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Ask Ted G. Your Own Question
Ted G.
Ted G., ASE Certified Technician
Category: Acura
Satisfied Customers: 6159
Experience:  20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
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Acura 2001 3.2TL When you step on the break pedal it goes

Customer Question

Acura 2001 3.2TL
When you step on the break pedal it goes down softly almost to the floor before it stops the car. It seems that it progressively got softer slowly so one did not notice it. The break system has been repaired - brake pads, calipers, master cylinder, fluids etc. The problem persists. When the engine is turned off the brake pedal is just fine, the way it should be, but start the engine and the pedal is soft.
Submitted: 1 year ago.
Category: Acura
Expert:  Ted G. replied 1 year ago.

Do you have an ABS or brake light on?

Customer: replied 1 year ago.
neither light is on
Expert:  Ted G. replied 1 year ago.

Okay, good. There is most likely air trapped in the ABS unit that has not been properly bled out. It needs to be done with a scanner to activate the valves open and closed, this allows the fluid to push the air out. Occasionally a pressure bleeder will also need to be used in conjunction. (It can be tough to get some of them clear). Basically the air pockets "hide" behind the ABS valves when shut off. When you start the car, the valves cycle and the air is released into the system, causing low brake pedal.