Twingo C01 drum brakes proportioning valve - Page 3 - Renault Forums :: Independent Renault forum

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post #11 of 15 (permalink) Old 25th September 2016 Thread Starter
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Re: Twingo C01 drum brakes proportioning valve

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Originally Posted by Dancingdad View Post
Tried looking at this from the other direction.
The valve number you gave TRW GPV1177 leads me here.
Analog parts of manufacturer: RENAULT - 770832859
Complete with pretty picture.
Which looks like a mechanically operated valve that would normally be on rear suspension somewhere.
Specifically says fitted to the CO6 models but you would need to work out what one of them is.

All I can suggest is looking round the suspension areas and seeing if you can find it.
If not, I reckon there isn't any proportioning valve as standard and any load sharing is down to brake design.
This is helpful, since this is for Bendix system, and i have Lucas system.
Will work on it next weekend. thanks for the tips. will take some pictures.

However i came to ask experts how the system works when there is no proportioning valve. Who does proportioning, master cylinder? and on which priniciple? Dont want to hunt the problem by changing parts that are alright.
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post #12 of 15 (permalink) Old 25th September 2016
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Re: Twingo C01 drum brakes proportioning valve

If no valve fitted, then your master cylinder will be doing it..
Or, have you got two valves coming off your brake master cylinder, could just be below, and connected to the two brake pipes going to the back of the car...
Before you go hunting,, have you had any brake pipes replaced on your car, or wheel cylinders..

These valves are about 2 and 1/2 inch in length ..With a diameter of an inch,,,
Not saying they are fitted,,,
If its part of the master cylinder, then its just a new master cylinder needed.
Or you can take it apart, clean the inside, there should be two pistons, or pressure relief valves inside...
Most master cylinders will not come apart.. Unless the reservoir is removed.. There is usually a pin going through, holding the pistons in, as well as the e,clip/c.clip, that can be seen , where the push rod pushes on the piston.

Once stripped, you will find seals ,,, spring/springs, discs with holes in.
These need to go back in, so its carefully stripping down, .
Examine all parts,, clean all parts, rebuild...
It could just be down to a build up of dirty fluid,, this blocks the holes in the disc, so not enough fluid enters in to the rear pipes
Have given you the gist, of how to strip..
But if your seals are showing signs of wear.. The cost of these, and the time scale, waiting for them!!!! Its usually more prudent to replace with a new master cylinder....

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post #13 of 15 (permalink) Old 25th September 2016
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Re: Twingo C01 drum brakes proportioning valve

Quote:
Originally Posted by msegvic View Post
This is helpful, since this is for Bendix system, and i have Lucas system. ..........
I think you may be missing the point.
The lucas part number you gave (Girling and TRW are Lucas) all point to a valve that is mounted on the suspension and shares power according to load.
Mechanically operated load bias/proportional valve.
And only fitted on the C06 variants according to the information.
Alternative Electronic systems work with ABS, which you don't have.

Various alternatives such as the Maxteret system can be discounted.
Which comes back to any load sharing is fixed and dependant on the system design.

And comes back to either master cylinder/servo is not chucking out enough pressure. (probably able to discount as fronts ok?)
Or cylinders/shoes/adjustment/pipes
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post #14 of 15 (permalink) Old 25th September 2016
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Re: Twingo C01 drum brakes proportioning valve

Quote:
Originally Posted by msegvic View Post
This is helpful, since this is for Bendix system, and i have Lucas system.
Will work on it next weekend. thanks for the tips. will take some pictures.

However i came to ask experts how the system works when there is no proportioning valve. Who does proportioning, master cylinder? and on which priniciple? Dont want to hunt the problem by changing parts that are alright.

Can I just say you have had some advice off two of the best experts we have on the forum.. I'm hopefully misreading the post and I apologise if this is the case..

Stu
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post #15 of 15 (permalink) Old 26th September 2016
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Re: Twingo C01 drum brakes proportioning valve

Are the proportioning valves not in the rear wheel cylinders?

I had a Peugeot 309 that had them in the wheel cylinders.



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