Steering wheel shakes when braking from high speed
Discussion
300bhp/ton said:
Lots of potentials here.
Tyres or wheel balance.
Sticking piston/calliper.
Warped discs, although some people claim there is no such thing and that it is uneven carbon build up, rather than warping. Some also say discs need to be honed.
Dodgy ABS kicking in.
Worn suspension part.
As for the lack of braking, is this really the case, or is it just the sensation of lack of braking? If it shakes a lot, then physiologically it can mean you then let off the pedal slightly.
I thought if the wheels were off balance, I'd get vibration without braking at certain speeds? As it is, the car is smooth at all times, until you brake, and only then at speed.Tyres or wheel balance.
Sticking piston/calliper.
Warped discs, although some people claim there is no such thing and that it is uneven carbon build up, rather than warping. Some also say discs need to be honed.
Dodgy ABS kicking in.
Worn suspension part.
As for the lack of braking, is this really the case, or is it just the sensation of lack of braking? If it shakes a lot, then physiologically it can mean you then let off the pedal slightly.
Not sure about the ABS kicking in, it doesn't really feel like that.
I guess it's one of those things that could be difficult to track down though?
The brakes are crap anyway, and I was thinking of upgrading the discs and calipers to larger ones, Pumas are famous for crap brakes. The other problem I have with it is lack of bite (weak servo, apparently).
Big Rod said:
Start with the cheap/easy options first.
Have your wheels balanced by a reputable provider. (Pet hate of mine this. there's only one or two places I trust to do the job properly and one of them balances down to 1g weights.) And while they're at it, get them to make sure the wheel runs true. (You could have a Road Force balance done but that can be £15 per wheel!)
Check your suspension/steering components for play and particularly the lower wishbone bushes/balljoints. (Had an Omega that did this and that's what it turned out to be.)
Check your disks for 'blueing'. Even with the best of intentions I've occassionally left my foot on the brake after heavy decelration and that can cause issues with the surface of the disc.
If it's only under braking then it's not likely to be any driveline components causing it otherwise you'd feel it when not braking.
That point in bold is interesting, since I am sure there is an advisory for a front ball joint in the last MOT Have your wheels balanced by a reputable provider. (Pet hate of mine this. there's only one or two places I trust to do the job properly and one of them balances down to 1g weights.) And while they're at it, get them to make sure the wheel runs true. (You could have a Road Force balance done but that can be £15 per wheel!)
Check your suspension/steering components for play and particularly the lower wishbone bushes/balljoints. (Had an Omega that did this and that's what it turned out to be.)
Check your disks for 'blueing'. Even with the best of intentions I've occassionally left my foot on the brake after heavy decelration and that can cause issues with the surface of the disc.
If it's only under braking then it's not likely to be any driveline components causing it otherwise you'd feel it when not braking.
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