Question about 2001 GMC Jimmy
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Posted on Jan 02, 2017
SOURCE: the brake light on the
There is a level switch in the master cylinder if the fluid level is low it will turn on the light and If you pressure or vacuum bleed the brakes you will center the proporting valve switch that warns of low brake pressure in either Front or rear.
Vacuum bleeding I have found to work the best.
Make sure the Park brake lever is all the way released. If you find this informationn helpful please leave me a favorable rating and by all means contact me if I can be of any further help.
Posted on Aug 10, 2008
SOURCE: front brakes stay locked up
You may want to replace your flexible feed lines to the calipers. Any little bit of **** in them will not let the brake fluid out of the caliper,
Posted on Jul 29, 2009
It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.
Posted on Sep 15, 2009
Testimonial: "Hadn't thought about the O-rings on the rod thanks for the idea. Great Idea Thanks!"
check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now
Posted on Dec 09, 2009
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