Rear backplate torque settings ?

chris75 · 9th April 2020, 13:58

I'm fitting new rear backplates to my brakes . Going well , but confused over the torque settings for the 4 hex allen screws which fasten the backplate to the trailing arm . Rave says "disc shield bolts" are 9Nm , and that "backplate to hub torx bolts" are 64Nm . Which is it ? My screws are not torx but hex / allen heads . 9 seems low , but 64 seems high ; they were quite tight to undo , but then aren't they always !

chris75 · 9th April 2020, 15:44

Ok , think I've sorted it

I tightened them with a standard socket handle to what I thought would be a suitable tightness , like we did before we had torque wrenches , then checked what I had by testing it with incremental adjustments on my torque wrench . Turned out I had tightened it to about 60 Nm !
So nipped them up to 64 , job done . Glad I didn't leave them at 9 Nm , although they did feel secure !
Only thing I am left wondering is what on earth is a disc shield bolt ?

clf · 9th April 2020, 16:37

Quote:

Originally Posted by chris75

Only thing I am left wondering is what on earth is a disc shield bolt ?

Front = disc shield?
Rear = back plate?

chris75 · 9th April 2020, 16:47

Quote:

Originally Posted by clf

Front = disc shield?
Rear = back plate?

I think you are right !!!

the front is a different animal .

clf · 9th April 2020, 16:59

Quote:

Originally Posted by chris75

I think you are right !!!

the front is a different animal .

purely a guess, but the rears carry the handbrake mechanics, so will need quite a bit more strength. Fronts are just there to be pretty lol

COLVERT · 9th April 2020, 19:36

Quote:

Originally Posted by clf

Front = disc shield?
Rear = back plate?

I note the question marks. Does this mean you want confirmation ??--

clf · 9th April 2020, 20:35

Quote:

Originally Posted by COLVERT

I note the question marks. Does this mean you want confirmation ??--

Not me no, but confirmation for Chris would be beneficial.

chris75 · 9th April 2020, 20:38

I can see that the front "backplate" is a different matter to the rear one , being held on by 3 small bolts rather than 4 large ones and this would explain the difference in Torque . Just a shame that Rave did not describe them better ; "front " and "rear " would have helped !

Blink · 10th April 2020, 10:28

Have you got a torque wrench that goes as low as 9Nm Chris?

I could do with a low range model - the lowest mine will go is 30Nm.

Perhaps a bike wrench is the best bet - e.g. https://www.wiggle.co.uk/lifeline-x-...ue-wrench-set/

chris75 · 10th April 2020, 11:38

Yes , I bought one to work on alloy parts where the principal of tighten hard by hand then give it a tap with a hammer doesn't work well

It's a Sealey Premier STW1011 and has a range of 7-112 Nm . I like it ; looks and feels well made and is satisfying to use

I have another Sealey that goes 30-210 . After 210 I reach for my breaker bar and give it an extra nip …….

9th April 2020, 13:58	#1
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	Rear backplate torque settings ? I'm fitting new rear backplates to my brakes . Going well , but confused over the torque settings for the 4 hex allen screws which fasten the backplate to the trailing arm . Rave says "disc shield bolts" are 9Nm , and that "backplate to hub torx bolts" are 64Nm . Which is it ? My screws are not torx but hex / allen heads . 9 seems low , but 64 seems high ; they were quite tight to undo , but then aren't they always ! __________________ Who said it was simples ?

9th April 2020, 15:44	#2
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	Ok , think I've sorted it I tightened them with a standard socket handle to what I thought would be a suitable tightness , like we did before we had torque wrenches , then checked what I had by testing it with incremental adjustments on my torque wrench . Turned out I had tightened it to about 60 Nm ! So nipped them up to 64 , job done . Glad I didn't leave them at 9 Nm , although they did feel secure ! Only thing I am left wondering is what on earth is a disc shield bolt ? __________________ Who said it was simples ?

9th April 2020, 20:38	#8
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	I can see that the front "backplate" is a different matter to the rear one , being held on by 3 small bolts rather than 4 large ones and this would explain the difference in Torque . Just a shame that Rave did not describe them better ; "front " and "rear " would have helped ! __________________ Who said it was simples ?

10th April 2020, 11:38	#10
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	Yes , I bought one to work on alloy parts where the principal of tighten hard by hand then give it a tap with a hammer doesn't work well It's a Sealey Premier STW1011 and has a range of 7-112 Nm . I like it ; looks and feels well made and is satisfying to use I have another Sealey that goes 30-210 . After 210 I reach for my breaker bar and give it an extra nip ……. __________________ Who said it was simples ? Last edited by chris75; 10th April 2020 at 11:44..

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10th April 2020, 10:28	#9
Blink Posted a thing or two Rover 75 Saloon Join Date: Apr 2019 Location: Under the car Posts: 1,840 Thanks: 210 Thanked 244 Times in 221 Posts	Have you got a torque wrench that goes as low as 9Nm Chris? I could do with a low range model - the lowest mine will go is 30Nm. Perhaps a bike wrench is the best bet - e.g. https://www.wiggle.co.uk/lifeline-x-...ue-wrench-set/