Soft brakes

[90FIRSTGEN CUMMINS]

This past weekend i was hauling one of my farm tractors back from a show and there is a really step hill comming out of the show grounds. As i went down the hill at a low speed i noticed my brake pedal went really far down and the lights on the dash came on. Anyone know what would cause this.

[PToombs]

Blew a brake line or the ABS valve screwed up.

[RumbleFish]

and dont forget the obvious, as pete did, and check the fluid level.

[90FIRSTGEN CUMMINS]

the funny thing is once i got back on the road it seemed the brakes came right back but at the low idle was the only time it was like that.

[Ace]

Lost vacuum? Booster going south? Maybe check for vacuum leaks...

[dpuckett]

I'd think a bad booster/ low vacuum would just make the pedal hard, not necessarily make the pedal low or soft. I could be wrong......

My money is on the ABS or master cylinder.

[90FIRSTGEN CUMMINS]

Master is new so what would it be with the abs??

[dpuckett]

NEW or reman? Remans are junk, and I havent had any luck with brands other than Bendix.

With the AntiStop Brakes, the dump valve cen get stuck about half open, and you fill the accumulator, giving a low, mushy pedal.

DP

[90FIRSTGEN CUMMINS]

Its new cause the reman i tried to get was totally wrong.

[cougar]

I am trying to remember if the RWAL had a G sensor in the control box. If there is, it may interpret down hill as a potential lock up.