Question about 1985 GMC K1500
Bleed brakes the pedal is hard then after I start it the brake pedal goes soft
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Posted on Jan 02, 2017
SOURCE: 1999 GMC Sierra brake problem
When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.
Gravity bleeding is when you just open the valve and let gravity pull the fluid down.
Keep in mind you must "prime" the master cylinder first before installing it, did you do that?
Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.
After this procedure you gravity bleed the brakes, then go on to the pedal technique.
Posted on Sep 04, 2008
SOURCE: 2003 GMC Sierra Brake PROBLEMS!
Try vacum bleeding with a vacum pump from any parts store. You definitely have air somewhere and vacum bleeding usually works and you can do it by yourself.
Posted on Jul 07, 2009
SOURCE: excessive brake pedal travel
Do you need new pads? Did you try to bleed the master cylinder? Are you sure you bled the system correctly? Excessive travel is almost always air in the lines of not enough brake fluid.
Posted on Aug 10, 2009
Hi I'm litoshop if you bled the system and get no results then your brake pump needs to be replaced now before replacing make sure your pads are installed correctly because if there not this to can cause this problem good luck. if this information has been useful please let us know thank you.
Posted on Aug 11, 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!"
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