Brake fluid was contaminated. flushed brake lines. I changed master cylinder, hydro-boost brake booster, rear calipers and pads. I bled master cylinder before installing and bled all brake lines beginning with right rear (furtherest from hydro booster). Took to brake place and they bled on machine. Still rear brakes do not work. Pedal goes to floor and comes back up slowly. Front brakes will finally stop truck
Hello Patricia,
Have you checked the master brake cylinder reservoir for brake fluid loss?
I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.
The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.
If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.
Find more information here:
. Hydro Boost Power Assist Systems Operation Diagnosis and Repair
Hydro Boost Power Assist Systems Operation Diagnosis...
Hydro boost power assist was...
SOURCE: brake pedal dropping to floor
do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.
Testimonial: "Thank You"
SOURCE: I replaced disc brake pads,
Check your lines going to the brakes the rubber hose on the 1993 chevy have a tendancy to crack and brake are you using an excess of brake fluid
SOURCE: No pressure on brake pedal 95 suburban 2500 4x4 7.4L
try bleeding your ABS block first, if that doesn not work could need a master or proportioning vavle. Some scan tools are capable of bleeding the ABS system on some vehicles, and some you have to bleed manually.
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