so i just bought the car yesterday its a 91 rs 305 auto. my problem is that when i step on the brakes and hold like at a stoplight or getting off the freeway the pedal starts to sink till in hits the floor then the abs light comes on and the car starts to roll. i know it needs new wheel cylinders (already have them) but as is the car doesnt leak. i need help fast because i drive my son 10 miles to daycare in this car

 

Sounds like a internal leak in the master cylinder to me.

 

thanks second opinion anyone?

 

Falling pedal with no fluid loss is the master cylinder "recirculating" fluid instead of pumping it. Get a replacement and be sure to bench bleed it per the directions.

 

Have you checked the fluid in the master?

JamesC

 

master cyl. is full. i got a replacement today lets hope this work

 

Problem solved! thanks for the advice new master and rear wheel cylinders, shoes, drums, and a brake flush.