Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

16" wheels

17" wheels

18" wheels

[cem_devecioglu]

The ABS will manage the absolute stopping power, regardless of tyres, as its sole function is to prevent wheel lock

under certain conditions abs stops the car longer
 
a chain is as strong as its weakest part.. see Kevins post..

here are some notes on abs
 
"More specifically, the studies show that ABS has no real-world effect on dry-surface braking, ABS-equipped vehicles take longer to stop on ice than non-ABS vehicles, ABS-equipped vehicles are more prone to roll-over accidents than non-ABS vehicles, ABS-equipped vehicles are involved more often in single car fatal accidents than non-ABS vehicles, and drivers of ABS-equipped vehicles tend to drive faster and apply their brakes later than non-ABS drivers.
 
The AAA Foundation for Traffic safety has determined that improper driver steering in an ABS-equipped vehicle can send it veering out of control. In their tests, jerking the wheel (as if trying to steer around an obstacle) in a 35 mph panic stop sent ABS-equipped cars careening across two lane widths. (Without the ABS, the car skidded in a straight line.) This behavior may account for the higher roll-over rates for ABS-equipped vehicles. Other research revealed that many drivers don’t use ABS properly; they pump the pedal as they would regular brakes"

[05omegav6]

The ABS will manage the absolute stopping power, regardless of tyres, as its sole function is to prevent wheel lock

under certain conditions abs stops the car longer
 
a chain is as strong as its weakest part.. see Kevins post..

That's what ABS does, even says so in the handbook snow and gravel being two obvious examples... The most effective braking happens just before the wheels lock, ABS simply tries to maintain that point by releasing the brakes as they lock up, which has the effect of extending braking distances....

Anyway I digress

Regarding the master cylinder what are the specific details of the master cylinder on an Omega?

Are they the same across the range?

[Kevin Wood]

Larger caliper piston or smaller MC piston means greater force at the pad for a given force at the pedal but longer pedal travel.

Smaller caliper piston or larger MC piston means less force at the pad for a given force at the pedal but shorter pedal travel.

So.. If you fit larger caliper pistons (as is the more likely scenario), the brakes are going to be more sensitive (less pedal pressure for given braking effort) but the pedal will have a longer travel.

If there's too much pedal travel you might not have enough reserve travel to operate the brakes if one of the circuits fails or the fluid overheats.

We really need some numbers from calipers under consideration to understand what might happen IMHO. Would also be worth researching what alternative MCs might be available.

[cem_devecioglu]

The ABS will manage the absolute stopping power, regardless of tyres, as its sole function is to prevent wheel lock

under certain conditions abs stops the car longer
 
a chain is as strong as its weakest part.. see Kevins post..

That's what ABS does, even says so in the handbook snow and gravel being two obvious examples... The most effective braking happens just before the wheels lock, ABS simply tries to maintain that point by releasing the brakes as they lock up, which has the effect of extending braking distances....

Anyway I digress

Regarding the master cylinder what are the specific details of the master cylinder on an Omega?

Are they the same across the range?

thanks for explaining how abs works  
 
"ABS doesn't work as well on loose surfaces like gravel and sand. If you get into a panic stop situation in loose snow, gravel, or sand, don't expect your ABS to stop you in time, and do your best to steer around any objects in your path." 

and dont believe everything what handbook says

[05omegav6]

Pm sent.

[05omegav6]

With regards the MC...

The Omega ones are given as being...

Pre '98 v6 25.4/20.64 mm (3 channel abs?)
Post '98 all 25.4 mm (4 channel abs?)
Facelift?

Chris has the Commodore manual, which should have the relevant dimensions listed...

The base Monaro is fitted with fr 296x24 and rr 286x8 discs.
The Monaro VXR has fr 330x32 and rr 315x18 discs. I have seen no mention of changing the MC when retrofitting the VXR brakes to the base cars

Will be able to give piston sizes for the VXR brakes tomorrow

[aaronjb]

For reference later, then:

Stock Omega front piston is 57mm
Stock Omega rear piston is 40mm

(from the Brakes Int parts catalogue)

[05omegav6]

For reference later, then:

Stock Omega front piston is 57mm
Stock Omega rear piston is 40mm

(from the Brakes Int parts catalogue)

I made that mistake too...

3.2 has 42mm rear pistons

[Kevin Wood]

For reference later, then:

Stock Omega front piston is 57mm
Stock Omega rear piston is 40mm

(from the Brakes Int parts catalogue)

I made that mistake too...

3.2 has 42mm rear pistons

Yep, noticed at the weekend that my rears are 42. That probably changed when the MC sized were updated but it would be interesting to known the size of the late non-vented rear setup just in case it came in with vented rears.

Has anyone ever got an IR thermometer, heated up a set of Omega brakes and compared front and rear temperatures, out of interest?

[cem_devecioglu]

Pm sent.

pm replied

[05omegav6]

Have just spoken briefly to Monkfish...

The full monty AP set up consists of fr 362x32, 6 pot caliperrs and rr343x26, 4 pot calipers.

Replacing the original CV8 brakes with the full AP set up above produces a marginally longer pedal travel, with the DBA VXR set up being somewhere in between. They have never changed an MC as part of the process, with no reported issues. The ABS side of things remains unaffected as well.

However, they were unable to give the MC diameter... so over to you Chris for that

[serek]

I know few people inc me, who upgrades omega brakes with bigger calipers and discs and dont have any issue with MC

[chrisgixer]

Have just spoken briefly to Monkfish...

The full monty AP set up consists of fr 362x32, 6 pot caliperrs and rr343x26, 4 pot calipers.

Replacing the original CV8 brakes with the full AP set up above produces a marginally longer pedal travel, with the DBA VXR set up being somewhere in between. They have never changed an MC as part of the process, with no reported issues. The ABS side of things remains unaffected as well.

However, they were unable to give the MC diameter... so over to you Chris for that

Internal size? I might have on of those knocking about.

[05omegav6]

It will be in the Specs somewhere in the Haynes Commodore manual looking for VZ 5.7/6.0...

If you also happened to have a 3.2 Omega one knocking about for measuring purposes, that would be nice

[chrisgixer]

Poll added.