Rear Brake Disc Bolts

[bourne17]

I am about to replace my standard rear discs, could anyone let me know what the torque setting is for the 4 retaining bolts??

 

Many thanks

[Stationary M25 Traveller]

Looking at my build manual .... it shows hub nuts (the big nut) as 200 lbft and hub mountings at 35lbft. Presume this means disc to hub ?

 

 

[skydragon]

Just did this job last weekend. Few tips....

 

Because the bolt heads are very thin you need to get a socket which has no rounded lip on the end of the socket. I ended up machining a few mm off the end of one of mine to achieve this, so the socket end was flat.

 

I'd recommended putting a blowtorch on each of the bolt heads for 30-40 secs, before you try ungoing them. Also scape away any loose rust, so the socket can get a good grip.

 

You'll need a 41mm socket for the hub nuts and a breaker bar to undo them.

 

To get 200ib/ft of torque, you don't need a torque wrench. Just tighten the hub nuts (remember the passenger side has opposite thread) up a bit by hand and then (presuming you weigh approx 180ibs) stand on the breaker bar approx 14" away from the socket centre.

 

 

Buy some new bolts and also new hub nuts for fitting.

 

Remember to use threadlock on the new disk to hub bolts when you fit them and copperslip on everything else, inc a very light coating on back of brake pads.

 

(applogies if you already know the above)

 

 

[skydragon]

The correct torque for the brake disk to hub bolts is 25ib/ft which is 34NM

 

Just to avoid any confusion. Ref my last post don't use copperslip on the brake caliper bolts.

 

 

 

Edited by - skydragon on 29 Nov 2010 10:31:18

[bourne17]

Thankyou for your detailed responses, they are much appreciated.

 

I did manage to get the bolts out over the weekend, ground down the end of the socket as suggested and used a breaker bar. All went well after the first one.

 

Thanks again

[Stationary M25 Traveller]

Quite happy to be corrected, hence the ? in my original post. CC torque figure tables not very clear. Perhaps the 35 lbft related to attachment of deDion ears to tube ?