vented brake conversion bundy

Post by **pozman** » Sat Mar 21, 2009 9:25 pm

hi peoples,

talking to the engineer the other day, and he wants to see vented rotors on the bundy for the 7m-gte convo

has anyone done the "big" brake conversion on one or ave any clues as to what to use?

thanks paul

Post by **-Nemesis-** » Sat Mar 21, 2009 9:27 pm

Vented as in slotted or something?

If so, that sounds a bit stupid. They only really keep the discs cooler. And trap mud between your pads and discs.....

Or vented as in gaps between the two disc surfaces? Stock 4Runner discs are like that, would have thought Bundy would be too...

Typical 'vented' discs

Post by **pozman** » Sun Mar 22, 2009 7:33 am

yeah vent in between the the two disc surfaces, like the photo, bundy has solid rotors, no vents, and 4 pots

Post by **beinthemud** » Sun Mar 22, 2009 4:28 pm

from one bundy owner to another put slotted on it

Post by **beinthemud** » Sun Mar 22, 2009 4:51 pm

pm me ill get u the best price i can from memory was under $100 per rotor

Post by **v8zuki** » Sun Mar 22, 2009 5:09 pm

you have to change the discs and the calipers as the discs are wider
any discs and calipers of a rigid front axle hilux or 60,75ser cruiser will work
the ifs discs and calipers only fit with a spacer kit from snake or superior or any one else who makes them

Post by **beinthemud** » Sun Mar 22, 2009 5:19 pm

thats to fit vented yes but if u go to slotted u dont need to

Post by **pozman** » Sun Mar 22, 2009 5:43 pm

yeah need to go vented, thanks for the help guys

Post by **-Nemesis-** » Sun Mar 22, 2009 9:46 pm

v8zuki wrote: the ifs discs and calipers only fit with a spacer kit from snake or superior or any one else who makes them

That'd be a nice bake uprade with V6 calipers, though costly. And it would give a 3" track increase. Pretty sure you run 60 series rotors (only about $120 a pair - vented) with V6 4Runner calipers.

Just about any Toyota smaller than a Cruiser and you're laughing with V6 4unner caliper and booster/mc set up. My blown V8 4Runner has stock brakes (none slotted or drilled rotors) and on 33's I can still almost do a handstand if I jump on the middle pedal hard enough.

beinthemud wrote:thats to fit vented yes but if u go to slotted u dont need to

Besides the fact his engineer said he needs vented, slotted rotors are a waste of time. They don't increase the braking power and they get full of mud and grime off road, which eat out your pads.

Post by **beinthemud** » Mon Mar 23, 2009 3:39 pm

putting vented wont increase stopping power size will put abigger solid disc would do the same thing.
vented only helps cool, ive put slotted on my shorty , never seen any build up of mud in the slotts id think vented would be worse as for increasing stopping power i guess depends on what someone calls power , slotted decrease the time the pad takes to hit the rotor , so i use less foot pressure to stop faster,
id say larger slotted would be better

Post by **pozman** » Mon Mar 23, 2009 4:48 pm

hey the brakes aren't that bad on her, but with the brake test, lots of stop start in a row, they will heat up too much, and with so much power there will be no time for them to cool down, not an issue with the 22r as it takes 2 hours to get back up to a 100, lol.

but yeah thinking i might go to the v6 runner brakes if i can find a set.

not sure if there will be enough room to fit a bigger diameter rotor in the wheel

Post by **beinthemud** » Mon Mar 23, 2009 5:45 pm

how bout larger slotted,crossdilled,vented rotors

Post by **vk7ybi** » Mon Mar 23, 2009 5:59 pm

While all the hilux/4 runner gurus are here..

I have a 40 series with 4 wheel disc brakes.. One front caliper is stuck and I need to change it out.. Seems the 4 runner upgrade is the way to go.. Ive noticed some 2.8 hiluxes sitting at traffic lights have the same looking calipers as the v6 4 runner, the 2 big pistons and the ribs around the outside.. The question is, are the rotors on these 2.8 hiluxes the thinner solid rotor, or the wider vented one? It would seem logical to use the better performing rotor with the better performing caliper, but in every upgrade instructions I've read, 4 runner calipers are called for, why?

Post by **beinthemud** » Mon Mar 23, 2009 6:05 pm

i think nemesis made that point which was changing the caliper to take the bigger rotor

Post by **vk7ybi** » Mon Mar 23, 2009 6:33 pm

I dont think you read my post correctly.

Post by **beinthemud** » Mon Mar 23, 2009 6:42 pm

vk7ybi wrote:While all the hilux/4 runner gurus are here..

The question is, are the rotors on these 2.8 hiluxes the thinner solid rotor, or the wider vented one
I've read, 4 runner calipers are called for, why?

these were the questions

Post by **-Nemesis-** » Mon Mar 23, 2009 6:45 pm

The internal diameter of the V6 pistons are beefier than the Hilux ones, even though they look similar. I 'think' the stock Hilux ones have one big piston and one smaller, where as the V6 has two biggies.

Though the bigger volume needs more pressure to get the clamping force, hence you need the bigger booster/MC as well.

Post by **-Nemesis-** » Mon Mar 23, 2009 6:47 pm

beinthemud wrote:i think nemesis made that point which was changing the caliper to take the bigger rotor

The rotor isn't bigger, it has a different offset. Hence you can't bolt V6 calipers to Hilux discs etc.

Not sure if you're grasping this whole thread mate....

Post by **beinthemud** » Mon Mar 23, 2009 6:49 pm

yeah i think i missed a step nemesis

Post by **v8zuki** » Mon Mar 23, 2009 7:01 pm

-Nemesis- wrote:
beinthemud wrote:i think nemesis made that point which was changing the caliper to take the bigger rotor
The rotor isn't bigger, it has a different offset. Hence you can't bolt V6 calipers to Hilux discs etc.

Not sure if you're grasping this whole thread mate....

what he said
if you want good brakes on a hilux or early cruiser
use the vented rotor off a late model hilux or cruiser as they are the same offset ,the ifs rotors are a different offset but the braking surface is the same size
the 4runner calipers have the bigger pistons because of weight as wagons are heavier than a ute s/cab or d/cab but to fit them you have to check your offset from memory they differ by10mm [not sure can someone clarify]
using the later model rotors and calipers on rigid axles will increase performance so long as you use the appropriate master cyl and booster

Post by **vk7ybi** » Mon Mar 23, 2009 7:10 pm

-Nemesis- wrote:The internal diameter of the V6 pistons are beefier than the Hilux ones, even though they look similar. I 'think' the stock Hilux ones have one big piston and one smaller, where as the V6 has two biggies.

Though the bigger volume needs more pressure to get the clamping force, hence you need the bigger booster/MC as well.

Stock from which model? I have hilux calipers and rotors on the rear of my 40, theyre from a mid 80s. Visually from the side they could be mistaken for 40 or 60 calipers, but as we know they are to suit the solid rotors and have the small rotor gap. They have the small and large pistons. So, did the solid rotor from the early model carry over to the newer model with the 2 large pistons, or did they go vented with that model? Either way 2 large pistons are better than one small one large, but will it physically fit? I'm using the original booster and drum brake master. The master is 1 1/8 inch bore.. Eventually I'll change to dual diaphragm booster and smaller bore master.. I can lock all 4, but it happens in about an inch of pedal and I near bust the back out of the seat doing it.

Post by **v8zuki** » Mon Mar 23, 2009 7:16 pm

the calipers changed in 89 when we got the 106 series hilux they got the vented rotors that were the same as the 60 early 75 cruisers they then changed the piston diameter when they went to ifs in the 4runners and surfs but these calipers have a different offset.
you can machine your older calipers tou suit but can get pricey
see if you can use the booster and mastercyl off the 80 series as it provides more pressure

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