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General => The garage => Topic started by: dibdub on 10 December 2003, 21:40

Title: proportional valve?
Post by: dibdub on 10 December 2003, 21:40

hi new to volkswagen scene. need some help in question if anyone can help.any help appreciated!what is the proportional valve/load sensing valve on a mk 2 golf 16v braking sytstem?   might sound stupid but havnt a clue and car failed mot by it? :'(  where bouts is it located?is it easy fix?and is it dear to buy?any help again is appreciated and thanks in advance for any.

Title: Re:proportional valve?
Post by: Blue MK2 on 10 December 2003, 21:43

Has your car been lowered mate?

Title: Re:proportional valve?
Post by: dibdub on 10 December 2003, 21:47

no,got 16inch wheels on it if that makes any difference?

Title: Re:proportional valve?
Post by: Blue MK2 on 10 December 2003, 21:51

im no expert to that sort of stuff but it sounds like a sensing device that senses the rear weight of the car and adjusts the braking to this. ???

Im sure someone will come up with an answer later on. hold tight ;)

Title: Re:proportional valve?
Post by: golfvr6 on 10 December 2003, 21:51

The proportioning valve or brake pressure regulator limits the flow of brake fluid to the rear brakes depending on rear axle position. This is to prevent the rear wheels locking up before the fronts when under heavy braking.
What did it fail on exactly? seized valve?

Title: Re:proportional valve?
Post by: mk1 on 10 December 2003, 21:51

Hi dibdub.
The valve is a load compensating valve for the rear brakes, the more that you load up the car, the lower it will sit and there is a spring on the rear axle that is connected to the arm on the valve. The spring pulls the arm alowing more brake pressure to the rear brakes and more braking effort. Located on the n/s/r of the car, 4 pipes on it. Probly siezed, drown it in wd40 or similar, and work the arm back and forward. Check opperation by getting someone to press the brakes and the arm should move.
Steve.

Title: Re:proportional valve?
Post by: mk1 on 10 December 2003, 21:53

Ah, vr6. Beat me by 22 seconds ;)
Steve.

Title: Re:proportional valve?
Post by: golfvr6 on 10 December 2003, 21:54

I had a mk3 1.4 recently that failed the MOT on a seized pressure regulator. The MOT states that the lever on the valve must move freely. As Steve says use WD40 and work the valve lever with a big pair of grips. What works even better is to whack it with a rubber mallet.

Title: Re:proportional valve?
Post by: golfvr6 on 10 December 2003, 21:55

Quote from: mk1 on 10 December 2003, 21:53

Ah, vr6. Beat me by 22 seconds ;)
Steve.

Repect to Steve, he knows his oats  ;) ;) :) :D

Title: Re:proportional valve?
Post by: dibdub on 10 December 2003, 22:00

 thanks for the help i try what you say 2mo onit?  it might be ok, dunno ?with some garages so i thought id post to find out more bout it.cheers

Title: Re:proportional valve?
Post by: golfvr6 on 10 December 2003, 22:02

If the valve is just seized then you should be able to unstick it. Just spend plenty of time hitting it with a rubber mallet!  ;)

Title: Re:proportional valve?
Post by: richandhazel on 11 December 2003, 12:42

Hopefully what the guys have said will work as they aren't that cheap..........

Title: Re:proportional valve?
Post by: Zoid on 14 December 2003, 15:52

does that mean you need to adjust the valve if the car is lowered?

Title: Re:proportional valve?
Post by: richandhazel on 14 December 2003, 15:54

I would have thought so........

Title: Re:proportional valve?
Post by: golfvr6 on 14 December 2003, 15:54

Depends how low you go!