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Author Brake bias
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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7th Sep 11 at 20:04   View Garage View User's Profile U2U Member Reply With Quote

Been reading a bit into this, clearly its a complicated affair setting up a proper rear bias, and ideally should be done with measuring equipment.

To add to the complications my stock master cylinder has the bias done courtesy of the master cylinder, quote from TIS

quote:
Vehicles fitted with the standard braking system have pressure conscious reducing valves (PCRVs) fitted in the master cylinder outlet ports. The PCRVs control the hydraulic pressure applied to the rear brakes reducing the risk of rear wheel lock-up under braking.


Reading this article

http://www.stoptech.com/tech_info/wp_proportioning_valves.shtml

Suggests that sticking a proportioning inline with a stock bias system already in place is a big no no and can produce unpredictable results, tbh this was my thoughts anyway.

Also it points out that putting better brakes on the front will increase front bias and removing weight out the back increases rear bias.

Taking into account it also advises where possible to just leave the stock system as is, is it worth just leaving it judging by iv altered biases front and rear and potentially have just evened each other out?

If i do stick a rear bias valve in, is there an easier way to get it roughly right?

PS 3rd party tandem master cylinder not an option at the moment, thats a plan for the future so no suggestions about that please
mwg
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Registered: 19th Feb 04
Location: South Lakes
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7th Sep 11 at 20:07   View User's Profile U2U Member Reply With Quote

Dont mean to be rude mate but how often are you actually using this car on track to bother with half this stuff
Steve
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Registered: 30th Mar 02
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7th Sep 11 at 20:09   View Garage View User's Profile U2U Member Reply With Quote

adjusting the rear bias is vital for all situations, not just on track, otherwise why would manufacturers need to adjust it just for road cars.

as i have fitted the larger front brakes and taken all the weight out the rear its pretty important it gets set correctly regardless, it affess ALL braking situations
Jake
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7th Sep 11 at 20:09   View User's Profile U2U Member Reply With Quote

the answer is..


sometimes
mwg
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7th Sep 11 at 20:10   View User's Profile U2U Member Reply With Quote

so if you hadn't bothered taking all the weight out the rear you wouldn't be in this situation
Steve
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7th Sep 11 at 20:12   View Garage View User's Profile U2U Member Reply With Quote

this isnt really helpful to my problem matthew
Jon_C
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Registered: 7th Dec 05
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7th Sep 11 at 20:12   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by mwg
so if you hadn't bothered taking all the weight out the rear you wouldn't be in this situation


Boy likes making work for himself.
Steve
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Registered: 30th Mar 02
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7th Sep 11 at 20:14   View Garage View User's Profile U2U Member Reply With Quote

anyone got any useful info with regards to my first post ?
smcGSI16V
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Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
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7th Sep 11 at 20:16   View User's Profile U2U Member Reply With Quote

stfu.
Jake
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7th Sep 11 at 20:18   View User's Profile U2U Member Reply With Quote

take it somewhere proper to get set up. its just as important as steering geometry and that isnt something you try and wing on your driveway
Steve
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Registered: 30th Mar 02
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7th Sep 11 at 20:19   View Garage View User's Profile U2U Member Reply With Quote

yeah i think you may be right jake loxham of milton keynes
tom_simes
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Organiser: South Wales
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Registered: 12th Jan 05
Location: Undy, Newport Drives: Skoda Octavia vRS estate
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7th Sep 11 at 20:19   View Garage View User's Profile U2U Member Reply With Quote

I suggest you fit a 3rd party tandem master cylinder, that should help.
Steve
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7th Sep 11 at 20:21   View Garage View User's Profile U2U Member Reply With Quote

thats where it will go eventually, but its a bit of a faff as will need new brackets etc welding in
smcGSI16V
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Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
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7th Sep 11 at 20:22   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Steve

Taking into account it also advises where possible to just leave the stock system as is, is it worth just leaving it judging by iv altered biases front and rear and potentially have just evened each other out?



answered your question.

Leave it as it is.

All your doing is confusing the issue, over thinking and blowing your small mind.

Do you want a fight, bearing in mind I have a skin head and you will lose?
Steve
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7th Sep 11 at 20:23   View Garage View User's Profile U2U Member Reply With Quote

well up for that

i think leaving it is a good idea until i have a suitable MC

then doing what jake said and take it somewhere to get setup

[Edited on 07-09-2011 by Steve]
smcGSI16V
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Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
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7th Sep 11 at 20:28   View User's Profile U2U Member Reply With Quote

Yes. Tbh unless you are changing to complete sperate system and ditching the oe mc and changing to pedal box seperate resoviours for front and rear, then I would worry about rear brake bias, but whilst it's done for you in the existing mc; or like a corsa with a rear brake proportioning valve thingy it's pretty pointless.
Jake
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7th Sep 11 at 20:30   View User's Profile U2U Member Reply With Quote

if steve also shaved his head it would be evenly matched though
smcGSI16V
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Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
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7th Sep 11 at 20:34   View User's Profile U2U Member Reply With Quote

But I am more man than him and have more meat so he would still lose.
Gary
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7th Sep 11 at 20:42   View Garage View User's Profile U2U Member Reply With Quote

You would really get along with a mate of mine, he'll obsess over everything he reads.
AndyCorsaSport
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Location: Horsforth, West Yorkshire
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7th Sep 11 at 20:56   View User's Profile U2U Member Reply With Quote

Just cut a hole in the wheel arch so you can put you foot on the wheel like you did as a kid on your bike
Rob B
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Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
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8th Sep 11 at 00:10   View User's Profile U2U Member Reply With Quote

Me and Ollie both agree you should use the bloody thing!

FlaFFy_91
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Registered: 30th Sep 08
Location: Formby, Merseyside
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8th Sep 11 at 01:50   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Steve
anyone got any useful info with regards to my first post ?


haha steve the irony of this sentance comeing from you
IvIarkgraham
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Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
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8th Sep 11 at 07:23   View Garage View User's Profile U2U Member Reply With Quote

chuck an anchor out the window
mwg
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Registered: 19th Feb 04
Location: South Lakes
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8th Sep 11 at 08:37   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jon_C
quote:
Originally posted by mwg
so if you hadn't bothered taking all the weight out the rear you wouldn't be in this situation


Boy likes making work for himself.


Yep. Stripped the interior of the car which has ended up creating more problems like this and also the fact its now unbearable to use on a daily basis but he won't admit that to us. Kicking himself that he went to the tip with all the interior now and secretly wishes he could put it back in
John
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8th Sep 11 at 08:44   View User's Profile U2U Member Reply With Quote

Will be really good for driving round a tiny bit of Germany once a year though

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