Good grief how long does it take to bleed a brake system?
 

I converted my rear brakes from drum to disks. I tried for a good hour with the wife pushing the brake pedal and didn't get a drop out of the rear brake lines yet. Perhaps it takes longer than I expected....?

Re: Good grief how long does it take to bleed a brake system?
 

We were just having this discussion here:

http://67-72chevytrucks.com/vboard/s...02#post6017202

Similar issue, perhaps?

K

Re: Good grief how long does it take to bleed a brake system?
 

It's possible the proportionating valve has slid over & not allowing fluid to rear.I just went thru similar thing on my 82 K25 when I replaced wheel cylinder.You need to bleed the front right hand side first to get the valve to slid over,then you should get fluid to rear.Unless it's like mine was,ended up replacing master cylinder as well.
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Re: Good grief how long does it take to bleed a brake system?
 

I have an adjustable Willwood proportioning valve so that shouldn't be the issue. I wonder if my master cylinder is bad....?

I expected to see the fluid level in my master cylinder to drop a little more rapidly. However, it seems to be dropping very very slow, if any....

Re: Good grief how long does it take to bleed a brake system?
 

I was getting a small amount of fluid at rear axle,but very little pressure.Swapped m/c out off a parts truck & all kinds of pressure now.That might be your trouble too...My fluid level in old m/c didn't drop much either..
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