Attaching brake calipers to hubs?

[jonathan yee]

So from that I'm guessing you never felt anything afterwards, and therefore it wasn't a problem.

Nice to know, though the scale of vehicle weights, speed and cornering cabilities are vastly different.

yeh never had an issue with them after that.

yeh wieght is alot less tho i reckon the cornering abilities would be better......heh

[TERRA Operative]

Helicoils are the shiz.
Use a tiny bit of loctite when you install them, then some nickel based anti seize on the bolt, so it doesn't gall on the stainless helicoil.

I've repaired three M12 bolts on the super strut suspension in my AE101 (both trailing arms and a mounting plate) when the retards at The Torque Team used a rattle gun to successfully cross thread the bolts.
I fixed it all with helicoils, and they've been there for over a year now and still holding strong.

[wagonist]

i played with steves stuff on the mill the other night, and having seen it i agree its a bit fiddly

but, my vote would be for an M12x1.25mm helicoi in the mount

OR

i dont like nylocs, so id get one of the other locking nuts (theyre crimped over on the end in 3 spots) +- loctite and just man up and get a supercheap sacrificial tool (SST) to hold them while youre torquing them up.

Yes, have some Bunnings $1 special spanners already. They are the new SST.

[wagonist]

I've posted some extra pics in the first post for some additional clarity.

[Shifty]

i read somewhere don't use bolts & nuts on brakes, no idea why but i stored it away for future reference so it must have been a good reason

Personally I would do #1

[oldcorollas]

maybe you can get the title changed to steering knuckle instead of hub...
never seen a braking system work where the caliper and brake disc are bolted together

did you consider not using an 8kg brake caliper?

[wagonist]

Well personally, I grew up calling them hubs. Because to me the hub is a stub axle.

And where'd you get 8kg from?
I just stuck one on my bathroom scales (ok not highly accurate), but came up at 3.5-4kg.

[PeteH]

Because to me the hub is a stub axle.

A hub goes onto a stub axle........

Please use the helicoil idea, please don't weld nuts to the knuckle..........'tis your vehicle though.........

Cheers,

Pete

[oldcorollas]

sorry, 5kg http://www.toymods.net/forums/showpo...5&postcount=36

plus the ST215 calipers have 33% or 34% more piston area than the ST205.. so you will need either more brake line pressure (= rears locking up) or... maybe you will be lucky and the smaller ST205 calipers will balance out with the larger discs and you will get the same braking but less fade...

hub pictures
stub axle pictures
steering knuckle pictures

[brett_celicacoupe]

steve i would recommend tapping a 25 x 8mm plate with BOTH the threads. this is instead of using nuts. you may need less than 8mm pending clearance

use the next grade up from mild steel. i cant remember at this moment but i think the most common next grade up is 1040? stainless 316 may be ok.

having spring washers on the bolt head end would do a fine job of holding it in place as there is no chance a plate with 2 holes will rotate

there is also no reason why you cant make it longer on one end to help with fitting

[wagonist]

plus the ST215 calipers have 33% or 34% more piston area than the ST205.. so you will need either more brake line pressure (= rears locking up) or... maybe you will be lucky and the smaller ST205 calipers will balance out with the larger discs and you will get the same braking but less fade...

Figures? I just went out and positioned one of the replacement ST205 pistons against the back of the ST215 caliper. It'd be at least the same size. And then there's another set on the other side, so how can a 4 piston caliper have less piston area than an equivalent sized 2 piston floating?
Pads look at least the same size too.

And yes, there is an additional 25mm on each front rotor, plus the additional 50-60mm (315mm) on the rears with their 2 piston calipers.
Some work on the master cylinder may yet need to occur. Any idea if it's 1" like the ST205?

Pete, if you feel like it, you can change the thread title to suit the pedantic anal people

Brett, nice idea. Could be thicker than 8mm as the bolts are inboard of the rotor. Got an offcut of a 10mm plate here.

[oldcorollas]

Da-horses measurements of the ST202 calipers and ST205 calipers.. (202 is same as 215)
202 = 40.5mm, 205 =35mm?

for a 2 pot, you muliply by 2 since it pushes on both side of the calipers.. since with the 4 pot, 2 of them will provide the same force as the slide on the sliding caliper....

i take it you are ditching ABS then?

[wagonist]

The pistons for these ST205 calipers are about 40mm.
The ST205 rears are about 37mm.

Ditching the ABS? Where does that come in?
The sensors are fixed to the knuckles on the opposite side to the caliper & the tone wheel is on the driveshaft.
For the rear, all I need to to is trim the backing plate, & then fit the ST205 rotors over the standard handbrake shoes, then bolt the ST205 caliper onto the ST215 mounting position (no changes necessary).

[oldcorollas]

Ditching the ABS? Where does that come in? .

different volume required from the ABS actuator... different brake balance..

[the_random_hero]

I'd drill and tap for 14x1.25, if you ever want to convert back in the future then you can helicoil.