Search results

First off the proportioning valve is down the line from the Master cylinder. The valve can be reset by stabbing the brakes "sometimes" but not all times. The best way is to manually push in the button. This valve actually "blocks" the flow of brake fluid, so unless it is reset you will have a...

Did you by chance push in the little button on the proportioning valve (pressure differential valve) ? When you loose pressure the switch is activated warning you of a leak or bad brakes. This is usually a red warning light on the dash. When this happens you must "reset" the switch by pushing in...

Good to hear all is well.

Sounds like someone forgot a seal when they built this master cylinder. Is it a rebuilt ? They could have forgotten the pin that separates the two chambers from each other. This would allow the front brakes to bleed back to the rear brakes. I have seen this happen before.

This valve will not cause this problem. Sounds like the master cylinder is not picking up the primary circuit ( front brakes). Since this circuit is the last in order of application (front of master cylinder) it is the hardest to bleed out. Especially in a GM system. I would remove the brake...