Installed hydroboost and now my rear ABS light is on

[Alex S]

So never had any problem with the rear ABS before, but now i installed a hydroboost setup and took it for a test. So i smashed the brakes a few times for a test, all 4 locked up the rear ABS did its hop-scotch thing and all was fine. Now i look down and my rear abs light is on. When i turn the key on it comes on like normal then goes out then back on. Any ideas? I guessing i blew out some seals internally in the valve thingy in the frame?

 

[Mat J]

did you bleed the rabs unit?

 

[Alex S]

no because i never disconnected the MC from the system

 

[zpd307]

mine does that also. calvin advisd that the hydroboost overpowers the rabs, therefore setting the dash light. your options are, ignore the light, like i do, or disconnect the bulb.

 

[icanfixall]

My hydroboost conversion didn't do this lite issue. I did change the master cylinder out to the F450 mc with the 1 5/16 bore. Now as my parking brake sets lower and lower to the floor I just manually adjust the rear brakes and all is good again. The brake peddle never does sink to the floor at stops nor does it set low to the floor...

 

[towcat]

So never had any problem with the rear ABS before, but now i installed a hydroboost setup and took it for a test. So i smashed the brakes a few times for a test, all 4 locked up the rear ABS did its hop-scotch thing and all was fine. Now i look down and my rear abs light is on. When i turn the key on it comes on like normal then goes out then back on. Any ideas? I guessing i blew out some seals internally in the valve thingy in the frame?

you didn't kill anything.
the hydro is just powering past the ABS's capabilities.

 

[Alex S]

hmmmm well thats kinda lame, Will the abs regulator or whatever it is from the F 450 solve this?

 

[towcat]

f450's didn't have ABS as an option.
they didn't want anything getting in the way of stopping a 15k gvw truck.
before you get all bent and stuff, make sure your rear brakes are adjusted up. that will cure the ABS light issue for most of the time.

 

[Alex S]

ya ok i'll give that a shot

Thx