanks guys. Will keep an eye on it for now. The car brakes well in general, it's just this bumpy road, downhill, heavy braking combo upsets it quite a bit.
You are probably referring to the ripple effect, when the suspension is loaded (in your case down hill braking) it have less travel as it is already compressed and when you hit ripples on the road or in your case small bump the suspension tends to "float" over loosing some contact with the road which causes ABS to kick in as your rear tires are still in contact and doesn’t match the speed of the front wheels. And obviouosly you can't adjust the rebound force with most of our stock shocks.
This is quit common for cars with stiff suspension, most apparent when car is braking at a down slope. My Ferrari does the same thing when I brake hard enough, so once I learn the characters of the road surface I avoid braking hard at those areas next time around.
That's one of the dangers of spirited driving on the street, as you never know how the road surface will change and affect the handling of the car. I personally know of a professional race car driver that crashed his car on the street in situations exactly like this, of course his speed were excessive. But the main cause was suspension setup was setup for track use and the car floated from ripples during hard braking caused the ABS to kick in and increasing the braking distance.
Hi Robin,
Thanks for the explanation and you described exactly how it feels and how I adjust (slow down and not to brake as hard).
Totally agree with your spirited driving on the street comment.
Robin is, of course, dead on. To add a bit of color, you are asking your shocks to deal with two types of compression at the same time. The braking creates low-speed compression while the bumps cause high-speed compression. 4-way race shocks have separate settings for low and high speed compression and rebound but your shocks have predetermined valving that obviously doesn't handle it very well. So, your braking is slowly compressing the shock to the point where the high-speed compression and rebound don't perform correctly. So, rather than deal with the bumps they float over them as Robin described.
Jim
