The ebay item id given is invalid, no result has been sentI won a 280mm disc and conversion set for the rear brakes for £132 on e-bay and I thought I would trial it for you and see what difference it makes.
I won the conversion kit from this ebayer
Is it a bargain?
Well, VHS do a 266mm brake conversion kit for around £395.50.
So, if they work as planned then they are slightly better and cost £263.50 less.
They allow you to keep your current calipers while increasing braking torque and thermal dissipation. This does away with problems involving the hanbrake mechanism etc that you may get if you change the calipers.
I will tchange them first with no change to the front brakes or the pads and see how it compares. I will then be fitting my new bargain EBC drilled and grooved discs and greenstuff pads all round and see how that does.
Hopefully I will be able to give you some sort of advice on whether it improves braking or not.
It is also designed to fit under 15" wheels as well.
These are the discs and spacers. You also get spigot rings and stainless bolts etc.
The discs are Ford Focus ST170 rear disks machined to fit the pcd of the F/TF.
Fitting was easy
These are some before shots.
And with the wheel removed.
With the old disc removed you can see the difference between the new 280mm and the old standard 240mm.
and you can see the difference in offset between the discs. The new disc is shallower so sits further into the wheel.
With the old disc removed, and the hub cleaned up, the first thing to do is fit the spigot ring. This holds the disc central and stops wheel imbalance at high speed. The spigot ring needs to be fitted with the recess facing the hub.
The next picture shows how the carrier extension block bolts to the hub.
They are handed and the stepped part should face you with the narrow end of the step at the top. We do not fit this yet as we need to bolt it to the carrier.
Fit the disc onto the hub, using the retaining screws, (The supplied screws are shorter and allan headed, but are very soft. I will be cutting my stainless ones to size and using them) bolt the extension block to the caliper and bolt into place.
And with the wheel fitted you can see the difference. Even if it doesn't give better braking I am glad I did it just for the better looks.
For those who like proof and statistics I had them tested before and after the mod. Note, the same pads were used for both and were bedded in for around 60 miles on the new discs. Will probably get better with further bedding in, but I will be fitting Greenstuff pads soon.
I would also like to thank Kwikfit of Ashington for doing the tests for free and allowing me to photograph the results.
So, here are the results
Pre mod
and post mod
as you can see, that is an increase of 60kgf braking force per side, or an increase of rear braking of more than 33%
Also, for those who like pics, here is the before
and here is the after
Well worth it even for the looks, let alone the increase in stopping power.
The coversion was good, but the weak point was using the old standard calipers which aren't brilliant and don't age well. The brake distribution, even between the 2 pads on the same caliper is crap. This is a downside of single pot calipers.
The coversion was good, but the weak point was using the old standard calipers which aren't brilliant and don't age well. The brake distribution, even between the 2 pads on the same caliper is crap. This is a downside of single pot calipers.
When you think about it, those rear "crap" callipers started life in 1984 on the rear of the Rover 800 stirling Yet more of the MGR parts bin special
The only warping on discs I have ever experienced has been due to the disc design/material but I suppose if you pressurise it - in the extreme - on one side only, something's got to give. I am interested in fitting 280s to my car (old 1.8i) - is there any way to improve the 'slide-ability' of the existing caliper?
Also, I have bought a pair of 160 four-pots on fleabay - could you tell me what mods are needed (got 16s)? Does it need a m/cyl change?
The only warping on discs I have ever experienced has been due to the disc design/material but I suppose if you pressurise it - in the extreme - on one side only, something's got to give. I am interested in fitting 280s to my car (old 1.8i) - is there any way to improve the 'slide-ability' of the existing caliper?
Also, I have bought a pair of 160 four-pots on fleabay - could you tell me what mods are needed (got 16s)? Does it need a m/cyl change?
The best and only real way to optimise the rear brake calipers is to keep them maintained 100% with regular stripdown and cleaning.
As far as I know the master cylinder is the same whether you have standard calipers or APs.