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Topic: Brake Imbalance (Read 853 times) |
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
 
Posts: 133
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Brake Imbalance
« on: Jun 24th, 2008, 5:35pm » |
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Scorpio 2.5TD Estate R Reg MOT!! Nearside FRONT brake is 50% weaker than O/S front brake?
I have changed flexible rubber hose. Made No difference.
So I fitted a NEW N/s brake caliper Still made no difference.
Discs are in good shape and pads are nearly new similar wear on both sides. Has anyone any Ideas?
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a900one
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A scorpio is for life not just for christmas
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Re: Brake Imbalance
« Reply #1 on: Jun 24th, 2008, 7:23pm » |
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I think its a split system, so may be master cylinder.
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #2 on: Jun 24th, 2008, 8:50pm » |
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master cylinder has single pipe to ABS system so unlikely.
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #4 on: Jun 24th, 2008, 10:44pm » |
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So does the master cylinder feed the two circuits? or is it this hydraulic unit ?? 97 on as its a '98
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Brake Imbalance
« Reply #5 on: Jun 25th, 2008, 12:11am » |
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2 pipes from the master cylinder on my 2.3, I assume the same for yours.
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ABS multiplug wheel sensor pins MK IV or MK 20
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Snoopy
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Very old.BAD tempered and missing friends.
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Re: Brake Imbalance
« Reply #6 on: Jun 25th, 2008, 7:39am » |
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The picture of the TWO pipes can be seen at no 5 HERE
Its only the ABS unit that changed with the years . its all on the brake manual on the main site
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gozz
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Been around awhile
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Re: Brake Imbalance
« Reply #7 on: Jun 25th, 2008, 9:39am » |
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shooshyneyman.
On my R reg 2.3,the front m/cyl pipe goes to the ABS unit and thence to the rear brakes,the rear m/cyl pipe goes to ABS unit,thence via two pipes to the front brakes.Could yours be the same ? Maybe your problem is being caused by a faulty ABS unit.
GOZZ.
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #8 on: Jun 25th, 2008, 3:08pm » |
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OK I have two pipes from the master cylinder both go to the ABS unit.
Then one set must split to a front wheel and both rears and the other must go to the other front. As I have an imbalance on the two front ones what is controlling the pressure? Master cylinder? or ABS?
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Brake Imbalance
« Reply #9 on: Jun 25th, 2008, 3:15pm » |
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As far as I understand from reading the brake manual, one pipe controls one front wheel and both rears.
The rears are common to both circuits.
That being the case your rear brakes will still get the effort they require from the "working " circuit.
I'm still with the dodgy master cylinder theory 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #10 on: Jun 25th, 2008, 4:17pm » |
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Looking at the pipes on the car, both rears are connected at the back, a single pipe comes forward to the abs where a front wheel pipe goes in. This seems to be fed from the master cylinder. The other pipe from the master cylinder goes to the other side of the ABS and seems to feed the other front wheel. I dont know what is going on in the abs but I feel that the brake pressure is generated in the Master cylinder supporting the idea that this is at fault
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #11 on: Jun 25th, 2008, 5:40pm » |
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On closer Inspection It seems my original premise was wrong, now the manual makes a little more sense. The master cylinder feeds the abs with one pipe which then goes to the rear brakes. The other master cylinder pipe feeds the abs which feeds the two front pipes. The master cylinder seems less likely now. So what is going on in the abs? A crushed pipe came to mind but can find no evidence of that.
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Tompion
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1997 2.3 Ultima estate.
Posts: 2918
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Re: Brake Imbalance
« Reply #12 on: Jun 25th, 2008, 8:39pm » |
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I managed to put one of the spring retaining clips on wrong, it caused excess travel on the pedal, a bit like air in the system. I haven't a clue how it affected the balance, but worth a check they're as shown here:
http://www.fordscorpio.co.uk/manual/brake/FCaliper.pdf
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ABS multiplug wheel sensor pins MK IV or MK 20
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Brake Imbalance
« Reply #13 on: Jun 25th, 2008, 8:43pm » |
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I dont know how the ABS system actually works but i would assume it is passive until actually called into action and has no input into "normal" braking.
Its still screaming master cylinder seals at me 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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gozz
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Re: Brake Imbalance
« Reply #14 on: Jun 25th, 2008, 10:47pm » |
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You could always try swapping the two front pipes on the ABS unit,then test the balance again.That would put the ABS theory to bed.
GOZZ.
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shooshyneman
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3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #15 on: Jun 26th, 2008, 9:47am » |
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Thanks Gozz that seems a good idea. But in his wisdom Mr. Ford has put different size connectors on those pipes. To stop me doing it wrong I presume.! But looking carefully at this
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shooshyneman
Full Member
3 x 2.5TD estates. Then there were no scorpios
Posts: 133
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Re: Brake Imbalance
« Reply #16 on: Jul 2nd, 2008, 12:50pm » |
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Ahh the simple things---- After trying swapping the pipes problem disappeared!
I now think there must have been air in the pipes. After a good bleed problem gone MOT passed till next time.
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