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Author Brake bias boxes
Stu_22
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Registered: 25th Mar 02
Location: Luton
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14th Jun 17 at 09:27   View User's Profile U2U Member Reply With Quote
Anyone here that still has a corsa or had a corsa with the brake bias box instead of brake servo?

I have replaced the servo assisted brake master cylinder on mine with the twin cylinder bias box but so far not impressed. the pedal feels solid and the calipers and Pads(hi-spec green stuff) were good on old servo set up. Now it takes a lot of effort just to get the car to slow let alone be at any point for the car to lock its brakes. I have tried adjusting it more to the front but that resulted in the brakes locking up.

Any suggestions
johnny86
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Registered: 15th Feb 10
Location: in a bus stop.
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15th Jun 17 at 15:38   View Garage View User's Profile U2U Member Reply With Quote
I had a set up simular to this I hated it.. I had ap front brakes rear disc conversion and it felt like the car didn't wanna stop.. pedal was hard as fuck
gazza808
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Registered: 30th Jun 08
Location: Peterborough
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20th Jun 17 at 07:47   View User's Profile U2U Member Reply With Quote
you need to redrill the pivot point where the bias box connects to the pedal.

to increase the ratio so you get more leverage from when you press the pedal, giving a softer pedal.

had the same issue
tom130691
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Registered: 13th Sep 08
Location: Daventry
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20th Jun 17 at 11:54   View Garage View User's Profile U2U Member Reply With Quote
sounds like driving my old mini
Col004
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Registered: 25th Jun 03
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20th Jun 17 at 18:32   View User's Profile U2U Member Reply With Quote
I have one... I've not drove it yet as I'm far too lazy to finish the car

I have modded the pedal arm as stated above. The reason I've gone down this route is because I have driven one (with the pedal arm mod) and it felt great with a good calliper setup.

[Edited on 20-06-2017 by Col004]
Stu_22
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Registered: 25th Mar 02
Location: Luton
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20th Jun 17 at 19:07   View User's Profile U2U Member Reply With Quote
col please could you get me a pic of this mod. I bought the pedal box already attached to a pedal so not sure if its been done
Stu_22
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Registered: 25th Mar 02
Location: Luton
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21st Jun 17 at 09:08   View User's Profile U2U Member Reply With Quote
Found this
http://www.migweb.co.uk/forums#/topics/414938?page=5

Just got to hope it hasn't been done already
Stu_22
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Registered: 25th Mar 02
Location: Luton
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21st Jun 17 at 21:36   View User's Profile U2U Member Reply With Quote
So here is my brake pedal

Not much room to move the hole up
Col004
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Registered: 25th Jun 03
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26th Jun 17 at 11:18   View User's Profile U2U Member Reply With Quote
Sorry mate... Just seen this. I'll get you pictures this week when I'm in the garage.
Stu_22
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Registered: 25th Mar 02
Location: Luton
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26th Jun 17 at 18:58   View User's Profile U2U Member Reply With Quote
Thanks hope it looks like this
Stu_22
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Registered: 25th Mar 02
Location: Luton
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26th Jun 17 at 18:58   View User's Profile U2U Member Reply With Quote
Standard left new pivot hole right
Novaneil
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Registered: 26th Oct 06
Location: Leamington Spa
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29th Jun 17 at 11:41   View User's Profile U2U Member Reply With Quote
what size master cylinders are you using front and rear on your pedal box?

I've got the same setup, but with Reyland (AP) calipers front and rear discs with the revised pivot point and its also has rubbish feel
Stu_22
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Registered: 25th Mar 02
Location: Luton
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29th Jun 17 at 13:47   View User's Profile U2U Member Reply With Quote
0.625 front with hi spec 4 pot calipers. 0.75 rear stock shoes

Haven't had a chance to test new pedal

[Edited on 29-06-2017 by Stu_22]
Stu_22
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Registered: 25th Mar 02
Location: Luton
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2nd Jul 17 at 19:18   View User's Profile U2U Member Reply With Quote
finally got round to testing it today. Front brakes stuck on again but managed to free after putting in a bit more play on the master cylinder
So I have a bit more breaking performance but pedal feels a bit soft.
basslinecorsa
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Registered: 15th Jul 09
Location: Gravesend
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7th Jul 17 at 14:01   View Garage View User's Profile U2U Member Reply With Quote
A proper set up should be as follows:

0.625" master to the front
0.750" to the rear

Pedal ratio is normally 5.5:1 or 6:1
(yours appears to currently be closer to 9:1 !!!)

Set up the balance bar so that it is level (90 deg to the push rod) when the brakes are applied fully. To do this you will need to shorten the push rod going into the rear (0.750") master cylinder. This step is very important to give you a good pedal feel and is the most likely step to be ignored.

Next put the bias all the way to the front, go out and stand on the brakes as hard as you can. You will find that the front should lock very easily. Wind the bias towards the rear and test again. Keep going until the rear brakes dig in and keep the vehicle braking in a straight line. Do this with nice warm brakes in the dry.

*If you are using it hard in the wet, the bias will need to go to the front more to stop the rears from locking first.*

Project Scarlett - http://www.corsasport.co.uk/board/viewthread.php?tid=661417

 
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