Vibrating / pulsating in steering wheel while braking?
Discussion
Hi all. just back from a trip on the motorway and felt a vibration in the steering wheel when braking from speed.
It's not the time of day to start inspecting things, so any ideas as to culprits are welcome!
Front discs and pads haven't been changed for two years. That said, there's plenty of meat left on them - I'm quite a light braker.
Front bushes do need replacing.
It's not the time of day to start inspecting things, so any ideas as to culprits are welcome!
Front discs and pads haven't been changed for two years. That said, there's plenty of meat left on them - I'm quite a light braker.
Front bushes do need replacing.
Was it a regular "BRRRRRRRRRRRRRRRRRRRRR" kinda thing? Or more a rapid WobbleWobbleWobbleWobbleWobble?
The former sounds more like your ABS was cutting in, but is usually felt through the brake pedal most. Knackered bushes would certainly cause the rapid wobbling, like the steering is trying to get away from you. Get it to a local trusted garage and get them to have a look.
Is this the Ibiza Cupra Sport?
The former sounds more like your ABS was cutting in, but is usually felt through the brake pedal most. Knackered bushes would certainly cause the rapid wobbling, like the steering is trying to get away from you. Get it to a local trusted garage and get them to have a look.
Is this the Ibiza Cupra Sport?
AlpineWhite said:
Might try a new set of discs then. Arse! One other bit of info - it seemed to get stronger through the drive. There was the odd bit of dual carriageway before / after.
Edit. Toaster Pilot - what was wrong with the caliper?
They said it was sticking however they were a complete bunch of cowboys so I wouldn't take everything they said at face value.Edit. Toaster Pilot - what was wrong with the caliper?
Edited by AlpineWhite on Sunday 4th December 06:49
Unlikely to be warped discs - an often used, but normally incorrect phrase as it only really occurs on track due to constant heavy braking
More likely is disc thickness variation, which accounts for both judder through the steering wheel and the pulsation of the pedal
DTV occurs, as mass produced parts that rotate a very rarely true. As the disc rotates, any rotational runout (there will be a small amount) causes the inner and outer faces of the disc to contact the pad once per revolution - over time, this causes thickness variation of the disc
Getting the discs skimmed on the car will not only get rid of the thickness variation, but will also compensate for runout, which should prevent it reoccurring rom happening again in the future.
More likely is disc thickness variation, which accounts for both judder through the steering wheel and the pulsation of the pedal
DTV occurs, as mass produced parts that rotate a very rarely true. As the disc rotates, any rotational runout (there will be a small amount) causes the inner and outer faces of the disc to contact the pad once per revolution - over time, this causes thickness variation of the disc
Getting the discs skimmed on the car will not only get rid of the thickness variation, but will also compensate for runout, which should prevent it reoccurring rom happening again in the future.
toaster pilot - Ah, fair enough. Cheers.
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I did wonder whether it might be a wheel balance problem... but as I only e experience it under braking, it seems unlikely to my mind.
Will check pressures though, did it the other weekend but the car's done 1500 miles since then!
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Superhoop: is it something that can become apparent relatively quickly? I.e. fine for thousands of miles (I've done 40k on them) but it suddenly becomes noticeable?
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I did wonder whether it might be a wheel balance problem... but as I only e experience it under braking, it seems unlikely to my mind.
Will check pressures though, did it the other weekend but the car's done 1500 miles since then!
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Superhoop: is it something that can become apparent relatively quickly? I.e. fine for thousands of miles (I've done 40k on them) but it suddenly becomes noticeable?
Edited by AlpineWhite on Sunday 4th December 09:07
It's something that normally shows up with heat - the hotter the brakes get, the worse the judder becomes.
I think you said in your OP that you were coming off the motorway with passengers in the car? Braking from high speed with additional weight in the car = higher braking forces than normal = more heat
I think you said in your OP that you were coming off the motorway with passengers in the car? Braking from high speed with additional weight in the car = higher braking forces than normal = more heat
Sounds like warped discs to me. One classic cause of warped discs is slowing from high speed to say, a set of lights I.e. comIng off a motor way up a slip road then sitting at the lights with you foot on the brakes rather than using the hand brake.
Some cars are prone to it. Volvo had warping problems with some of their c70s. Their solution was to fit larger diameter discs.
Some cars are prone to it. Volvo had warping problems with some of their c70s. Their solution was to fit larger diameter discs.
Superhoop said:
Unlikely to be warped discs - an often used, but normally incorrect phrase as it only really occurs on track due to constant heavy braking
More likely is disc thickness variation, which accounts for both judder through the steering wheel and the pulsation of the pedal
DTV occurs, as mass produced parts that rotate a very rarely true. As the disc rotates, any rotational runout (there will be a small amount) causes the inner and outer faces of the disc to contact the pad once per revolution - over time, this causes thickness variation of the disc
Getting the discs skimmed on the car will not only get rid of the thickness variation, but will also compensate for runout, which should prevent it reoccurring rom happening again in the future.
This, EBC advise to have discs skimmed once fitted to eliminate this, it can be caused by hub run out or even a tiny amount of dirt on the face of the hub when the discs are fitted, new discs will be a temporary cure which will return with mileage.More likely is disc thickness variation, which accounts for both judder through the steering wheel and the pulsation of the pedal
DTV occurs, as mass produced parts that rotate a very rarely true. As the disc rotates, any rotational runout (there will be a small amount) causes the inner and outer faces of the disc to contact the pad once per revolution - over time, this causes thickness variation of the disc
Getting the discs skimmed on the car will not only get rid of the thickness variation, but will also compensate for runout, which should prevent it reoccurring rom happening again in the future.
SuperVM said:
It can also be caused by pad residue on the discs.
This is the most likely cause by far - warped discs are one of the great PH myths but are very rare outside of trackday abuse. Very often the residue on the disc will clean up in normal driving. If you go around slamming the brakes on that will only make it worse.Manufacturers go to a lot of effort specifying an appropriate brake pad for their cars. Use of non-standard pads can increase the likelihood of this problem occurring.
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