10-28-2009, 07:48 AM
I have never heard of pulling the pin on the proportioning valve when bleeding. I've always replaced them when the bias had been tripped or indicated. When it is tripped the switch should be made causing the emergency brake light to turn on, indicating a problem.
You have replaced the valve before? Have you tried a standard drum brake H block instead of the disc brake proportioning valve? Or for experimental/diagnosis purposes bypassing the proportioning valve completely?
You have replaced the valve before? Have you tried a standard drum brake H block instead of the disc brake proportioning valve? Or for experimental/diagnosis purposes bypassing the proportioning valve completely?
'72 TBA...