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.
SOURCE: brakes
Since there is no loss of fluid we can rule out any leaks. A poor booster would make you apply the brake much harder to stop. So somehow you are not developing the necessary pressure for the brakes to function. The pressure is developed by the master cylinder seals. You can get a rebuild kit or a rebuilt master cylinder but the real pain is bench bleeding the new one. Luck to you.
First look for obvious leaks under the vehicle, especially the inside area of each wheel... If you see fluid, you have either a blown cylinder seal or a bad line (check the rubber hoses to the front and back brakes too) Repair the offending part and bleed the air out of the system... (remember to clean pads or shoes if they have fluid on them)... If you see no hint of leakage anywhere, then suspect the master cylinder... if you remove the master cylinder, check and make sure that it didn't leak fluid into the brake booster diaphragm (Brake fluid will destroy the booster)... as in any repair when you open the system (lose fluid), you will need to bleed out the air to restore function... hope this helps...;-)
SOURCE: parking brake pedal goes to floor
The disc brake pads are NOT used for the parking brake. The parking brake uses mini-drum type shoes inside the rear disc rotor.
Take a look at http://wiki.answers.com/Q/How_do_you_change_the_emergency_brake_pads_on_a_2000_Chevy_1500_Silverado_Pickup
For more info
SOURCE: 87 jag xj6. Brake pedal spongy goes all the way
If the brake lines and fluid is clear then you may have to look at the brake booster found at the other end of the brake pedal under the hood...
SOURCE: brake pedal goes down to far abs brakes
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.
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COULD THE ABS BRAKING SYSTEM BE CONTRIBUTING TO THE BRAKE PEDAL
STILL GOING TO THE FLOOR, WHEN MECHANICS HACE REPLACED MASTER CYLENDER AND DONE OTHER CHECKS?
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