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View Full Version : Front Brake Rotors-What size?



locutist
05-08-2010, 08:31 AM
With the new creation of software for SS, I can't use the search function the way that I want. I only pulled three results for brakes, all current, nothing old. I can't determine what size rotors I need...300mm or 320mm. I own a FWD V50 T5, NOT the 2.4i. When I do web searches, it will list the 2.4i as 300mm and the 2.5i as the320mm. But some are saying that if your calipers look a certain way, then that determines your rotor size. Those pics contradict what the specs are saying. How can I tell without actually taking them off?

2mmy91
05-08-2010, 09:03 AM
320mm: http://img.photobucket.com/download-albums/v110/Boardmax157/IMG_2392.jpg

300mm: http://img.photobucket.com/albums/v110/Boardmax157/IMG_2391.jpg

locutist
05-08-2010, 09:09 AM
See, that's what I mean. Web applications will say that the V50 T5 is 320mm, but I have calipers that look like your second (300mm) photo. Why is that? Take a look at this link, http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=250625435875&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

George @ ViVA
05-08-2010, 11:17 AM
We'd like to offer some help:

http://www.vivaperformance.com/catalog/product_info.php?cPath=69_70&products_id=834

The only P1 chassis which came with 320mm rotors from the factory were the S40/V50 AWD T5 with 6-speed manual gearbox.

jedgar
05-08-2010, 11:23 AM
We'd like to offer some help:

http://www.vivaperformance.com/catalog/product_info.php?cPath=69_70&products_id=834

The only P1 chassis which came with 320mm rotors from the factory were the S40/V50 AWD T5 with 6-speed manual gearbox.

George, what would you suggest for those of us who have the smaller breaks but would like to upgrade to a bigger breaking system?

Thanks,

j.

shadowlord
05-08-2010, 01:09 PM
since this has been brought up, if i get the caliper and caliper mounting bracket is that all i need to install bigger(320mm) brakes? Ihope the spindle is not different. BTW my car is front wheel drive.

George @ ViVA
05-08-2010, 02:40 PM
George, what would you suggest for those of us who have the smaller breaks but would like to upgrade to a bigger breaking system?

Thanks,

j.


since this has been brought up, if i get the caliper and caliper mounting bracket is that all i need to install bigger(320mm) brakes? Ihope the spindle is not different. BTW my car is front wheel drive.

Here you go guys:
http://www.vivaperformance.com/catalog/product_info.php?cPath=69_70&products_id=719
:D

jedgar
05-08-2010, 05:11 PM
Is that front and rear?

shadowlord
05-09-2010, 03:41 AM
im just wondering if the caliper brackets bolt up to the spindle?

Voldsom Volvo
05-09-2010, 07:04 AM
We'd like to offer some help:

http://www.vivaperformance.com/catalog/product_info.php?cPath=69_70&products_id=834

The only P1 chassis which came with 320mm rotors from the factory were the S40/V50 AWD T5 with 6-speed manual gearbox.

That seems to be a common perception on Swedespeed, but my 2005 V50 T5 FWD with Geartronic came stock with 320mm front rotors. Perhaps it is different for the European markets.

George @ ViVA
05-09-2010, 10:15 AM
That seems to be a common perception on Swedespeed, but my 2005 V50 T5 FWD with Geartronic came stock with 320mm front rotors. Perhaps it is different for the European markets.

I should clarify my statement applies only to the North American market, as you have indicated :)


im just wondering if the caliper brackets bolt up to the spindle?

Yes they will!



Is that front and rear?

Just the fronts

locutist
05-09-2010, 11:01 AM
I should clarify my statement applies only to the North American market, as you have indicated :)




See, I bought my US Spec V50 T5 FWD 6SpM in Europe. Are you suggesting that since my T5 front calipers look like this:

http://img.photobucket.com/albums/v110/Boardmax157/IMG_2391.jpg

then I should get front rotors that are 300mm and not the 320mm? And are you saying that all non AWD S40/V50 T5 with 6-speed manual gearbox will get the 300mm?

George @ ViVA
05-09-2010, 11:14 AM
See, I bought my US Spec V50 T5 FWD 6SpM in Europe. Are you suggesting that since my T5 front calipers look like this:

http://img.photobucket.com/albums/v110/Boardmax157/IMG_2391.jpg

then I should get front rotors that are 300mm and not the 320mm? And are you saying that all non AWD S40/V50 T5 with 6-speed manual gearbox will get the 300mm?

Correct. Since your car was a US Spec build from the factory, it comes with the 300mm brake rotors. You would be a good candidate to upgrade to the 320mm rotors, per our earlier link!

locutist
05-09-2010, 11:34 AM
Great! Thanks for the info.

EngTech
05-10-2010, 06:25 PM
BRAKE CALIPER FRONT Volvo V50 2005-2010 ( 320 MM ) - also On could Buy : http://www.swedishautoparts.com/V50/Volvo-V50-brake-pads-rotors-and-related.html

There is a Core Charge , and You would have to Buy backing plates from Body shop or used .
Should be able to save some Bucks .

C4L3
05-11-2010, 09:55 AM
320mm: http://img.photobucket.com/download-albums/v110/Boardmax157/IMG_2392.jpg

300mm: http://img.photobucket.com/albums/v110/Boardmax157/IMG_2391.jpg

Man, I knew those pictures looked familiar! :D:p

To those inquiring about upgrading brake size...I performed that swap on my C30 from the stock 300mm to the 320mm setup from a V50. SUPER easy swap.

vovlo355
06-07-2010, 07:44 AM
Anyone know if the "320mm" front brakes fit with 16in wheels? I am thinking no, but want to confirm.

vovlo355
06-07-2010, 08:23 AM
I just took a look at my wheel clearance. No way the "320mm" brakes would fit on anything smaller than 17in wheels

MM
06-07-2010, 08:27 AM
I just took a look at my wheel clearance. No way the "320mm" brakes would fit on anything smaller than 17in wheels

Yes, 16s will fit.

tmtalpey
06-07-2010, 09:27 AM
They will definitely fit, assuming you choose Volvo wheels. My V50 T5 AWD 6MT came with 320mm brakes and 16" Clavas, there are no clearance issues.

vovlo355
06-07-2010, 09:31 AM
Really? When I looked at my brakes and wheels (300mm, 16in wheels), it looked like I had about 1/2 inch of clearance from caliper to wheel. If they do fit, that is good news. Thanks.

tmtalpey
06-07-2010, 11:03 AM
Yes, really. It's a close fit, but it is fine. I would not try it with non-Volvo wheels; the offset (ET) is critical since the 320mm rotors have a much larger caliper.

Frost0c
07-06-2010, 05:17 PM
i had this same problem with my 2008 v50 t5.. all the research i did showed that my car should have the 320mm rotors. but if you look on the bottom of the calipers they will say 300. i have gone back and forth with volvo about the t5 having the 11.81in (300mm) rotors. volvo told me that the t5 came with 16in rotors. so some1 some where messed up on these cars.. when i look everything up it says the 2.4i has the 11.81in(300mm) and the 2.5 t5 has the 12.60in(320mm). so i finaly ordered the 11.81 and they fit after ordering the 12.60 and taking the car apart for nothing

Frost0c
07-06-2010, 05:20 PM
i have the stock 17in wheels

tmtalpey
07-09-2010, 07:48 PM
volvo told me that the t5 came with 16in rotors. so some1 some where messed up on these cars

This is what any Volvo parts database will say - for some reason in all Volvos for many years, the rotor size isn't directly listed but rather the stock wheel size is. And, it isn't always perfectly accurate, due to different options and configuration details. Remember, Volvo is quoting replacement parts, not upgrade possibilities. That's what we're here for! :-)

beernose
09-22-2013, 11:48 PM
Last weekend I upgraded my 300mm brake system to the 320mm setup from a donor V50 T5 6-speed.

Parts that must swap:

Calipers (including brackets and pads)
Rotors
Backing plates (3 5/6" bolts hold them on)
Brake hoses


Its a direct fit. A quick bleed of fluid is all that's needed.

The feel of the larger brakes is quite amazing. I didn't expect as much difference. (Donor car had OEM pads). The original 300mm brakes were just fine, but this was worth the swap. Is it worth mega $$$??....probably not. But if you're Autocrossing or you just want better feeling brakes, then perhaps the conversion. If you have the chance to do a 'free' conversion like I did....JUMP on it. You wont regret the improved feel.

beernose
09-23-2013, 12:06 AM
Upgrade How To (sorry, no pics):


Remove the front wheels (duh!)
Remove the clips that hold the pads to the caliper bracket
Remove the caliper bolts (Torx bit needed)
Remove the calipers, support them and set them out of the way.
Remove the caliper bracket (2 bolts, 17mm heads, often locktighted from the factory)
Remove the rotors (suggest dead-blow hammer to nudge them loose)
Remove the 3 bolts holding the backing plate on (5/16 socket, remember to keep the caliper supported)
Compress the caliper piston (C-clamp or big lock-jaw pliers)
Note the orientation of the brake hose (the angle that it bends away from the hose/brake line junction
Use line wrench to remove brake line from the hose (at top inside of wheel well). Be sure to have small catch pan to catch brake fluid dripping out (keep brake fluid reservoir cap ON, it creates a vacuum and reduces the brake fluid loss into the catch pan)
You remove the old brake caliper and hose as a complete assembly.
Install upgrade brake line to hose, keeping same hose orientation as original. You can always loosen later and readjust once the caliper is installed.
Install larger diameter backing plate (5/16 socket)
Install larger rotors (ooooh, pretty)
Install caliper bracket (17mm wrench)
Install caliper (with pads)
Install caliper bolts (Torx bit)
Wrestle with the pad retaining clip (long nose pliers and a couple flat screwdrivers)
Pump up the brakes to expand the caliper pistons
Bleed brakes
Install wheels, torque lug nuts
Enjoy.


PS: This assumes the brake hoses are pre-installed to the calipers (as it was in my swap example)

PSS: Yes, OEM 16" wheels fit over the bigger brakes. The donor car had stock 16" S40 Volvo alloy rims. Plenty of room, just a little hard to clean the rim between the caliper and the rim.

beernose
09-23-2013, 12:35 AM
Oh, and for those of you concerned with the delta in unsprung weight, I have the weights for you:

300mm:

Pads (50% worn): 1.75lbs
Caliper: 7.68 lbs (including bolts)
Caliper bracket: 3.14 lbs (including bolts)
Rotor: 18.22 lbs
T5 Clava Rim with 205/55R16 Capitol Sport tire: 41.62 lbs


So that's a total of 30.79 lbs brake hardware plus the wheel assembly of 41.62 lbs.

320mm:

Pads (90% worn): 1.66 lbs
Caliper: 10.16 lbs (including bolts)
Caliper bracket: 3.06 lbs (including bolts)
Rotor: 17.34 lbs
S40 alloy rim w/ 205/55R16 Michelin tire: 36.86 lbs


So that's a total of 32.22 lbs brake hardware plus wheel assembly of 36.86lbs on my donor car.

The brake upgrade is 1.43 lbs heavier but note that the largest rotational mass is the rotor and 320mm rotor is LIGHTER than the 300mm rotor. The overall weight "penalty" of 1.43 lbs is less than a 2% increase in brake+wheel mass and the 320mm rotors are lighter where it counts...rotational mass.

Also note, that there's weight variation in different TIRE brands that most people totally ignore. The donor and receiver tires have almost a 5 lb delta with similar alloy rims. Rotational mass difference of 5 lbs at the outer edge of the wheel assembly has far more impact than the heavier caliper in the 320mm setup.

PS: Yes, if you're paying attention, I need to order new pads soon very soon!

opA
09-23-2013, 01:18 AM
We'd like to offer some help:

http://www.vivaperformance.com/catalog/product_info.php?cPath=69_70&products_id=834

The only P1 chassis which came with 320mm rotors from the factory were the S40/V50 AWD T5 with 6-speed manual gearbox.

Now it was long time ago you wrote this but thats wrong.

Volvo V50/S40 T5 04-07 FWD and AWD = 300mm
V50/S40N T5 08-up FWD and AWD = 320mm

kova
09-23-2013, 06:14 AM
Oh, and for those of you concerned with the delta in unsprung weight, I have the weights for you:

300mm:

Pads (50% worn): 1.75lbs
Caliper: 7.68 lbs (including bolts)
Caliper bracket: 3.14 lbs (including bolts)
Rotor: 18.22 lbs
T5 Clava Rim with 205/55R16 Capitol Sport tire: 41.62 lbs


So that's a total of 30.79 lbs brake hardware plus the wheel assembly of 41.62 lbs.

320mm:

Pads (90% worn): 1.66 lbs
Caliper: 10.16 lbs (including bolts)
Caliper bracket: 3.06 lbs (including bolts)
Rotor: 17.34 lbs
S40 alloy rim w/ 205/55R16 Michelin tire: 36.86 lbs


So that's a total of 32.22 lbs brake hardware plus wheel assembly of 36.86lbs on my donor car.

The brake upgrade is 1.43 lbs heavier but note that the largest rotational mass is the rotor and 320mm rotor is LIGHTER than the 300mm rotor. The overall weight "penalty" of 1.43 lbs is less than a 2% increase in brake+wheel mass and the 320mm rotors are lighter where it counts...rotational mass.

Also note, that there's weight variation in different TIRE brands that most people totally ignore. The donor and receiver tires have almost a 5 lb delta with similar alloy rims. Rotational mass difference of 5 lbs at the outer edge of the wheel assembly has far more impact than the heavier caliper in the 320mm setup.

PS: Yes, if you're paying attention, I need to order new pads soon very soon!

So, 300mm rotor weights more than 320mm? Who would expect that..

Screamindman
09-23-2013, 06:31 PM
So, 300mm rotor weights more than 320mm? Who would expect that..

I hear ya bro. You'd totally think otherwise...that would be a good bar bet type of question lol.

Adrenaline406
09-23-2013, 07:33 PM
Now it was long time ago you wrote this but thats wrong.

Volvo V50/S40 T5 04-07 FWD and AWD = 300mm
V50/S40N T5 08-up FWD and AWD = 320mm

That isn't correct. My '05 is 320mm because T5 AWD M66.

Screamindman
09-24-2013, 09:15 AM
Saw an facelift Rdesign c30 at my work...with 300mm brakes which I thought for sure would have been 320's...another bet I would have lost. The only thing I know is that I have 320mm's lol

kova
09-24-2013, 01:13 PM
I hear ya bro. You'd totally think otherwise...that would be a good bar bet type of question lol.

Yep, sure it would! :D

opA
09-24-2013, 01:45 PM
Saw an facelift Rdesign c30 at my work...with 300mm brakes which I thought for sure would have been 320's...another bet I would have lost. The only thing I know is that I have 320mm's lol

Surely was a C30 T5.. T5 and D5 has thoose brakes :)

Tim_H
09-24-2013, 02:31 PM
As George stated earlier in this thread there's a difference in which cars have the 320mm brakes depending on the market. North America has 320mm in less models than Europe.

Screamindman
09-24-2013, 05:39 PM
Surely was a C30 T5.. T5 and D5 has thoose brakes :)

Coulda swore it had the little Rdesign plaque in the front grille...had Rdesign steering wheel and gear selector...maybe the European Rdesigns come standard with the 320mm's. The mystery continues lol.

EngTech
09-24-2013, 07:01 PM
I hear ya bro. You'd totally think otherwise...that would be a good bar bet type of question lol.

Must have missed something ? weighted 2 sets of Rotors on the 320mm set up Drilled and Non-Drill Both within 7 Oz of each other 21.5 lbs to 22.1 lbs - on Certified Scale .

EngTech
09-24-2013, 07:08 PM
That isn't correct. My '05 is 320mm because T5 AWD M66.

It was a Sport Option at First offered on the M66 _maybe the Auto . Then the 320mm Brakes became std. on the M66 in 2007 / Auto still had the 300mm Rotors & Lighter calipers .

I thought the 320mm Brake set up became std. once Volvo only offered the R for US models , but not sure anyone - / -

beernose
10-08-2013, 12:34 AM
Must have missed something ? weighted 2 sets of Rotors on the 320mm set up Drilled and Non-Drill Both within 7 Oz of each other 21.5 lbs to 22.1 lbs - on Certified Scale .

EngTech: What was the thickness of those 320mm rotors?

Every spec I see online says new is 25mm and discard is 23mm. But when I compared the 320mm and 300mm rotors side by side, the 300's were very obviously thicker (contributing to their increased weight). Which leads me to believe that the 320mm new/discard spec is not the same as the 300mm rotor.

Anyone else have thickness measurements from a 320mm rotor? OEM or otherwise? Used or new?

beernose
10-14-2013, 09:11 AM
Bump