God morning,
Still have a 1995 Monte Carlo, that I bought in April 1994. It has been sitting inside car canopy for last two years. I finallly thought it was time to move it. When I went to apply brakes when first backing up, pedal went to floor but stopped. Checked brake reservoir, it was empty so I filled it. Applied brakes again same result. Left resevoir lid off, applied brakes, no bubbles or signs of fluid movement. So I presume Master Brake cylinder is gone. New cylinders aren't that much, but with ABS it looks like a chore.. Any info or instructions on how to swap out would be helpful.
Ted

 

So you had no fluid, then topped it off?

The cylinder might not be bad, you might have a leak in one of the lines or just need to bleed the lines.

 

^^^ I agree with Mike ^^^

If the car lost the fluid in the master cylinder while sitting for 2 years I would suspect a leak in either a line or a caliper. I'd give the entire brake system an inspection prior to committing yourself to a master cylinder R&R. That much fluid leaking out should be fairly easy to spot since the car has been sitting.

 

When I put fluid in master cylinder and left cap and pump pedal, there is no movement in fluid in cylinder or even overflowing onto reservoir by pumping pedal..Thats why I thought it might be bad,