Question about GMC Sierra 1500
Brake fluid from the Master Cylinder leaks if the Master Cylinder is
leaking itself otherwise the leak is somewhere else, have some one check
this out, it could be anywhere and you should have seen some drops on
the floor by now.
Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.
You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.
Also, this article could help to check it: how-to-fix-a-brake-fluid-leak
I hope helps (remember to rate and comment this).
Posted on Oct 03, 2010
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Posted on Jan 02, 2017
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Fig. 1: Loosen the front brake line in order to bleed the master cylinder
Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid
Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system
Hope this helps to solve it; remember to rate this answer.
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