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Hobbies - Musician - New Member United Kingdom - Member - New Member

Join Date: Mar 2007
Location: England
Posts: 940
Good Answers: 47
In reply to #23
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Re: Motorcycle Front Disc Brake Problem

09/09/2011 3:43 AM

Hi dj95401. What I am referring to is not the same as the proportioning valves or pressure reducing valves you often see. It is a check valve, in fact, to be precise, it is a double or two-way check valve, although VW refer to it as a 'Residual Pressure Valve'. Its' purpose is to maintain a residual pressure in the brake circuit when the pedal is released in order to avoid excessive pedal travel when the brakes are re-applied. Here is a diagram:

As you can see, if the main valve was seized the pressure in the brake circuit would not be relieved.

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