Brake Upgrade Options

[frank]

bear in mind ours are diagonally split systems too chris, so you would need a 2 channel bias valve or else the abs master cylinder.
just did some more testing with all 4 wheels off the ground, and there is still about 3 x the braking force on the front ! ie when i load the pedal enough to lock the fronts solid, the rears are still turnable (just)
i think part of the problem is that our cars get new discs and pads every few years (which brings them up to full factory spec) but the rears tend to only get shoes and cylinders, so you would need new drums and self adjust mech to bring the rears back up to spec
here,s the valve delete pipes fitted

 

[SirChris]

Apparently frank you can use the non abs one frank somehow. Matt was explaining to me that you can use particular ports. Possibly blocking non used ones?

 

[SirChris]

I shall find out soon enough

 

[Low Rider]

I know I may bang on about it, but corner weighting can help decide your ratio.

I know my car is exactly 62%F 38%R
So for a 50/50 brake balance ratio I need a 62/38 as a braking ratio
It gets a little more complicated than that of course but its good starting point

FYI, ad22vf front and stock rear calipers gives 70/30 static bias.

 

[SirChris]

FYI, ad22vf front and stock rear calipers gives 70/30 static bias.

Pulsars w 257 disks? I have to admit I am unaware of the meaning or differences of the last characters after ad22

 

[frank]

FYI, ad22vf front and stock rear calipers gives 70/30 static bias.

so with the stock apportioning valve spring-bound/cable-tied its probably running about 85/15 dynamic bias, and with drumbrake rears and/or unbound worse still !

 

[SirChris]

Jesus

 

[frank]

here,s the stock bias valve, the springs hold the pressure back till (for example) 200psi, then let the fluid flow to the rears from 200 onwards, and the plungers increase the pressure on the springs if the car is unloaded (300psi or whatever).
so you could fit lighter springs to reduce the bias i guess.
i think that "crackpoint" of 200psi is to stop the rears locking up on ice etc, but its a pretty crude system that either on or off eh

typical adjustable bais valve

 

[h701micra]

FYI, ad22vf front and stock rear calipers gives 70/30 static bias.

Ta Dave
Wonder how mine actually stands on the bias front

 

[frank]

I know this is a common topic, I have searched but have come up with countless dribble and nonsense. Besides the ad22v upgrade, has anybody managed to use brake calipers from another make? Perhaps Toyota or mitsubishi as i understand corollas and maybe? fto's have the required 130mm caliper bolt spacing. Perhaps toyota Caldinas etc etc anyways, i believe there are a fair few makes with this spacing, the problem most likely being the offset of the rotors.

So has anybody got solid experience or ideas before i start researching. People want ridiculous amounts of money here for 20 year old ad22's and i cant justify that so im looking for alternatives.

Cheers,
George

any luck on the 130mm ctc calipers yet george ? i had a look around our local yards this afternoon and found very little tbh, most of the toyota ones were,nt 130mm, and even then the bolthole was very offset in relation to the disc face (ours are alongside the disc eh)

there was a late colt that looked promising (mivec ?) and an avensis 2.4D

 

[gee-aye-dee]

no nothing. Been working flat chat and alot of our self serve wrecking yards here in aus are full of mid to late 90's cars so not much promise

 

[gee-aye-dee]

I did, however. Find this...

http://www.canadagtir.com/forum/for-sale/gb-brake-upgrade-for-less-you-think

 

[eiregti]

Twin pots off an mitsi fto or space wagon fit N15's as a good 280mm upgrade. Seeing as N15 brakes fit k11 I presume the same setup will bolt on to the K11 also.

I know this is for cheaper upgrades but figured it was worth a mention

Sent from my SM-G900F using Tapatalk

I did, however. Find this...

http://www.canadagtir.com/forum/for-sale/gb-brake-upgrade-for-less-you-think

Already mentioned a similar setup, mitsubishi twin pots from fto or space wagon, few other models also. Renault clio 280mm disks. 3-4mm spacer behind disc to centre it in the caliper or else machine hubs and caliper carriers to suit. Hubs need to be drilled from 10 mm to 12mm to suit the new caliper carrier bolts also

Sent from my SM-G900F using Tapatalk

 

[baguete]

Sent from Micra Heaven

 

[frank]

any luck on the 130mm ctc calipers yet george ? i had a look around our local yards this afternoon and found very little tbh, most of the toyota ones were,nt 130mm, and even then the bolthole was very offset in relation to the disc face (ours are alongside the disc eh)

View attachment 36326

there was a late colt that looked promising (mivec ?) and an avensis 2.4D

found some nice looking lightweight alloy calipers on a prius yesterday same flat face bolt fitting as ours, and 130mm spacing

View attachment 36326

 

[frank]

found some nice looking lightweight alloy calipers on a prius yesterday same flat face bolt fitting as ours, and 130mm spacing

View attachment 36326

these are the prius ones, same design (offset and bolt spacing) but with a 30mm bigger dia vented disc

 

[SirChris]

these are the prius ones, same design (offset and bolt spacing) but with a 30mm bigger dia vented disc

View attachment 39214

but do they fit the bolt pattern?

 

[SirChris]

Also ABS pulsar 93 MasterCylinder and Brake Servo has arrived. I will report. On more immediate subjects, I did the brake bias delete @frank, the bias is alot happier.

 

[frank]

but do they fit the bolt pattern?

yes same bolts chris, 130mm apart (centre to centre), so you would need discs with the same face-to-face offset but about 30mm bigger dia than stock

 

[SirChris]

Also ABS pulsar 93 MasterCylinder and Brake Servo has arrived. I will report. On more immediate subjects, I did the brake bias delete @frank, the bias is alot happier.

Will be re laying all brake systems @frank **edit I guessed that getting the steel lines to flare would be a nightmare? any experience?

 

[SirChris]

yes same bolts chris, 130mm apart (centre to centre), so you would need discs with the same face-to-face offset but about 30mm bigger dia than stock

hmm seems like a good upgrade. They lightweight? I couldnt think of what disks you could get, or how the hell you could search.

 

[frank]

hmm seems like a good upgrade. They lightweight? I couldnt think of what disks you could get, or how the hell you could search.

the caliper is alloy chris (tho that bracket is cast iron the same as stock) so they,re a lot lighter than sr20/gti ones
and sr20/gti discs i guess ? i forgot to measure the piston tho

 

[skymera]

? i forgot to measure the piston tho

God Frank, you're such a let down!

 

[SirChris]

the caliper is alloy chris (tho that bracket is cast iron the same as stock) so they,re a lot lighter than sr20/gti ones
and sr20/gti discs i guess ? i forgot to measure the piston tho

+1 skymera ... let down

hmm, i do wonder, what year frank? may have to go have a look. see edited top post regarding relaying pipes n stuff soz.

 

[frank]

+1 skymera ... let down

hmm, i do wonder, what year frank? may have to go have a look. see edited top post regarding relaying pipes n stuff soz.

there were no plates on the car chris i,m afraid, and steel pipe will flare ok (why not copper ?)

 

[SirChris]

there were no plates on the car chris i,m afraid, and steel pipe will flare ok (why not copper ?)

using existing pipe work frank n extending it to save length. I though the steel lines would be a ****ter to flare so intended on just doing away and starting a fresh with copper to every corner through the inside of the car.