Loosing brake fluid.....
Pro
Joined: Feb 2007
Posts: 740
Likes: 2
From: San Antonio TX
When this happened after installing the DRM spring, I had to manually locate the shuttle valve to center and pin it down with a modified bolt. Did this by removing the white switch and replacing it with the bolt. Then the brakes were bled and the white switch was reinstalled. It worked for me and 20K miles later all is well.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
1. be careful in sticking any bolts in the hole because of the threads may not be a match.
2. TO be safe, use a bolt that is too small.
3. grind the end of the bolt to a small diameter.
4. If you bench bleed, the bolt is not needed.
The reason the fluid comes out of the hole, (the sensor indicates the loss of fluid) is because the sensor is doing it's job, but over travels. If the benchbleeding occurs, you can't over do it with your hand, but you can really mash it with your foot.
The piston moves in one direction or another, and the foot of the sensor rides up on the shaft, and makes contact, turning on the light.
No fluid is supposed to come out of the switch hole because of obvious brake pressures, and the switch is plastic and easily distortable.
2. TO be safe, use a bolt that is too small.
3. grind the end of the bolt to a small diameter.
4. If you bench bleed, the bolt is not needed.
The reason the fluid comes out of the hole, (the sensor indicates the loss of fluid) is because the sensor is doing it's job, but over travels. If the benchbleeding occurs, you can't over do it with your hand, but you can really mash it with your foot.
The piston moves in one direction or another, and the foot of the sensor rides up on the shaft, and makes contact, turning on the light.
No fluid is supposed to come out of the switch hole because of obvious brake pressures, and the switch is plastic and easily distortable.
Last edited by coupeguy2001; Dec 10, 2010 at 12:41 AM.
