Brakes locking up
We just took it for a drive and the brakes are locking up on all four wheels. We recently replaced the new wheel cylinders and brake shoes on the rear. All four wheels are locking up. I have drum brakes on the back and disc brakes on the front. Any ideas. We've thought maybe kinked lines but then what are the chances of all four being like that, also I've heard people say it might be because I've my old brake fluid in there but I just want to hear some other ideas
I'd take a guess at the proportioning valve. Dirt in it. They give us such fits bleeding, why won't they be a pain in the butt like this. Try cracking the lines at the master cylinder to see if fluid will back bleed from the wheel cylinders. If nothing, then try cracking the lines where they go into the prop valve and see if it back bleeds out the valve.
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