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Thread: Help needed with brakes

  1. #11
    Site Supporter ProtoTipo's Avatar
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    Re: Help needed with brakes

    If you want to get really nostalgic, it opens in Word as it appeared on the old forum, (less avatars):
    Attached Thumbnails Attached Thumbnails Chris Richard Brakes.jpg  

  2. #12
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    Re: Help needed with brakes

    Small progress report, Changed the front master cylinder to .75 and yes this did make an improvement, so I decided to change the pedal ratio from 3.3 (60/200 mm) to 5.2 (42/218 mm). I thought this would make a bigger improvement, but no really, its still not what I would call super brakes, I am waiting for a set of Ferodo DS2500 brake pads to arrive and that may help. When I compare my Stratos brakes to what I have in a standard Vauxhall Nova GSI with Mintex 1144 pads its chalk and cheese

  3. #13
    SEC Member ChrisCar6's Avatar
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    Re: Help needed with brakes

    With the higher pedal ratio, can you reduce the M/C size further?

  4. #14
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    Re: Help needed with brakes

    Hi Chris,
    I changed to 0625 front and 075 rear and I really expeceted this to work but no, (I genuinely could not lock the brakes at 20 mph on a wet road).Its like the rear brake is stopping the front cylinder working because the pedal is so stiff, so hours later I changed the rear to .7 and finally the front brakes are now working but I have a long pedal travel So I then changed the front again to .7 (Now back and front) and no not happy with this, so best combination so far but not happy is .7 rear and .625 front.
    I am now thinking of changing the calipers to ones with a smaller piston size. or am I really missing something here ?

  5. #15
    SEC Member Strat Fan's Avatar
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    Re: Help needed with brakes

    If you have a Litton does it not have the Tilton pedal box fitted?
    For an unservoed braking system I really feel that you need fixed body calipers with multiple small pistons to maximise pedal feel and efficiency.
    If you are sticking with the floating single piston calipers then I really think you will need to have a brake servo fitted to make the brakes work as you want.
    See HERE for a unit which would satisfy both the front and rear circuits. Whist it isn't cheap it would still be much cheaper than new 4 pot calipers and wouldn't cause you any issues with wheel clearances.

    For reference here are a few pictures of Corse "S" cars with 4 pot brakes fitted-
    Click image for larger version. 

Name:	Custom caliper mount ver 2.jpg 
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ID:	15449Click image for larger version. 

Name:	Front suspension LH with new rack boot.jpg 
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ID:	15450Click image for larger version. 

Name:	New 300mm brake disc.jpg 
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ID:	15451
    And another with Wilwood calipers-
    Click image for larger version. 

Name:	Wilwood Front Brake Disc.jpg 
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ID:	15452
    Last edited by Strat Fan; 09-09-2019 at 15:22.
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  6. #16
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    Re: Help needed with brakes

    Thank you, yes I have a Litton and it did not have a Tilton pedal box fitted and correct I do not have a servo.
    The Hi Spec brakes that you have in the photo would you know the dimension from the disc to the outer part of the caliper ? I did contact Hi Spec but they never replied.
    Thank you
    Gerard

  7. #17
    SEC Member Strat Fan's Avatar
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    Re: Help needed with brakes

    According to the HiSpec drawing I have it as being 49.5mm from the disc face to the outer face of the caliper.
    Click image for larger version. 

Name:	Corse Front Brakes.png 
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ID:	15453
    The PDF of the Billet 4 caliper can be seen here- B4-310-radial.pdf
    We fitted the set up shown under 16" wheels but with care they should fit under 15"
    Last edited by Strat Fan; 09-09-2019 at 20:02.
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  8. #18
    SEC Member Paul Eustace's Avatar
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    Re: Help needed with brakes

    I remember printing all the HiSpec drawing and making lots of sketches.
    You maybe interested in looking at page 8 of this thread started by my son Michael.Litton Corse build with 2.0l Lancia 8v TC

    I have HiSpec front and rear 4 pot calipers with 300mm vented rotors and custom bells on my Litton using 15" wheels. They really work. I used a 5/8" front master cylinder and a 13/16" rear master cylinder. As Tim mentioned earlier in the thread, having the balance bar parallel to the axle line when braking results in great brake pedal feel.
    I used HiSpec offset caliper mounts to attain good caliper alignment.
    The HiSpec sales guy was very helpful on the phone but email is not the best way to deal with them.....

  9. #19
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    Re: Help needed with brakes

    Thank you Paul and Tim,
    Had a look at it again last night and I recon I will change to a Subaru disc which will put the disc in another 12mm and if I machine the hub I should be able to safely machine another 5mm off it which at that point I will be getting close to been able to fit four pot calipers.
    Unless anyone else know of a brake disc which has a greater height than the Subaru which are 57mm unless I go for the rear ones which are 67mm high, but are only available in 20mm thickness
    Or maybe I should look at some custom bells which probably be the easiest way !

  10. #20
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    Re: Help needed with brakes

    I used a HiSpec 300 x 22mm off the shelf disc and one of their universal disc bells to move the caliper and disc as far inboard as possible to give maximum wheel clearance.
    I think I did skim a little off of the aluminium hub but can't remember exactly now.
    On the rear I used a standard Alfa 156 (front 285 x 22mm) vented brake disc as caliper clearance wasn't an issue with the Gp4 rear wheel.
    "You can lead a horse to water, but a pencil must be lead"
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