Re: ANOTHER #%*!:( BTV failure
Posted by HH56 On 2010/10/3 21:08:39
In your pict 8039 it looks dry but maybe down low. That is why I asked if any spilled. What it does is to provide a path between the hydraulic seal in the fluid chamber and the secondary or vacuum seal on the canister side so that if there is any leakage, there is a place for the fluid to return to the liquid side rather than being forced into the vacuum side.
The port on the compensator valve is a machined hole and is large enough to allow the stem to tilt the rubber away. When the piston is retracted, a lip catches the end and pulls it back so fluid can return to reservoir. The underside of the assembly should also be machined and provide a very smooth surface that the lip on the valve blob can seal against. The rubber lip should be a good distance away from the hole all around and absolutely flat & sealed when valve is in the upright or closed position.
When you do replace the valve, make sure the stem is on the back side of the plunger edge as shown in illustration--otherwise if in front, first time you step on brakes the stem will bend or break.
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The port on the compensator valve is a machined hole and is large enough to allow the stem to tilt the rubber away. When the piston is retracted, a lip catches the end and pulls it back so fluid can return to reservoir. The underside of the assembly should also be machined and provide a very smooth surface that the lip on the valve blob can seal against. The rubber lip should be a good distance away from the hole all around and absolutely flat & sealed when valve is in the upright or closed position.
When you do replace the valve, make sure the stem is on the back side of the plunger edge as shown in illustration--otherwise if in front, first time you step on brakes the stem will bend or break.
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