Anyone upgrade to the "race" rear brake caliper setup?

17 posts / 0 new
Last post
KnifeySpoony
Offline
Last seen: 5 hours 3 min ago
Joined: 29/01/2022
Anyone upgrade to the "race" rear brake caliper setup?

My car is mostly a track car, I really only drive it to/from the track. I had considered this upgrade for maximum performance during my 420R build last year, but decided to see how the stock setup was. I found it a little over-braked in the front, but upgrading the rear pads to DS3000 has pushed the bias rearward enough that I am happy with the braking performance. However given my recent issues with interference between my rear calipers and watts linkage arms (https://www.caterhamlotus7.club/forum/techtalk/rear-brake-caliper-contacting-radius-armwatts-link), I am thinking about this upgrade yet again. Presumably the lower profile rear calipers won't have any interference issues. I'm OK with the handbrake delete (I'm in the US and in my state the car will never be inspected again). This setup seems to need a proportioning valve, although my calculations of brake bias don't seem to suggest the bias moves all that far rearward compared to the standard setup. 

I'm wondering if anyone has done this upgrade, or driven one of the R300/420R race cars with this setup and can comment on performance. I have never plumbed brake lines, and I would have to get the appropriated line flaring tools etc, but it seems not too difficult to learn. Also I would need to decide on a cockpit-mounted prop valve vs one in the engine bay (much easier to install). Wondering if the easy adjustability is really necessary, as I won't racing in the race.

 

KnifeySpoony
Offline
Last seen: 5 hours 3 min ago
Joined: 29/01/2022

Really, nobody?

420R

Jonathan Kay
Jonathan Kay's picture
Offline
Last seen: 59 min 48 sec ago
Joined: 17/04/2014

I can't find anything in the archives. Are they referred to by another name?

Jonathan

KnifeySpoony
Offline
Last seen: 5 hours 3 min ago
Joined: 29/01/2022

I guess CC refers to them as "uprated" brakes.

 

https://caterhamparts.co.uk/calipers-pads-discs/2976-rear-brake-upgrade-kit-race-only-no-handbrake.html?search_query=brake+pad&results=251

420R

21jigsaw
21jigsaw's picture
Online
Last seen: 8 min 15 sec ago
Joined: 17/04/2014

I have the earlier version  of solid discs and ap racing calipers and a spot handbrake caliper(mot compliant once a year!!!). The earlier version was developed on Vauxhall race cars running slicks they then changed to vented discs (front vented disc on the rear) for a performance improvement( wear or retardation??).  I run it on my 21 which is 695 kgs which is enclosed due to the bodywork and runs around 400deg c . I intend to upgrade to vented discs due to high pad wear on the existing setup. If you change you will need new uprated hubs, ears, caliper spacers, calipers, disc spacer, specific rear discs ( as front but bigger internal dia) and if you wish to run on the road a mechanical handbrake caliper / mounting. The rear track will increase by approx 25mm. Hope this helps. Dave

Jonathan Kay
Jonathan Kay's picture
Offline
Last seen: 59 min 48 sec ago
Joined: 17/04/2014

Thanks: searching the archives for uprated + rear + brake gives;

https://duckduckgo.com/?q=site:caterhamlotus7.club+uprated+rear+brake

Jonathan

KnifeySpoony
Offline
Last seen: 5 hours 3 min ago
Joined: 29/01/2022

Hmm interesting that it increases the rear track by so much. I wonder if that would affect handling balance enough to require change in other setup.

420R

Geoff Brown
Geoff Brown's picture
Offline
Last seen: 21 hours 24 min ago
Joined: 17/04/2014

I do believe that upgrading to the rear race calipers requires an upgraded hub as well........

REAR HUB UPRATED BRAKES ONLY - Caterham Parts

aerobod
aerobod's picture
Offline
Last seen: 47 min 20 sec ago
Joined: 17/04/2014

Looks like the kit from Caterham includes the upgraded hubs, together with the adapters to modify the race ear caliper mounting points: https://caterhamparts.co.uk/calipers-pads-discs/2976-rear-brake-upgrade-kit-race-only-no-handbrake.html?search_query=brake+pad&results=251

James

mic
mic's picture
Offline
Last seen: 10 hours 27 min ago
Joined: 17/04/2014

You will have to fit new ears also.  The mounting for the caliper plate is totally different.

KnifeySpoony
Offline
Last seen: 5 hours 3 min ago
Joined: 29/01/2022

Yes, the whole assembly lateral to the DeDion tube changes with this setup. I just didn't realize that the track changed so much. I already get some tire rubbing on my rear wings, so I'm not sure how things will all fit if that track width change is indeed a thing.

420R