Am I being stupid?

DRZ · 1 Aug 2006 at 01:46

bigG said:
dont confuse ABS with ESP

I am not... :rolleyes:

ABS is cadence braking, which allows you to steer the car around an object while maintaining maximum available traction.

If you only ever needed to brake in a straight line the calipers would be held in a position of just-before-locking but thats not much good if you need to steer for a few reasons.

Need I be any more clear?

Sadgeek · 1 Aug 2006 at 09:06

Jonnycoupe said:
As a side note, ive modded my brakes, changed the tyre size and the type, Im under no illusion that ABS will brake better than me. Unlike my ABS I can learn to reduce braking distance right down to the maximum the ABS system is only calibrated for the std setup, however in an emergency when you just react its a totally different storey

Changing your setup isn't going to stop the ABS from working to an optimum. It's not like the system has a map to check figures from then applies the brakes to a specific ratio. It checks the rotational speed of each wheel and compares against the others to see that they are all rotating to a similar rate.

<Dubz> · 1 Aug 2006 at 09:09

i've only ever really felt it in the snow on my 106 Gti, but thats probably cos the brakes are so crpa on these thats it's quite hard to lock them to get the ABS to kick in.

I tested it the other day as my ABS light has been on for ages, managed to get it to lock and confirm non working ABS, new sensor fitted to rear and now it works again but it's not like i noticed that it wasnt working for 2 months.

...that reminds me, MoT due in two weeks...

also saying that it even locked up in the dry is a bit silly, ABS is meant to stop you locking the wheels solid in any condition not just when it's wet.

Simon · 1 Aug 2006 at 09:09

Sadgeek said:
Changing your setup isn't going to stop the ABS from working to an optimum. It's not like the system has a map to check figures from then applies the brakes to a specific ratio. It checks the rotational speed of each wheel and compares against the others to see that they are all rotating to a similar rate.

The pressure modulation will be screwed up though. The brakes are different to what it expects and so are the tyres in most cases, this means less that optimum operation.

The wheel speeds are just a reading to the ABS module, the module does a lot more than just measure wheel speeds

bigG · 1 Aug 2006 at 21:26

DRZ said:
I am not...

ABS is cadence braking, which allows you to steer the car around an object while maintaining maximum available traction.

If you only ever needed to brake in a straight line the calipers would be held in a position of just-before-locking but thats not much good if you need to steer for a few reasons.

Need I be any more clear?

I will get my coat!

sorry i was wrong

http://www.nsc.org/library/facts/abs.htm

as shown

he he he

Jonnycoupe · 1 Aug 2006 at 23:03

Sadgeek said:
Changing your setup isn't going to stop the ABS from working to an optimum. It's not like the system has a map to check figures from then applies the brakes to a specific ratio. It checks the rotational speed of each wheel and compares against the others to see that they are all rotating to a similar rate.

It will, i wont go into coefficients of friction of tyres and pads and torque forces and how that effects the pre programed brake ABS modulation when it reapllied brake line pressure. Ive done that in another thread before. Need less to say its far from optimised.