Early brembo caliper bolts.

[fatnfast]

Over Christmas I'm fitting stainless hoses to my 1100rt and would also like to smarten the rusty bolts up with some nice stainless steel ones. Its the four that hold the two caliper halves together that I'm after. Does anybody have any idea the length and pitch of these bolts?
Many thanks.

Its this type:

 

[Welshman]

Over Christmas I'm fitting stainless hoses to my 1100rt and would also like to smarten the rusty bolts up with some nice stainless steel ones. Its the four that hold the two caliper halves together that I'm after. Does anybody have any idea the length and pitch of these bolts?
Many thanks.

Its this type:

No I dont, and would not replace safety critical bolts like these with an alternative, rather see what they are its stamped on the head and get exact replacements..

 

[thornley]

Do not use stainless bolts in ANY safety critical applications. They are not tested and are simply not suitable. Unless you can find stainless bolts with full traceability (and you will not) take out the old, clean and hammerite them.

Might look good but nickel and chrome work hardens with repeated heating and cooling. NO NO NO

 

[ianboydsnr]

hey up, the brake safety police have arrived!

 

[fatnfast]

Powerhouse have been rebuilding calipers and providing kits for years. They were even featured in a glossy bike mag a while back showing the quality of their work.
They sell stainless caliper bolts to join the two caliper halves (not for the bmw brembos though, although I have just messaged them).

Here for example: http://www.ebay.co.uk/itm/Stainless...mo-Kawasaki-Suzuki-Honda-Yamaha-/150689244929

So who is right??

 

[cookie]

So who is right??

unquestionably those who say to use the OEM bolts.

having said that, you'd probably be fine with the stainless. many people do fit them with no problem. what is your attitude to risk? how lucky do you feel?

 

[ian6760]

You can buy little caps that just click in to the hex socket in various colours, I'd be inclined to leave the bolts and hide tatty heads.

 

[cookie]

just buy new bolts?

 

[thornley]

hey up, the brake safety police have arrived!

Most stainless sold in the UK has no traceability, is not tested and at best comes with chemistry only certification. On the other hand BMW keep records against every fastener used on its bikes, tested and batch traceable (exception is cover screws). Full mechanical properties recorded. Fit the nice shiny bolts/screws if you want.

 

[thornley]

Powerhouse have been rebuilding calipers and providing kits for years. They were even featured in a glossy bike mag a while back showing the quality of their work.
They sell stainless caliper bolts to join the two caliper halves (not for the bmw brembos though, although I have just messaged them).

Here for example: http://www.ebay.co.uk/itm/Stainless...mo-Kawasaki-Suzuki-Honda-Yamaha-/150689244929

So who is right??

Ask them for full chemistry and mechanical testing back to first melt. Then decide

 

[Grizzly]

HI Fatnfast,
I fitted a set of stainless screws to my 1150 Brembo's - I know I probably pushed the safety boundaries - but they've been in for 150K now and I'm still ok
Anyway, I bought the set online - but no idea where now - but I'm sure I've still got the originals in the garage somewhere so I can measure them up for you if you wish?
The screws are "specials" - because the brake pads use the plain shank of the bolts as guide pins so the thread length is relatively short in relation to the overall length.
When changing them you only remove the old bolts one at a time and fit AND torque a new bolt before moving on to the next.

Cheers......................Grizzly

 

[Grizzly]

Screw Dimensions

Ok,
I will try and steer this post back to the original question

I found my original screws in the garage. All threads are M8 x 1.25pitch ( ie M8 coarse to ISO 724 standard)

EACH caliper needs 2 long screws and 2 short screws.

Long screw....65 mm long (under head) threaded section ONLY 15 mm long.
Short screw...50 mm long (under head) threaded section 30mm long

Hope this is some help.......................Grizzly

 

[thornley]

Ok,
I will try and steer this post back to the original question

I found my original screws in the garage. All threads are M8 x 1.25pitch ( ie M8 coarse to ISO 724 standard)

EACH caliper needs 2 long screws and 2 short screws.

Long screw....65 mm long (under head) threaded section ONLY 15 mm long.
Short screw...50 mm long (under head) threaded section 30mm long

Hope this is some help.......................Grizzly

Yes totally correct BUT stainless steel produced in Brazil does not meet the specifications. My only point. Seems some people on here and not you, do not realise the testing requirements in producing safety critcal parts. Brakes are just a little important on a motor bike,no?

 

[Steptoe]

Thornley, sorry to hear the sad news about your mum, glad you could be with her when she passed away.. God bless.

 

[gerry b]

I was in a BMW Dealership in good old USA last year getting tyres changed, I got charged for new front brake caliper mounting bolts, on questioning the reason for new bolts the mechanic stated that they always replace and torque the bolts, this is required by BMW. So whatever about reusing your old bolts I would not go stainless.

 

[thornley]

Accepted and thank you. yes I am an arrogant git but it is my life.

 

[fatnfast]

Ok,
I will try and steer this post back to the original question

I found my original screws in the garage. All threads are M8 x 1.25pitch ( ie M8 coarse to ISO 724 standard)

EACH caliper needs 2 long screws and 2 short screws.

Long screw....65 mm long (under head) threaded section ONLY 15 mm long.
Short screw...50 mm long (under head) threaded section 30mm long

Hope this is some help.......................Grizzly

many thanks Grizzly

So no chance of just using normal threaded screws . If you do remember where you got them though....

 

[Grizzly]

You would still be able to use "standard" screws but it would need a lot of searching ..............................

For example, for the long screw you would need to search for a screw which had a PLAIN length of 50 mm - the threaded end could be any length - you would then cut off the excess thread to leave a screw with 65 mm length under head, with 50 mm plain and 15 mm threaded
Does the above make sense to you?

EG.... quick search on fleabay gives a result which is close as an example - more research would do better?
http://www.ebay.co.uk/itm/M8-8mm-A4...rial_Nails_Fixing_MJ&var=&hash=item92b6dbbeec
Using M8 x 80 then cut off 15 mm ???

Cheers......................Grizzly