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I was told by a dealership that the pedal fade is normal. GM products do it too. Replaced the master cylinder on a '93 GMC pickup owned by company owners son because of the pedal fade. The was told it's normal because the new one did the same. I still have that master cylinder in a box in the archives, because apparently it's still good. Ask the mechanics at a dealership about this situation and how you've changed things to no avail and see what they tell you. Good day.
brake and abs light check brake fluid level. The round float in the master cylinder directly controls the 2 dash lights.
The light is NOT directly controlled by the master cylinder float. The light is controlled by the ABS Module, which location depends on your vehicle. There are a number of different reasons the lights come on. If it comes on but shuts back off within seconds, don't worry about it, that occasionally happens when it gets a bad signal ("nonlatching error"). In rear-wheel-drive (RWD) vehicles, it is common for the differential speed sensor in the rear differential to go bad. You can pick up a Haynes manual to find if you can do at-home diagnostics (Temporarily grounding out the diagnostic lead will cause the ABS light to flash out a pattern indicating the error)
Check the Brake Pressure switch ( also known as SPEED CONTROL DEACTIVATION SWITCH ) which is located below the Brake fluid master cylinder for leakage. The leakage can cause both lights to stay on and also cruise control control not working
is the abs light on?the abs system only effects the pedal when you are stopping quickly to activate the system. you still have a hydrualic brake pressure problem. are the rear brakes shoes or pads? rear shoes out of adjustment can cause a low brake pedal.even though the master cylinder has been replaced doesn't mean you got a good part.if the part was a remanufactered part very likely it is bad. to determine if it is the master cylinder, plug off the lines from the side off the master cylinder and hit the brake pedal. if the pedal stays up look for a problem elsewhere in the system. if the pedal drops the the master cylinder is defective.
ABS is anti lock braking system,which helps to stop car in various conditions.Wet/slippery etc
Sensors are located on all brakes
You need to go to your local auto electrician who will plug in scanner to locate fault
When u power up the vehicle ABS does a self test(light stays on a few seconds then cuts off) and if it see's a problem will shut off and illuminate the ABS lamp. It will also do a second test on iself when you reach a speed of around 12-15 mph,it will run the pump for a few seconds to check pressure and look at the speed sensors,if it see a problem here it will again shut down and illuminate the ABS light.
Now if the red brake lamp is on then it will shut down because it thinks you have a hydraulic concern and will not try and run ABS if this is the case.
If red brake lamp is on most likely if you have good brakes it is a problem with the float sensor in the master cylinder reservior,maybe its bad or just stuck,or just low on fluid.
have you checked the master cylinder ? As this will cause the ABS lite to come on if it s bypassing inide. hope this helps as I have seen it many times. Good luck and remember to rate all solutions you get. Thanx
P.S. If you change the master cylinder remember to bench bleed it and be sure to transfer the rubber " O " ring from the old one to the new one ( located on the back side o the master cylinder ). Or you will have lots ofpedal and no stopping ower.