93 replies to this topic

[dattoman]

rory is old and drives like an old man with a cap on
Hence he doesn't need good brakes

Take a drive in a well set up car and you will eat every word said about inferior brakes...I guarantee it
Brakes make you faster... makes the straights longer... so you can use the power longer... simple

Yes you have stock Commy rear brakes
So put the DBA 020 vented version on
Goes straight onto what you have now with no handbrake changes
They have a 160mm handbrake... the VT on run a 190mm... so changes would need to be made to use them

However you'll struggle to fit an AP caliper onto the back with that diameter... 280mm
They need 315mm or so to clear everything due to the bracket design

So... back to Nissan caliper we go... you could put a 2 pot R32 or #3 rear caliper onto that disc... I think
I've not finished the hilux we're playing with to know its definatly going to fit... but its worth a look

[dattoman]

5570 is a direct replacement for the 5200
See the pics above for them.... on a 330mm disc

Don't go too big or you won't get enough heat in them to work

Those Z calipers are same as R32
A few mm difference in disc thickness won't matter to a caliper that has the pads held in by pins as the pad can't flick out like a collette style
They will do the trick... but having said that I haven't tried them yet
We did put some series 4 RX7 4 pot fronts on the 020 once though

[dattoman]

VT upgrade ran a 2 pot caliper with almost indentical pad to stock VT
Harrops ran larger... same size as a Porsche 928 S4
So still alot smaller than the 6 pot AP
Big is not always best
Infact you want to run the smallest brakes you can get away with
Then you have less unsprung and rotating mass to contend with

Temp in disc is required... too hot... excessive wear + fade
Too cold... excessive wear and poor performance

The CP5200 would be adequate for 99% of the population
Check out ozyozyozy.... he runs them... regularly... competatively... and with no issues

Pad choice counts
I like Ferodo DS2500 or Pagid RS42 (blue)
Depends how fast you are

Welby was running RS14 in his.... but till he got fast (Sunday).... they were abit wishy washy
Once he started heating them up and beating up on them were excellent

Previous Targas were all wet till Sunday... so he couldn't drive hard
This year was an all dry event.... hence his top 3 placing (an unofficial win on countback ... hehe)
But this year he grabbed some EBC yellowstuff at the last minute
Not my choice of pad... but they worked

[ozyozyozy]

dont care what others say the ap calipers with 330 rotors, was the best money i spent, and i think its the 1 thing i have not changed on my car since i built it. i will say, they are probable over the top for a street car. great for regular racing.

i use an old style ap 4 piston caliper on the vn vented disc on the rear, with an adjustable brake bias on the rear hydraulic circuit.

as for brake pads i have been using the ferodo ds2500 front and rear. they were spot on for targa south west. the pagids would be better i think for the track as the ferodo`s, i found can over heat. when i go to the track or do events with very hard breaking i fit brake ducts.

with the 330 rotor and ferodo`s they do require some heat to get them to work, a couple of hard stops do the job.

[dattoman]

FRP216H is the front pad
The rear is FCP1372H

The H denotes the compound (DS2500)

All the 2 pot rears are alloy
Buy calipers that are complete and have pads still in them
Then you get all the pins,shims,etc included

[dattoman]

AP's and Nissan are 10x1 threads

Banksias tend to be crap.... depending on the diff and the brakes your planning to use will depend on the diff info

[dattoman]

What master cylinder you using ?

Any of the reputable bias valves should do
They max out at 57% usually...... but your bias might be fairly close to start off with

Or fit a pedalbox/balace bar and run 2 masters

[ozyozyozy]

im using a simple wilwood screw bias adjuster, works fine for me.
by using a larger diameter disc, it changes the leverage point at were the brake caliper reacts, this can help reduce brake lock ups.
if i had my way again i would fit a balance bar on brake pedal and fit 2 master cylinders. this is good for going racing with, not always the best for street tho.

[ls2lxhatch]

There are proportioning valves that can be adjusted during a race. I have seen this style mounted in the dash of a few race cars.



It is not legal to have brake bias that can be manually adjusted whilst driving in a street car. On a street car you would just set it so that the rear brakes do not lockup. I suspect your remote boosters will make fine tuning brake balance rather difficult. It would be worth considering removing the check valve from the boosters and placing a single check valve before the vacuum is split to the boosters. That way the vacuum will always be equal in the boosters.

The main operational difference between a pedal box and a proportioning valve is that the brake bias is consistent at all pressures. Another advantage of the pedal box is the ease with which the size of the front and rear master cylinders can be changed.

Edited by ls2lxhatch, 06 November 2010 - 01:51 PM.

[dattoman]

Your system is comfusing and has been done because of the V8 fitment and no room in the bay
That master is off an XA-B
Thats why the outlets are on the opposite side to normal Holden masters

If you fitted a balance bar and twin cyls you could happily delete those boosters out of the system too

The Falcom master is difficult to adjust and get the preload set correctly... its also not really suited to disc rear
The bottom piston barely moved when at full stroke.... might be OK for a Commodore piston size but .... I don't like them... might work with the nissan caliper ok

Its 1" .... as almost all Holdens and Fords were

With opposing piston calipers you actually require less pressure and volume to make them work... they are just better more efficient calipers
So no you won't need to go bigger

Infact with a balance bar and twin vyls you would go down to 5/8" front and 3/4" rear
More pressure = more stop


Fitting an adjustable valve with your system would require it to be fitted after the booster unit between it and the rear wheels

[dattoman]

Technically they should be legal for rego
Its still a tandem circuit cylinder
And some late model (90's) Jags had no booster and pedal boxes

Measure your pedal ratio now... get something close
I think around 6.25 is normal