I need HELP, pleaseeee

[GotGrunt]

I need HELP with my brakes, pleaseeee

OK, here it goes (sorry about the length):
My brake light came on last month and my power brakes went out (powerbastard, lol). The accumulator ball had just been replaced and the switch looked good so I assumed it was the motor/pump. I bought a brand new one and finally installed it today. Re-connected all the wires and what not and guess what... NOT CYCLING! I'm about fed up because I just spend 130 bucks on the new motor and now I think I might just go to a vacuum setup. I think it might be an electrical problem because this whole mess started after I wired up my boost guage to the "lights" on the back of the radio - also, my fan delay relay needs to be replaced because after I shut the car off the fan doesnt keep running. I noticed that the powermaster fuse is wired to it, would that have anything to do with it? Should I just not bother with it and convert (I'll be out 130 bucks for the new pump/motor) ANY help is greatly appreciated, Thanks guys

 

[Black Car]

Did you check the fuse to the PM?
Does the connector to the motor/pump have corision (sp) on it?
Have you performed the check out from the gn/t-type site?

If water temp isn't high enough then the fan won't run after shut down.

Gary

 

[GotGrunt]

Yes, The fuse(s) for the brakes were fine but I changed them anyways... no help there. The trouble shooting on the GNT-type site tells me the pump/motor is at fault (could be wiring/electrical). The fan, no matter what running temp, will not stay on after shutoff (it used to, i guess the relay went bad). Im at a dead stop (no pun intended), I have no idea what this could be...

 

[WarpSpeed]

I could be wrong, but the fan will run if the A/C(or defroster) is on. It won't usually after you turn the key off unless the temps above 200, or what ever that sender under the throttle boby is looking for.

 

[BADDGUY6]

Check

Might be the 5 amp RLYS fuse? On the fuse block it's on the top right. Next to the 5 amp Cruise fuse.

 

[GotGrunt]

Badguy, Is this the fuse labeled "powerbrake" on the curcuit board and in the owners manual... I know I replaced the one on the fuseboard and the 30 amp on the relay under the hood.

Warpspeed, My fan used to stay on for like 5 minutes after shutoff if the fan was on when I shut it down or sometimes a few minutes after i shut it off it would kick on to cool the engine off. It stopped working when the key is out of the ignition.

Anyone have a problem like this before?

 

[BADDGUY6]

Originally posted by GotBoost
Badguy, Is this the fuse labeled "powerbrake" on the curcuit board and in the owners manual... I know I replaced the one on the fuseboard and the 30 amp on the relay under the hood.

Anyone have a problem like this before?

I don't have a owners manual So I don't know how they're labeled BUT I got a GM service manual And it says there's two(2) fuses in the Powermaster circuit. (1)A 30 amp fuse to the right of the 20 amp CLK-CIG fuse on the fuse box.(2) And 5 amp fuse top right on fuse box next to the 5 amp Cruise fuse. Check them. I had the same problem when I changed my PM. Both fuses was blown.

Guy

 

[GotGrunt]

Guy,
Checked em'... The one next to the CLK-CIG labeled "power brake" had a 25 amp in it so I put a 30 in place of it like u said. The top right next to the cruise labeled "C/H" had no fuse in it so I put a 5amp like u said and nothing... Also checked the 30 amp under the hood and its fine.

 

[Doug Jacobson]

I know it may sound like someting too easy but did you check to make sure everything has a good ground? More times than likely this is the problem and it's right under your nose. May not be the fault but I'm just brainstomin' for ya.

 

[GotGrunt]

Doug,
I'll take any ideas that you can throw at me. What grounds should I check? I grounded my boost guage to the knuckle under the dash that had another ground to it. This brake problem started after I wired that guage up so I checked my power splice into the back of the radio and that looks OK but lemme check the ground on it. Anything else?? I am stumped. It just doesn't want to cooperate with me...

 

[GotGrunt]

TTT
Any more ideas? I don't care how stupid it may be... It just might work!

Oh, I was told there is a control relay for the PowerMaster Brakes that gets its power from the AirConditioning Relay... where is that. Could a bad pressure switch cause this problem as well (pump not to run, brake light on)?

 

[John Larkin]

Check my post from a week or 2 ago called "Powermaster Blues". It ended up being a bad connection for me. You really need to go through the system with a multimeter and check continuity at every connection plus the constant power/switched power wires as outlined in the gnttype diagnostic procedures.

 

[GotGrunt]

John,
I read your post and it doesn't really specify how it was fixed. Where was the bad connection. What is the fix if it is something in the wiring harnesses?