Hammerhead
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| posted on 20/9/06 at 12:11 PM |
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Brakes - anyone using this setup on MK Indy?
I am having problems with my brakes.
My Indy is ready to be dropped on the deck as a rolling chassis. The problem is that I have bought 300mm x 32mm HIgh spec discs and bells. I have
seirra cosworth vented rear discs 273mm x 20mm.
I think that the brakes are overkill, although i havent tried them.
I am stuck with using cosworth spacing on the rear discs, but I was wondering if anyone has the following spec and would tell me if its anygood:
Fronts - 283.0MM DIA 24.0MM THICK
Rears - 273.00MM DIA 10.3MM THICK
And what calipers are you using on the front?
If I make the change I will have for sale 4 brand new 300mm x 32mm hi-spec discs and 2 aluminium bells suitable for a sierra. Along with 2 cosworth
rear vented discs, and 2 std sierra solid rear discs.
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JAG
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| posted on 20/9/06 at 03:37 PM |
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Even your 'new' set up is major over kill in my opinion (and I am an Engineer working for a company that makes and specifies brakes for
mass produced cars).
You don't need a ventilated front disk - I'm assuming they are vented if they're 24 or 32mm thick.
At a push the rear caliper with a 10mm thick solid disk is suitable.
The standard Cortina/Sierra/Escort front brakes (with a solid disk) and an 8" or 9" rear drumbrake are more than capable of stopping any
car, of upto 900Kgs, at 1g.
If it's just a bling thing - well that's your choice but your spending a lot of unnecessary cash 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Hammerhead
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| posted on 20/9/06 at 04:20 PM |
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its not a bling thing, its hobsons choice because the lugs on the rear hub carriers are spaced for cosworth rears. I don't want to take the hub
nuts off and replace with std sierra hub carriers (which I don't have anyway)
So with cosworth rears I have to go bigger at the front otherwise I may aswell drive around in reverse 
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DIY Si
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| posted on 20/9/06 at 04:50 PM |
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Whilst it may be overkill, how can it be bad thing having even bigger, better brakes?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Wadders
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| posted on 20/9/06 at 06:33 PM |
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No you don't, just dial out the rears with an adjustable bias valve. rears on mine are virtually disabled, using wilwoods up front on 10mm solid
discs. Stopping is awesome because the cars are so light.
So with cosworth rears I have to go bigger at the front otherwise I may aswell drive around in reverse
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Wadders
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| posted on 20/9/06 at 06:35 PM |
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All it means is you will lock up quicker, doubt you would stop any faster. I reckon you could lock the fronts even if you used drum brakes, due to the
lightweight nature of the cars.
Originally posted by DIY Si
Whilst it may be overkill, how can it be bad thing having even bigger, better brakes?
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locost@mintynet.com
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| posted on 20/9/06 at 07:07 PM |
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I have a tiger supercat, with 278mm front vented discs and calipers off a 2.9 24v scorpio cosworth and the 273mm rear vented discs and calipers off a
4x4 sierra cosworth. The front discs are the largest discs that I could find without going the expense of using bells etc, I did however have to make
spacers to change the offset on the front caliper. Have a look at my build on http://mintynet.7host.com/supercat.aspx
Ian
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gazza285
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| posted on 20/9/06 at 07:23 PM |
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Braking force is still dependent on how hard you push the pedal, try it first and worry later. If the brakes lock up easy then either increase the
size of the master cylinder or cylinders, or move the pivot point of the cylinder pushrod further away from the pedal pivot. Rear bias can be adjusted
using a valve (cheap option) or with a twin cylinder pedal box (more money). As for the front calipers any of the aftermarket alloy calipers look
nice, or stick with the Cossy stuff if you want, but anything can be made to work with right master cylinder and bias setup.
DO NOT PUT ON KNOB OR BOLLOCKS!
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JAG
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| posted on 21/9/06 at 07:48 AM |
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It can be a bad thing
Most pad materials work best within a specific temperature range. With big ventilated disks they'll never get hot enough to get upto the pads
operating temperature - hence poor decel', poor feel and wooden brakes.
If you fit the Cosworth rear caliper with a solid disk (if you can) then a 240-260mm disc with 57mm bore calipers on the front it will probably work
fine.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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