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Brake compensator spring
#1533976
15/04/2015 19:20
15/04/2015 19:20
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woodvurm
Unregistered
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woodvurm
Unregistered
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Been overhauling my old coupe recently and along with CuNiFe pipes all round and the rear compensator that was almost a solid lump of rust.
Doh no spring with the comp and not available through fiat, had read as such on here in a post from way back.
Anyone found a supplier already ?
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Re: Brake compensator spring
[Re: ]
#1533984
15/04/2015 19:39
15/04/2015 19:39
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woodvurm
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woodvurm
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Thanks Joe, which dealership did you get them from ?
My local for south west is Vospers and they said no longer available from Fiat or Alfa ?
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Re: Brake compensator spring
[Re: ]
#1534000
15/04/2015 21:46
15/04/2015 21:46
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woodvurm
Unregistered
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woodvurm
Unregistered
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Yea tried Steve said he had them on back order for 6 months now so he wasn't even sure if they would ever come...
I have contacted an automotive spring company, given them dimensions, coil numbers and photos which has been passed to their tech department.
I will ring the dealer in Hereford in the morning maybe they just have a few left in stock ?
Last edited by woodvurm; 15/04/2015 21:53.
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Re: Brake compensator spring
[Re: ]
#1534010
15/04/2015 22:46
15/04/2015 22:46
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Joined: Sep 2006
Posts: 17,227 FCSS 01684 593187
Countrycruising
Club Rep Europe, member 914
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Club Rep Europe, member 914
Forum veteran
Joined: Sep 2006
Posts: 17,227
FCSS 01684 593187
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Yes give Hereford a try, part number 46438681. If they have no joy ( ie I bought the last two ) let me know and I'll ask my suppliers in Europe.
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Re: Brake compensator spring
[Re: ]
#1534315
18/04/2015 16:17
18/04/2015 16:17
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woodvurm
Unregistered
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woodvurm
Unregistered
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So no joy with the Hereford dealer The automotive spring manufacturer I approached will make me one, but the cost for a one off is prohibitive unless there are a few coups out there who fancy a group buy...... Joe- have sent you a pm, could you try your suppliers in Europe please...
Last edited by woodvurm; 18/04/2015 16:23.
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Re: Brake compensator spring
[Re: ]
#1534406
19/04/2015 12:00
19/04/2015 12:00
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woodvurm
Unregistered
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woodvurm
Unregistered
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An engineer mate told me needs to be same K-value Hookes Law The way I see the linkage functioning is that it translates the wide range of suspension movement into a much smaller range of movement at the piston with an amount of adjustment. I would therefore guess that the spring is there to push the piston back into the compensator against the resistance of the fluid in the system as quickly as possible when the brakes are released, changing the piston position relative to the suspension. Could it also actively control under braking ?
Last edited by woodvurm; 19/04/2015 12:07. Reason: wrong link
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Re: Brake compensator spring
[Re: ]
#1534415
19/04/2015 12:18
19/04/2015 12:18
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Joined: Dec 2005
Posts: 21,524 Aldershot
PeteP
Hon Club Member 005, Membership Secretary
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Hon Club Member 005, Membership Secretary
Forum Fossil
Joined: Dec 2005
Posts: 21,524
Aldershot
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The clue is in the word compensator.
It is there to control the amount of pressure going to the rear callipers. If the full force of the brakes was always applied to the rear then lock ups and ultimately skids can occur. Forwards weight transfer under heavy braking reduces the effective grip of the back wheels.
When the rear end rises under heavy braking the spring link to the anti roll bar acts via the lever to push the pistons back in to the compensator and reduce the braking effort to the rear wheels.
Hence why the strength of the spring and its set-up is important.
16VT and X1/9 1500
We must all do our part for the planet. I unplugged a row of electric cars that nobody was using.
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Re: Brake compensator spring
[Re: PeteP]
#1534447
19/04/2015 16:34
19/04/2015 16:34
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woodvurm
Unregistered
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woodvurm
Unregistered
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Yea compensates for extra weight in the vehicle like rear passengers and load in the boot ?
Also I may be wrong but I think piston fully into compensator is full braking and piston fully extended out of compensator is minimum braking ?
Otherwise how could I bleed my brakes with no spring and a cable tie holding the compensator piston fully in ?
I think everything is in balance between pressure within the braking system, spring strength and suspension position which is relative to the weight in the vehicle combined with shifting loads due to deceleration under braking.
Just wondered if it was a truly active control on the braking in terms of adjusting front rear split as balance changes during braking or just setting a split dependant on the amount of weight in the car.
Either way I don't think it will work properly without a spring that has the same characteristics.
I am wondering if replacing it with a manually controlled compensator would be an option ?
Last edited by woodvurm; 19/04/2015 16:51. Reason: added more
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