Charlie_Zetec
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| posted on 18/6/13 at 10:38 AM |
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Willwood brake upgrade Q
Morning all,
Back after a quiet time away - house renovations taking over again! I treated myself to a new OBP pedal box not too long ago, and am about to fit it
to the car - but I've got the "shiny" bug again and am going to upgrade the front callipers on the car too. I'm currently
running Sierra front hubs with vented disk setup (solid rear disks), but I'd like to change to a set of Wilwoods or similar on the front.
Wheels are 15" Team Dynamics, so space shouldn't be an issue.
Firstly, I've noticed that there are different models to suit Sierra hubs; minilite, midilite, powerlite etc., so which ones are regarded as the
best or most suitable?
Reading reviews, I see that most people recommend the Mintex M1144 pads to suit as well. Any other options?
The M/C's I have are 0.7 (rear) and 0.625 (front) - will these determine calliper size or be suitable for an off-the-shelf setup?
Are there any other brake suppliers (eg. Hi-Spec) that I should consider?
Where's the best place to buy the full setup? I've seen an advert on eBay, but know Rally Design and Burton also sell the parts.
Anything else that I may have forgotten?!?
Sorry for all the questions, I just want to make sure I get all the right parts first time round!
Charles
PS - as and when I change bits over, I'll have a set of XL-Recon Sierra front callipers, new pads and vented disks (all parts 12 months old, but
only used on rolling chassis on the driveway) with early Fiesta M/C, reservoir and float sensor to get rid of if anyone's interested? Can
provide copies of receipts in the sale as well, for those needing for IVA or DVLA!
[Edited on 18/6/13 by Charlie_Zetec]
Artificial intelligence is no match for natural stupidity!
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britishtrident
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| posted on 18/6/13 at 11:07 AM |
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You need to choose callipers that have the similar or slightly larger effective hydraulic area than the standard 54mm dia Callipers fitted to
Sierra with vented discs.
The Sierra calliper has an effective hydraulic area of approx 2,300 mm^2.
With a 4 pot alloy calliper workout the area of one piston and mutlply by 2
With a 6 pot alloy calliper workout the area of one piston and mutlply by 3
Fitting fancy callipers only reduces the unsprung weight and increases bling -- the braking is not likely to improve and you may end up with
spongey pedal due to calliper flexing or trapped air.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mazie
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| posted on 18/6/13 at 11:41 AM |
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I'm using powerlite's, these don't have dust seals where as the midilite do, they are slightly smaller and weight just 1kg each. I
clean my regularly so it's not a problem. Wildwood recommended the maximum car weight for the powerlites is 800kg, I'm sure that's
what was printed on the box. There is a load of info about the differences and lug fitment type. Ben Copeland on hear got me the kit from from rally
design at a discount so have a word.
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britishtrident
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| posted on 18/6/13 at 12:28 PM |
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The problem with callipers without dust seals is corrosion, even proper production production tintop alloy callipers are very prone to seizing solid
with corrosion.
One of the side effects of a Seven chassis is because of confined dimensions of the drivers foot well and low scuttle height don't allow for
a decent pedal leverage ratio. A lot of Locost style chassis only have a pedal leverage ration of 4 or 5 to 1, ISTR the Sierra pedal leverage
ratio is around 12:1 and it has fairly powerful servo assistance.
For these reasons to Locost/Seven style cars may need front brake callipers with a larger effective hydraulic area than their weight might suggest.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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big-vee-twin
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| posted on 18/6/13 at 01:06 PM |
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Rally Design are the European agents for Wilwood Burton and the rest get them from Rally Design, they even use the RD part numbers.
I have the same master cylinder as yours and have the Powerlite calipers, came part of a Cortina Powerlite Kit.
Best thing to do is buy the Powerlite Kit.
The discs are a size particular to Wilwood and other discs are not compatible (well I didn't find any after hours of searching).
You also need mounting brackets and spacers.
I recently changed from Cortina to Sierra uprights (long story, thanks to British Trident for advice) the brackets themselves for mounting the caliper
are £50, I then had to have some spacers machined to mount the caliper the correct distance from the hub centre.
It is much easier to buy the kit and then you know you have all the necessary parts.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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