I've noticed on different cars that the Brake callipers are positioned in different places on the disc.

Some are at the 9 o clock position and some at 3 o clock, I even noticed that on an MR 2 their positioned at 11 o clock on the rears.

Are there any advantaged from having the callipers different positions

I think that the brake caliper position is usually controlled by where there's most space around the suspension and steering arms as much as anything else. I'll bet that most vehicles that carry the steering arms behind the kingpin (axis) have calipers on the front half of the front disc, and that most vehicles have rear calipers on the rear half of the disc (except ATESSA 4WS cars).

Edited 18 July, 201114 yr by KenONeill

Read an article ages ago about this........there was also some advantage to be had in mounting it lower to the ground for weight distibution.....also I seem to remember that alot of front brakes on front wheel drive cars tend to have the caliper at the front edge of the disc as this has the most force/weight transfer onto it which helps!........most rear wheel drive vehicles tend to have the front caliper at the rear edge of the disc as the weight transfer is different and the caliper is positioned better for weight distribution that affects "bump steer etc".....then you have to take into account all other "packaging" requirments......trying to do this from memory......my head hurts now... :(

Edited 18 July, 201114 yr by fabdavrav

"most rear wheel drive vehicles tend to have the front caliper at the rear edge of the disc as the weight transfer is different and the caliper is positioned better for weight distribution that affects "bump steer etc"....."

I think either your memory is wrong, or the article was ballcocks. Bump steer is caused by the relationship between the steering arms and suspension links being such that the vertical movement of the stub axle causes more or less lock to be applied than would be required to retain the commanded turn radius.

I think either your memory is wrong, or the article was ballcocks. Bump steer is caused by the relationship between the steering arms and suspension links being such that the vertical movement of the stub axle causes more or less lock to be applied than would be required to retain the commanded turn radius.

As I said...I'm trying to do it from memmory!!......Bump steer wrong term then ..........It was to do with the weight of the caliper in relation to the steering track rod........eg if the caliper was on the front edge of the disc or on the rear edge of the disc and the way the track rod and arm is positioned on the hub carrier as it is all unsprung weight..and tyring to "balance it" all......so it affects how the steering and suspension acts.

Or if it is an early MX5 I think they placed them towards the centre of the car for better weight distribution and reduced lateral turn in inertia when cornering... :yes:

reduced lateral turn in inertia when cornering... :yes:

+1

Thats also what I was trying to say!!!.....brains still abit fuzzzzzzy!!

Or if it is an early MX5 I think they placed them towards the centre of the car for better weight distribution and reduced lateral turn in inertia when cornering... :yes:

And the RX-8. Front calipers are at the rear of the disk, and the rear ones are at the front (so both point towards each other).

Or if it is an early MX5 I think they placed them towards the centre of the car for reduced lateral turn in inertia when cornering... :yes:

Just how fast do you turn the steering wheel!?

Or did you mean a reduced polar moment of inertia by moving the calipers closer to the centre of gravity?

Or did you mean a reduced polar moment of inertia by moving the calipers closer to the centre of gravity?

That's the baby Ken!

And the RX-8. Front calipers are at the rear of the disk, and the rear ones are at the front (so both point towards each other).

Yep - and I think that's because the 1st Gen RX8 was developed from the MX5 chassis so has a lot of the same elements (albeit changed to suit)- such as the Powerplant Frame etc.

Anyway - back on topic...

Edited 18 July, 201114 yr by skomaz