8 replies to this topic

[maccers]

Am fitting cooper s disc brakes, Haynes Manual suggests 57 nm for the drive flange to disc brake screws. Seems a bit extreme?

[HarrysMini]

Sounds about right to me. 

[TrboDieselPwrd]

I question this as well since it's quite difficult to apply 57nm (~40 ft-lbs?) of torque with a posidrive screwdriver.  Sure enough that's the spec, so would a posidrive bit into a torque wrench be the right way to go about doing this?

 

I'm afraid of possibly stripping the screw so I've got them in there as tight as I could manage by hand.  

[Gremlin]

Think 2 things are being talked about, harrysmini is right, you might be thinking of the drum screws turbodiesel, the drive flange bolts are about 5/8 af not posi screws

[the.stroker]

Think 2 things are being talked about, harrysmini is right, you might be thinking of the drum screws turbodiesel, the drive flange bolts are about 5/8 af not posi screws

Cooper S brakes use screws instead of bolts to hold the drive flange to the disc assy

[the.stroker]

SF604051
SCREW DRIVE FLANGE COOPER S


Countersunk crosshead screw. 1/4"unf / 16mm(3/8") total length.

To hold the drive flange to the brake disc on the Cooper S type 7.5" wide brake set up. Also holds striker plate for door.
£0.23 exc vat
£0.28 inc vat

( Taken from the minispares website )

[A-Cell]

Assuming this 1/4in UNF screw is grade S, then 10 ft-lb or 13 Nm torque. The 57Nm refers to the 3/8in drive flange bolt on the 8.4 inch disc for the 12 inch wheel.

[TrboDieselPwrd]

Think 2 things are being talked about, harrysmini is right, you might be thinking of the drum screws turbodiesel, the drive flange bolts are about 5/8 af not posi screws

I think there is some confusion going all around here, including on my part...

 

The OP mentions Cooper 'S' brakes which I interpret as 7.5" with the 4 countersunk posidrive screws (which are similar to drum screws) holding the disc to the drive flange.  The larger 8.4" (or other?) discs I assume have bolts where the larger torque numbers are applied.  

 

10 - 15 ft-lbs for the Cooper S screws sounds right.  My (and perhaps others') confusion stems from the Haynes manual, which states only a single torque value (57 Nm) for disc to drive flange screws. 

 

Thanks for all of the clarifications!

[maccers]

Hi all, yes it was the posi drive type screw, formerly I only done them wrench tight for fear of not being able to undo them easily. I guess the 57 nm is for the larger discs.