Brake disc size

fifthwheel · May 15th, 2019, 12:47

Hi all, looking at changing all four discs and pads on my new to me XC90 2006 D5. I read somewhere that my front discs should measure 336mm I had a quick look the other day and think mine are 308mm ish
Has it been fitted with the wrong discs do you think or were three sizes fitted from new. 308/316/336 I have seen advertised.
I suppose I will have to fit like for like so will pull a front and rear wheel and check properly. john

cheshired5 · May 15th, 2019, 12:56

Don't rely on a quick look.
Take the wheel off and measure on the disc itself as perspective can give a very misleading measurement.

Don't ask me how I know.

Tannaton · May 15th, 2019, 17:58

All UK spec XC90's were fitted with the same size disc (336mm) which was the largest fitted by Volvo.

fifthwheel · May 15th, 2019, 19:26

Quote:

Originally Posted by Tannaton

All UK spec XC90's were fitted with the same size disc (336mm) which was the largest fitted by Volvo.

I did have a quick measure it was only very rough a few says ago when new tyres were fitted and am sure it was only just over 300mm.
I will check tomorrow front and rear.
Does this mean my car was not UK supplied and I will have to fit the same as I took off.
I have what sounds like a noisy wheel bearing it gets louder as I accelerate and changes tune as I steer left and right.
I intend to replace discs and pads,all wheel hubs, timing belt, water pump and auxiliary belt kit.
Its done 186.000 miles. Thanks John.

CJL · May 15th, 2019, 22:44

Quite often the disc size is written on the caliper carrier, but you can only see it with the wheel off

fifthwheel · May 17th, 2019, 19:42

Quote:

Originally Posted by Tannaton

All UK spec XC90's were fitted with the same size disc (336mm) which was the largest fitted by Volvo.

Update time, sorry my mistake I do have 336mm discs.
Thanks everybody I must remember to put my specs on, cant believe I made a mistake like that. john.

May 15th, 2019, 12:47	#1
fifthwheel Junior Member Last Online: Apr 20th, 2023 11:38 Join Date: Apr 2019 Location: pontefract	Brake disc size Hi all, looking at changing all four discs and pads on my new to me XC90 2006 D5. I read somewhere that my front discs should measure 336mm I had a quick look the other day and think mine are 308mm ish Has it been fitted with the wrong discs do you think or were three sizes fitted from new. 308/316/336 I have seen advertised. I suppose I will have to fit like for like so will pull a front and rear wheel and check properly. john

May 15th, 2019, 12:56	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	Don't rely on a quick look. Take the wheel off and measure on the disc itself as perspective can give a very misleading measurement. Don't ask me how I know. __________________ 2002 S60 SE D5 Manual 209000 miles

May 15th, 2019, 17:58	#3
Tannaton Bungling Amateur Last Online: Today 17:23 Join Date: Aug 2014 Location: Beverley, East Yorks	All UK spec XC90's were fitted with the same size disc (336mm) which was the largest fitted by Volvo. __________________ 2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135

May 15th, 2019, 22:44	#5
CJL Master Member Last Online: Mar 28th, 2022 18:46 Join Date: Dec 2003 Location: London	Quite often the disc size is written on the caliper carrier, but you can only see it with the wheel off

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