Don't have brakes - 1998 B2500
#1
Don't have brakes - 1998 B2500
Hi all,
Here's what I have going on. Back in December, as I was driving, a usually stiff brake pedal suddenly went to the floor. I topped off the fluid and the brakes worked okay, pedal was still soft though. I lived with the soft pedal until yesterday when the brakes failed altogether. As far as I can tell there is no fluid leaking anywhere. I can hear the brake booster trying to work by the audible hiss when I depress the pedal. The master cylinder is still full of fluid from the last time I topped it off. What am I missing? This thing has no brakes and by everything I've looked at, it should.
Here's what I have going on. Back in December, as I was driving, a usually stiff brake pedal suddenly went to the floor. I topped off the fluid and the brakes worked okay, pedal was still soft though. I lived with the soft pedal until yesterday when the brakes failed altogether. As far as I can tell there is no fluid leaking anywhere. I can hear the brake booster trying to work by the audible hiss when I depress the pedal. The master cylinder is still full of fluid from the last time I topped it off. What am I missing? This thing has no brakes and by everything I've looked at, it should.
#2
The brake master cylinder is a pump. I'd get a helper to pump the brake pedal as you attach a tube to a brake bleeder and try bleeding, see if the MC actually pumps.
Sounds like fluid was real low, and you got air in the brake hydraulic system. I'd get a helper to pump the brake pedal and try bleeding; if that restores brake operation, then you should carefully check the hydraulics for leaks: lines, calipers, wheel cylinders. But most often a master cylinder will leak at its rear seal, into the brake booster, so that might not show an external leak.
Sounds like fluid was real low, and you got air in the brake hydraulic system. I'd get a helper to pump the brake pedal and try bleeding; if that restores brake operation, then you should carefully check the hydraulics for leaks: lines, calipers, wheel cylinders. But most often a master cylinder will leak at its rear seal, into the brake booster, so that might not show an external leak.
#3
Thanks Cusser. I also googled the issue and found that the booster check valve may be bad allowing air to get into the lines. So I got one of those I'm going to install today and bleed the brakes as well. I'll post about the results later.
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badassgurl1030
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12-29-2011 05:09 PM