Brakes: 850: - Front Calliper Bleed nipple size and rate

Moose850 · Jul 20th, 2019, 21:10

Can someone tell me the size and thread rate of the front caliper bleed nipples.

volvo again · Jul 21st, 2019, 11:54

Front M10 x 1.00

Rear M8 x 1.25

Moose850 · Jul 21st, 2019, 22:06

Thank you for that.

amazondean · Jul 23rd, 2019, 11:34

It is odd that Volvo used a fine thread on the front and a standard course thread on the rear!

Bob Meadows · Jul 23rd, 2019, 16:19

Hex head probably a different size as well? They are on a ’97 V70
Bob.

acshortt5 · Jul 23rd, 2019, 16:29

Quote:

Originally Posted by amazondean

It is odd that Volvo used a fine thread on the front and a standard course thread on the rear!

It's probably a fine thread on the front as there is probably more vibration being transmitted through the front caliper (given it's the driven axle) as fine threads are better at resisting backing out than standard threads.

As an example that I know of on MX5's there were issues with the alignment bolts coming loose so mazda switched to finer threads on the bolts to solve the problem.

volvo again · Jul 23rd, 2019, 16:33

Quote:

Originally Posted by Bob Meadows

Hex head probably a different size as well? They are on a ’97 V70
Bob.

Yes, rear is 8mm, fronts 11mm...I think

Moose850 · Jul 23rd, 2019, 23:51

Quote:

Originally Posted by volvo again

Yes, rear is 8mm, fronts 11mm...I think

From what I can gather the rear M8's have a 9mm AF hex and the front M10's have an 11mm AF hex.

Moose850 · Jul 23rd, 2019, 23:53

Quote:

Originally Posted by acshortt5

It's probably a fine thread on the front as there is probably more vibration being transmitted through the front caliper (given it's the driven axle) as fine threads are better at resisting backing out than standard threads.

As an example that I know of on MX5's there were issues with the alignment bolts coming loose so mazda switched to finer threads on the bolts to solve the problem.

That sounds very logical.

Jul 20th, 2019, 21:10	#1
Moose850 Member Last Online: Sep 17th, 2020 14:17 Join Date: Apr 2010 Location: Norfolk, England.	Front Calliper Bleed nipple size and rate Can someone tell me the size and thread rate of the front caliper bleed nipples. __________________ *The Power of the Moose* 850 2.0L 20 valve 2WD Estate 1996. MK1 Escort Twin Cam 1969.

Jul 21st, 2019, 22:06	#3
Moose850 Member Last Online: Sep 17th, 2020 14:17 Join Date: Apr 2010 Location: Norfolk, England.	Thank you for that. __________________ *The Power of the Moose* 850 2.0L 20 valve 2WD Estate 1996. MK1 Escort Twin Cam 1969.

Jul 23rd, 2019, 11:34	#4
amazondean amazondean Last Online: Yesterday 12:19 Join Date: Oct 2004 Location: Nettleton Market Rasen	It is odd that Volvo used a fine thread on the front and a standard course thread on the rear! __________________ There are only two things in life that is easy. One's lying down and the other is handing your credit card over. everything else has a degree of skill. Volvo 850 TDI, 850 TDI, 850 TDI Volvo V70 TDI, V70 TDI, Volvo V70 XC, (99)

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Jul 21st, 2019, 11:54	#2
volvo again Master Member Last Online: Today 10:46 Join Date: Jun 2018 Location: Presteigne, mid Wales	Front M10 x 1.00 Rear M8 x 1.25

Jul 23rd, 2019, 16:19	#5
Bob Meadows Premier Member Last Online: Today 19:45 Join Date: Sep 2017 Location: STANDISH LANCASHIRE	Hex head probably a different size as well? They are on a ’97 V70 Bob.

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