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Author Subject: Removing ABS/ Biasing is driving me nuts
chris with a pug

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Location: Southampton

Registered: 16 Feb 2003

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Post #1
Right here goes: have been looking a ways to remve the ABS and rear compensator thing, and have come across a few problems.
I am ok with theory behind the duel curcuit braking system so understand that I wll need two t conectors to distribute the two master cylinder feeds, now my problem is how will I bias the system. I cant seem to find and duel curcuit Bias valves, do they exsist or would I have to buy two and make sure they are set the same?
Also I am asuming the biasing at the moment is done by the ABS pump is that right? or is it all done by the compensator.
If this sound stupid I am sorry but I am runnig out of hair to pull out
Posted 10th Sep 2008 at 15:49
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #2
nope they don;t exist, you need to remove the line from one port of the MC and blank it off, and feed the rear brakes off a single line via the bias valve.

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Posted 10th Sep 2008 at 16:14
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chris with a pug

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Post #3
Will the MC be able to cope?
Posted 10th Sep 2008 at 18:44
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puglover Banned!

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Post #4
you might want to look into the insurance side of things there chris, most insurance companies really don't approve.
Posted 10th Sep 2008 at 23:08
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chris with a pug

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Post #5
I am not really bothered about that, the car not exsactly standard when it is finished, plus the 306 did come with out abs so shouldnt be too bad, but would like to keep it if I can
Posted 11th Sep 2008 at 00:24
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kman1600

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Location: Eglinton

Registered: 13 Feb 2007

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Post #6
Hi,

I removed the ABS from my ZX 2.0L 16v (pretty much a 306 in different cloths), this is well worth doing for a track car and the pump weighs almost as much as a battery and it's very poorly placed for weight balance.

The ABS doesn't do any balancing of the breaking force, well not on the ZX anyway. I just used one half of the master cylinder to the front brakes (back outlet)and another to the back, on the ZX there are only two outlets.

If you simply do this you'll find that the rear brakes are too strong in some conditions so typically the solution is a pressure limiting valve that stops the pressure at the rear brakes going above some predetermined
Posted 11th Sep 2008 at 00:26
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puglover Banned!

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Post #7
ive got an abs unit here in my hand it weighs 2kg. My battery weighs 15kg
Posted 11th Sep 2008 at 00:44
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kman1600

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Location: Eglinton

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Post #8
Hi,

Can't argue with your weight assessment as it went to the skip a long time ago!!! Last car part I had reason to weigh was an inlet cam and that was pretty much 2kgs, seem to remember the ABS pump being heaver than that, mind playing games with me I guess.

If you want to enter into a p*ssing contest my battery weighs 6.1kgs Wink

Still an essential item to remove on a track car!!!

Tim
Posted 11th Sep 2008 at 00:59
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chris with a pug

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Post #9
My pump is well heavy, a lot heavier than 2 kg I recon,

So could I use a manual bias valve to control the rears or would I need to get a load of those presure regulators you mentioned and have aplay with values
Posted 11th Sep 2008 at 03:03
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midlife

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Location: Colne, Lancashire

Registered: 13 Mar 2006

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Post #10
There are always plenty of bias valves on ebay, they generally sell for around the

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Posted 11th Sep 2008 at 05:35
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Carl Chambers

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Post #11
Why not just get a master cylinder of a non abs model with 4 outlets?

________________________________________

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email; pugnacious.peugeot@yahoo.co.uk
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Posted 11th Sep 2008 at 13:54
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chris with a pug

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Post #12
midlife wrote:
There are always plenty of bias valves on ebay, they generally sell for around the
Posted 11th Sep 2008 at 17:30
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kman1600

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Post #13
Hi,

These valves are not strictly speaking bias control valves they simply allow you to alter the maximum pressure setting for the rear brakes. Depending on the load in the car, the surface conditions etc
Posted 11th Sep 2008 at 18:43
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fbmmart

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Location: Brixham

Registered: 05 Dec 2007

Posts: 99

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Post #14
Just for reference, I had an assignment on ABS systems a while back. In the Bosch Bible it says the system fitted to the 306 weighs in at 7kg total.
Posted 1st Oct 2010 at 02:50
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midlife

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Post #15
Holy thread resurrection BatmanUnsure

Cool

________________________________________

Get used to seeing the yellow one !!!MehMehMehMehMeh
Team 330™Cool
Team "no front end or engine"
Team "LIMITED EDITION" I live for the 306 stickerSmug
Team 0-60 in 6.44 & standing qtr in 14.808 @ 94.55mph all with std engineSmug
203bhp Corolla T-Sport daily driver stealthier than Kwai Chang Caine
Posted 1st Oct 2010 at 03:00
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #16
indeed, though thanks for the info!

that's one thing I'll keep, and still be lighter than most 306's Ninja

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 1st Oct 2010 at 03:07
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braymond

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Location: Brighton

Registered: 20 Aug 2008

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Post #17
midlife wrote:
Holy thread resurrection BatmanUnsure

Cool


Laugh my ass off

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Nurburgring article
Posted 1st Oct 2010 at 16:14
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rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

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Post #18
abs is for chimps

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Posted 1st Oct 2010 at 18:55
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joevts

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Location: barnsley

Registered: 21 May 2008

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Post #19
rikky wrote:
abs is for chimps


+1

i'd take mine off but i can't be arsed with all this hassle. couldn't you just disconnect the inlet and outlet lines from the ABS unit and connect them straight together? leaving the original compensator in place?
Posted 3rd Oct 2010 at 23:26
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #20
yup, as long as its not a phase 3.

that's how non abs cars are anyway, they use the same 2 port m/c's and a t-piece in both lines, NOT a 4 port m/c.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 3rd Oct 2010 at 23:33
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joevts

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Location: barnsley

Registered: 21 May 2008

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Post #21
well mines a 99 T reg xsara so i'm not sure what phase of 6 that equates to. tbh i never noticed it was a 2 port MC, only noticed there were 4 lines going in and out of the ABS block with their respective corners marked in french.
Posted 4th Oct 2010 at 00:11
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