so my abs light comes on at random times and goes off at equally random times. sometimes it comes on when i start the car, other times it comes on while braking.

I have noticed a hard brake pedal for a long while now, and i hear the release of pressure from the master slave cylinder just after startup. i have also experienced wheel hop and brake hop, not the abs. I was thinking of rebuilding the pistons and putting in new brake lines along with rotors and pads, but i don't want to spend all that money if it is something small.

does anyone have any suggestions, or other things to look for.

oh...about 2 weeks ago my brake fluid was almost empty, never had a problem before or since. I think this is when the abs light came on first.

 

Watch out, I had problems w/ "dissapearing" brake fluid. A week later the brakes went out going down hill; almost killed my poor 7. It ended up being a bad master cylinder but I'd check the lines very thoroughly first (since they're cheaper)

 

any other ideas???

 

if its leaking out its probably the master cylinder that NEEDS replaced. replace it before too much drips down the car and eats off the paint, which allows it to rust.

 

my 7 is doing the same thing. Found out it was leaky master cylinder. Havent got the chance to put it back together yet but Im 99% sure that was my problem. Definately check all your lines, its tedius but hey it's a 7, also check for any leakage by the bleeders and all connecting points. If you suspect a spot where it is leaking, spray it off with some brake cleaner and dry area. Check it at a later time for any wet spots, trace it to where it came from.

 

you, know i thought it might be the master cylinder because i can hear a bit of air leaking when i have someone press the brake pedal. i was told that air will escape when the m/c goes bad. i may just get a new one and put it in.