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post #1 of 15 (permalink) Old 22nd September 2016 Thread Starter
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Twingo C01 drum brakes proportioning valve

Hi guys,

I have an Twingo 2000 with D7F inside that made 130 000km so far. I know this car wasnt sold in left hand drive version for UK, but this is popular forum internationaly so i will try and ask.
Every year i have more trouble passing MOT since i have very little brake force on rear brakes - drum brakes about 400-450. Always very good on front axle 1800-1900. If i load the trunk i get 600-700. However before the problems started, a few years back, i got 1000-1100 with full trunk and fuel tank.

The cylinders are not leaking, i've checked for air and all i got was clear brake fluid, i adjusted the adjusters which were dry, and that is about it. The pads look as new and are not worn.

I've looked carefuly on the rear bridge and folowed the brake lines and i cant see that car has proportioning valve on rear axle. However i found TRW GPV1177 in catalogue for the car. If Twingo has this, where would it be located?

So before i spend money on new cylinders, does this car have proportioning valve, and if it doesnt, how does it regulate rear and front brake force?

Also the front springs are bad and front end is down about 7cm, I'm planing on replacing them. Can this cause problems with dividing the brake force?

Thanks for any help
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post #2 of 15 (permalink) Old 23rd September 2016
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Re: Twingo C01 drum brakes proportioning valve

Easiest way to find it, follow the brake pipes from the front,, going to the rear, you will find a unit with 4 brake pipes going to it.. thats your load sensing valve ( it might be tucked up in one of the corners) but you will have to keep following the brake pipes,, not all can be seen easily
You will see some thing that looks like a lever pivoted on the unit..
Make sure this is free, these seize up,,

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post #3 of 15 (permalink) Old 23rd September 2016
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Re: Twingo C01 drum brakes proportioning valve

The other thing that will bring down rear brake force on drums is adjustment before/when the drum is put on.

When drums wear, there is a little lip formed on the outer edge.
This stops the drum going on if the shoes are adjusted far enough out to sit on drum diameter properly.
They will not sit properly inside drum and brake force reduced with this.
Adjuster will not cope with this.

Clean the lip off.
Bolting the drum back to front on hub and a power file, belt sander or the like cleans it off in seconds.
Or a hand file takes a little longer.
Just the lip, not the friction surface.
Then you can tweak adjuster so the drum just slips on.
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post #4 of 15 (permalink) Old 23rd September 2016 Thread Starter
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Re: Twingo C01 drum brakes proportioning valve

I dont think that it's the lip. When i adjusted the brakes, if i turned adjuster a bit more, the drum wouldn't turn on it's own and the brakes would heat up after driving. Like when the hand brake is lifted. I doubt this is friction from the lip to the shoes.

I still dont understand, the only place this regulator can be located if i'm correct is on the rear axle? between the bridge and chasis?
And still the question is how is force distributed if there is no regulator?

Is it common for cylinders to sieze up?
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Re: Twingo C01 drum brakes proportioning valve

Here's the picture of rear bridge, i dont thik there is regulator her, only interconection between hard and soft piping.
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