Utter Frustration, Rear Brake Caliper Carriers

[ttelracs]

OK, final attempt earlier this evening before reaching for can of petrol and matches and got it off.  Once off I realised that I had only drilled though half of each bolt and it was rusted itself to the stub axle, but it's off now.  I will need to get some high tensile bolts before reassembling though and use loctite to secure them as by all accounts the stainless steel ones I have will not be strong enough !

[MereKat]

The bolts are £2.56 each from VW iirc

[Ess_Three]

We used SS bolts to secure many tonnes of stone to buildings! So SS bolts are not very much less strong than mild steel.

They do tend to relax a little so not really the best for brakes.
Mind you SS bolts are used extensively in some Custum Cars.

That's a sweeping statement, right there.

Bolts are graded for strength.
All bolts.
You can get hi tensile stainless...and even titanium bolts.
And you can get cheap-ass ebay toffee strength bolts of unknown strength.

Rear calliper carriers are at least 10.9...maybe even 12.8. That's for a reason.
There tends not to be too much of a lever moment on tonnes of stone hanging off buildings...the stone tends to remain where you put it!
Brakes carry leverage loads and suffer heat cycling.

I would have no issues running stainless bolts if they are high tensile...but every brake securing bolt I've seen had been high tensile for a reason...and it's a brave man who would risk unknown bolts on the thing that stops you!

[Wayne]

That's a sweeping statement, right there.

Bolts are graded for strength.
All bolts.
You can get hi tensile stainless...and even titanium bolts.
And you can get cheap-ass ebay toffee strength bolts of unknown strength.

Rear calliper carriers are at least 10.9...maybe even 12.8. That's for a reason.
There tends not to be too much of a lever moment on tonnes of stone hanging off buildings...the stone tends to remain where you put it!
Brakes carry leverage loads and suffer heat cycling.

I would have no issues running stainless bolts if they are high tensile...but every brake securing bolt I've seen had been high tensile for a reason...and it's a brave man who would risk unknown bolts on the thing that stops you!

^^Sound advice, genuine bolts are not that expensive why risk it.

[Len]

We used SS bolts to secure many tonnes of stone to buildings! So SS bolts are not very much less strong than mild steel.

They do tend to relax a little so not really the best for brakes.
Mind you SS bolts are used extensively in some Custum Cars.

That's a sweeping statement, right there.

Bolts are graded for strength.
All bolts.
You can get hi tensile stainless...and even titanium bolts.
And you can get cheap-ass ebay toffee strength bolts of unknown strength.

Rear calliper carriers are at least 10.9...maybe even 12.8. That's for a reason.
There tends not to be too much of a lever moment on tonnes of stone hanging off buildings...the stone tends to remain where you put it!
Brakes carry leverage loads and suffer heat cycling.

I would have no issues running stainless bolts if they are high tensile...but every brake securing bolt I've seen had been high tensile for a reason...and it's a brave man who would risk unknown bolts on the thing that stops you!

Obviously know nothing about stonework and modern buildings!
Try looking up sometimes!
Quite often the biggest stones and the cornices at the top of the building and they project quite a bit!
I could go dig out pull-out tests and bolt shear tests but I cant be arsed and would mean nothing to folk on here anyway.

So it wasnt such a sweeping statement was it!

[spikenipple]

There shouldn't be this assumption that stainless is weaker or in any way inferior. Provided that the specification matches that of the bolt it is replacing, it can even be a better alternative due to the corrosion resistance, cost aside. As long as you don't go buying any old dodgy ebay bolt and hope it works, much the same risk you wouldn't take when buying a carbon steel item, there shouldn't be a problem.

[Ess_Three]

Obviously know nothing about stonework and modern buildings!
Try looking up sometimes!
Quite often the biggest stones and the cornices at the top of the building and they project quite a bit!
I could go dig out pull-out tests and bolt shear tests but I cant be arsed and would mean nothing to folk on here anyway.

So it wasnt such a sweeping statement was it!

I know enough about buildings to know there aren't the forces applied using rotational leverage, as buildings don't tend to spin at 1000s or RPM and need stopping in a hurry.
Not in my world anyway.
Nor do they heat cycle like car brakes.
Again, not in my world.

But then again, if I looked up...I may notice that.
Then again...I doubt it.

[JC]

should i put the aircraft industry spin to this aswell  . . . . . . 

[Screech16v]

should i put the aircraft industry spin to this aswell  . . . . . . 

Go on then chuff.

[tweed]

May as well 

When I put still up we would use 20, 24mm 8.2 bolts to hold up one 3000kg I beam. I little 200kg beam would have 8, 20mm 8.2 bolts

What are the forces on the rear brake bolts you think?