Gen4 ATR brake upgrade enquiries..

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Apr 09, 2014 8:47 am

Just wondering about the upgrade to ATR twin-pot brake calipers.

1. Can they be taken from any ATR, or a specific model/year?

2. Is it fronts and rears, or just fronts we require?

3. Are there any modifications that need to be done to make them fit?

4. Do you need to change the discs/hoses as well?

5. How much would one expect to pay approximately, to acquire all the parts required for the conversion (£min-£max)?

6. Are there any other points to consider?

Thanks.

JMBW · Post by **JMBW** » Wed Apr 09, 2014 9:20 am

I just bought and fitted ATR brakes on my 5G BB6.

1: Really don't think there is more than one ATR brake type/configuration; someone else might know otherwise
2: I just opted for just front calipers, as this is where the real braking performance is needed.
3: They went straight on my BB6, the brake disc guard shield might need some bending/moulding to stop rubbing on the discs

4: You need ATR discs, but the Prelude brake lines fit the ATR calipers
5: My cost was 140£ + postage for: Good condition calipers + reasonable condition discs (ca. 1mm from minimal thickness) and almost new pads.
6: Refurbish the calipers if the pistons/gliders don't glide smoothly + bleed your brakes well after fitment + You most likely wont be able to run 15" wheels, but most 16" and bigger will fit around the new size caliper

And then just enjoy your much improved braking performance - it's well worth the £££

JMBW · Post by **JMBW** » Wed Apr 09, 2014 9:23 am

Now you just need someone to confirm that the 4G and 5G spindels/hubs are the same

Post by **indigolemon** » Wed Apr 09, 2014 10:07 am

If you want to use them on a 4th, you have two choices:

1 - Use the ATR Carriers/Calipers and get the discs redrilled for 4 stud
2 - Use the ATR Calipers with prelude Carriers and keep the prelude discs

I chose option 2, as I needed them to fit under my 16" alloys, works great, but there is a bit more pedal travel due to the thinner disc. Once they bite they're brutal though!

Post by **Vtecmec** » Wed Apr 09, 2014 10:22 am

indigolemon wrote:I chose option 2, as I needed them to fit under my 16" alloys, works great, but there is a bit more pedal travel due to the thinner disc. Once they bite they're brutal though!

Can you make an adjustment at the pedal to cancel out the disc thickness?

JMBW · Post by **JMBW** » Wed Apr 09, 2014 10:35 am

Then I would definitely go for indigolemon's option 1, the difference between the two discs is huge.

I wish I took a picture of the two discs together

The 23mmx282mm standard discs look dinky compared to the 28mmx300mm ATR discs and the difference in heat absorption and brake capability is very noticeable whit the ATR discs.

They handle my spiri*ed driving style effortlessly

Post by **RattyMcClelland** » Wed Apr 09, 2014 10:36 am

Also I'm running 16s with the bigger discs and they are fine. Even 15 should clear.

Ek9, dc2, prelude and Atr all use the same pads.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Apr 09, 2014 10:41 am

CrunchyAdams82 wrote:Just wondering about the upgrade to ATR twin-pot brake calipers.

1. Can they be taken from any ATR, or a specific model/year?
- there is only one model of ATR sold in the UK

2. Is it fronts and rears, or just fronts we require?
- fronts

3. Are there any modifications that need to be done to make them fit?
- calipers bolt straight onto standard prelude carriers, with standard prelude discs
- or you can fit larger 300mm discs and use the atr carriers (which bolt straight onto the standard prelude hub)

4. Do you need to change the discs/hoses as well?
- no need to change hoses, you can upgrade the disc size to 300mm (from 282mm)

5. How much would one expect to pay approximately, to acquire all the parts required for the conversion (£min-£max)?
- calipers and carriers (used) around £150?
- discs you can buy 300mm 5-stud discs for around £60 I think and then either re-drill them to 4-stud yourself, or pay someone to re-drill them to 4-stud for you, or m-tec will supply them pre-drilled to the 4-stud studs pattern for a small extra charge
I need to get a set of 300mm discs for Lisa's and want to get them pre-drilled so I don't have any extra hassles myself and have no worries about balancing of the discs etc. SO IF YOU WANT TO GO FOR THIS, LET ME KNOW AND I'LL SET UP A GROUP BUY OF THEM

6. Are there any other points to consider?
- nitin is sexy?
- (ok seriously though, if you buy used calipers, you may want to re-furb them before fitting, so factor in the cost of a re-furb kit from big red or brakes international too)

Thanks.
- welcome x

Post by **indigolemon** » Wed Apr 09, 2014 10:46 am

Vtecmec wrote:
indigolemon wrote:I chose option 2, as I needed them to fit under my 16" alloys, works great, but there is a bit more pedal travel due to the thinner disc. Once they bite they're brutal though!
Can you make an adjustment at the pedal to cancel out the disc thickness?

That's a thought, never looked into it. I'd assume that would affect the rears too though?

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Apr 09, 2014 10:55 am

Excellent. Thanks for your help guys.

Next few questions then..

7. Are there not 28mm x 300mm discs on the market that come with a 4 stud fitment ready to go?

8. Would it be beneficial to go for some decent drilled & grooved discs, or are the ATR ones good enough? (I know the comparison between 1 pot & 2 pot will be huge anyway, I just figured if you're already spending the money..might be worth spending a little more..)

9. Would EBC 'Green Stuff' pads be a good choice for street use, or does somebody have a better idea?

Ta very much.