Ok, well we had hard brakes at one point, then a slight shudder, to a left front brake smoking! Stopped, then found the Fliud in Master Cylinder, slightly gooy..We then Flushed the system, 3-4 times. Have back brakes, but front is soft. Then, bought the hand vaccum pump, to shoot air out, still nothing! HELP! Is it the Vaccum Booster, or Master Cylinder?
Braking System on 1994 GMC Suburban 1500
by jerfano in Bend, OR on January 29, 2010
ANSWER by Oakman on February 01, 2010
It sounds like someone may have put the wrong fluid in the master cylinder of your 1994 GMC Suburban 1500. If that is the case it may be necessary to replace all the rubber components in the system. That would include the master cylinder, all brake hoses, front brake calipers, rear wheel cylinders (calipers if disk brakes), and possibly the ABS valve assembly. It may be a good idea to have someone qualified in brake repairs try and confirm the extend of the fluid contamination if the is indeed your problem.
The anti-lock brake system (ABS) front wheel speed sensors are prone to failure. When a sensor fails, the ABS warning light may illuminate and/or the ABS system may activate erratically.
Power brake systems using "hydro-boost" may leak power steering fluid from the hydro-boost unit located behind the brake master cylinder. Replacement of the hydro-boost unit is the common repair to...
how do i fix this problem? is it my brake pads? or what? When i press on the brake its like its bounce back?
The brake service light stays on all of the time. Is this an indication of a bad pressure switch? I notice that there is a "port" on either side of the pressure switch, what are these for?
my brakes lock up after about 1 min. wen you are goingh you can feel it sloweing down and i jacked up frontof truck wheel are stuck. i release the brake line at master clynder and fluid shot out th...