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940 Brake Upgrade With 302mm Discs.

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Old Jul 2nd, 2012, 23:44   #1
Steve940estate
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Default 940 Brake Upgrade With 302mm Discs.

Now that I have fitted the larger brakes onto my car and itís all working I thought it would be useful to list all the separate parts and give details of those that were modified.

The standard front discs fitted to later 940ís with Girling calipers are 280mm and by using parts from later models you can fit 302mm discs, matching ATE calipers and have a better range of brake pads to choose from.

These parts were fitted to some Phase 1 V70ís, C70ís, and are often used to upgrade 850ís, the only disadvantage is that you need 16Ē wheels or larger to clear the brake calipers. Some have found that certain genuine 16Ē Volvo alloys can hit the calipers so you need to check the ones you plan on using clear OK.

While this a fairly straightforward job you will need to make some modifications to the brake caliper carriers, fit some spacer washers where they mount on the front struts and use longer mounting bolts.



Parts List.



Brake Discs.
For these you need 302mm diameter discs. I went for genuine Volvo ones part number 31262095.

Brake Caliper Carriers.

There are 2 Volvo part numbers for these. Until you see both the only obvious difference is the price !
When you open the boxes itís obvious one is plated and the other has a paint finish. I am pretty sure the plated one is a brand new item and the cheaper painted one is refurbished.
Another thing to watch is that my painted one had difference in the casting despite having the same part and casting number. Others have thought in the past that this difference in the castings was why the price and part numbers are different but I donít think thatís correct.
Volvo part numbers for these are,
8251319 for the cheaper painted version.
8602456 for the more expensive plated ones.

To fit the carriers you need to provide clearance for the ABS sensor ring on the back of the hub. Itís easier to show what is needed with a few pictures. After filing I painted the bare bits so it would look nice for 5 minutes at least.





Spacer Washers.
You will need a total of 4 spacer washers to allow for differences in the brake disc dimensions. I made mine from 25mm diameter steel bar with a thickness of 6.3mm. The thickness isnít super critical so going slightly bigger, ľ ď or 6.5mm would be OK. When you fit the carrier over the disc you will see the carriers are a bit rough being just castings.

Carrier Mounting Bolts.
Due to the spacer washers the carrier mounting bolts need to be slightly longer. I bought some new M12x 35mm socket cap bolts.

Brake Calipers.

Volvo calipers are over £100 each so I went for reconditioned exchange Delphi ones. If you ask for Volvo 850 ones itís easy as they are all the same.
Delphi part number LC4657 and LC4658

Caliper Slider Pins.

These donít come with the callipers unfortunately and the factors I asked donít sell them. Volvo ones are quite expensive at around £10 each. You can get them for about £4 each from Big Red which is quite a lot better. I found that because they are a fairly standard part made for ATE brakes they are fitted to other cars. Probably the most common use of ATE brakes is on Vauxhalls and checking part numbers found a lot of Cavaliers used them. I ended up using good used ones as a friend had some spare so if you have time and want to save a few quid a hunt round a breakers might be worthwhile.
Volvo part number for these is 30648017
The ATE number is 11.8171-0008.1

Brake Hoses.
I re-used my original hoses along with the stainless steel extensions that fit between them and the callipers. If you feel the hoses look stretched you can use some slightly longer hoses, listed for Phase 1 V70ís with 16Ē wheels.
Here are the numbers for each.
3546813 335mm long and fitted as standard to 940ís.
9191400 355mm long.



Brake Pads.
I decided to try the police spec ones that are available for 850ís and V70ís. This is really down to personal preference. Anything made for the 850 will fit along with those from V70ís and C70ís as long as they use the same callipers.
Part number for the police spec ones are 30645240 and are supposed to not have sensor wires. Mine came with them so I carefully cut them off.

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Old Jul 3rd, 2012, 00:11   #2
Neoott
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Great post here mate very much like it. Looks like these are going to give you a niec amount of stopping power, might have to look into something like this for mine. Dont know if it will all fit a 700 too? (fingers crossed)
Also where did you get your nice wheel spacers? are they 20mm?
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Old Jul 3rd, 2012, 00:48   #3
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I'm pretty sure everything fits the same. The only differences are that some earlier 700 series cars has discs with integral hubs. If the car isn't fitted with ABS the caliper carriers should bolt straight on. The brake master cylinder and servo might be different as well.

The brakes are better but I haven't finished yet. I am hoping that a change of brake servo and brake pedal to later spec versions will finish the job properly. Because the caliper pistons are very similar in size you only gain from the bigger disc diameter. The later servo will give a bit more bite hopefully.

The spacers are German made H&R ones, but were sent from the states !
After much searching it was easier to order them from IPD and they were still a bit cheaper then getting them elsewhere.

Thanks for the comments, took a while to find out all the right bits to get and if anyone wants to know anything specific just ask.

Last edited by Steve940estate; Jul 3rd, 2012 at 00:50.
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Old Jul 3rd, 2012, 01:00   #4
Neoott
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Cheers, i do believe the master and servo are different. But in theroy i can replace all for the later version? Mine isn't ABS so that makes things easier. Im going to strip down my drivers side caliper at the weekend anyway as its started slightly binding so ill do some messuring If this doesnt work for mine, i have a set of Mitsubishi GTO calipers and discs in the shed (look very much like these http://www.ebay.co.uk/itm/2000-MITSU...item3f0e06e227) maybe i can make some carriers up for these
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Old Jul 3rd, 2012, 01:42   #5
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There seems to be a few versions of everything, and then there are cars without ABS !
If your car has twin piston front calipers it might have two brake lines per side as well. You might need to do a bit of re-plumbing, fit a different master cylinder and a bias valve.
Some of the info on Turbobricks might be helpful as there are more people on there updating older cars.
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Old Jul 3rd, 2012, 02:46   #6
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Default Spacers

Are the spacers principally because most of the 16 inch wheels are 43mm offset rather than 20 or 25?
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Old Jul 3rd, 2012, 12:44   #7
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Quote:
Originally Posted by rogerthechorister View Post
Are the spacers principally because most of the 16 inch wheels are 43mm offset rather than 20 or 25?
Hi yes thats the only reason I personally would use them. I wanted to fit wider, lower profile tyres but wanted steel wheels.

Some people who have fitted these brakes to 850's and have experienced wheel clearance problems have used a thin spacer to help things but it isn't something I have first hand knowledge of.
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Old Jul 4th, 2012, 11:41   #8
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Excellent work! Everything needed all in one place.

You might want to add a note about the type of bolts required. My tame engineer says they need to be very strong, so Grade 12.9 with a rolled thread would be best.

Would you mind putting up the prices of the parts you bought? They will change, but they'll be helpful to get an idea of where to get parts. Volvo spares are often not as expensive as people think.
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Old Jul 4th, 2012, 12:50   #9
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The bolts I used were just standard ones from a local engineering supply shop. In the length I needed they ony had completely threaded ones. In the end I just bought the shortest ones they had with a plain shank on and cut them to length. One of my to do jobs is to find some better ones although standard black socket caps are higher tensile then normal hex bolts.

I did think of adding costs but the options are endless really. You could buy all the parts from Volvo, if you get them from the companies on the site you can get a fair discount. You have to consider the cost of postage, plus the cost of returning the exchange items.

While fitting these isn't as expensive as getting a complete kit from somewhere it still adds up. I might add some costs and a rough total once I have recovered from spending so much !

There is more info in some of the other threads and here,
http://www.volvoforums.org.uk/showthread.php?t=154501

Last edited by Steve940estate; Jul 4th, 2012 at 12:54.
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Old Jul 5th, 2012, 19:53   #10
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I have been looking at the cost of the basic brake parts.

Volvo Parts.
Carrier = £21
Disc = £53
Pads = £46

I didn't buy the guide pins as I had used ones. These are about £10 each from Volvo.

Delphi Brake Calipers.
Volvo ones are about £120 each so I bought Delphi recon ones at £60.44 each.

With the Vat on the parts I bought it cost about £360. If you get new longer hoses and new guide pins then it will probably add another £80 to £100 for Volvo parts.
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