Brake Motor Does Not Run (help!!)

[BUICKGNX]

Please help me My 87 gn has a problem with the brake system. The motor does not turn on (cycle), and the brake pedal is very hard with the brake light on at all times. I checked the pressure switch connectors (A,B,C) & the Pump connectors (A,B,C,D). "A" from the pressure switch is to be with "D" from the pump. I tested them with a test light but there is no light on. "B" on the pressure switch connector seems to be a little weak. The light does come on. The remaining terminals on the plugs seem to be ok.

Please help!!! What do i do now??

Mike

 

[Topjimmy]

Check the brake fuse in the fuse box?

- Jimmy

 

[BUICKGNX]

I CHECKED ALL 3. THEY SEEM TO BE OK

MIKE

 

[BUICKGNX]

BRAKE PROBLEMS!! HELP!!!!!

PLEASE RESPOND ANYONE. THE FUSES ARE OK, JUST THE PS CONNECTOR TERMINAL A DOES NOT LIGHT UP, B IS A LITTLE WEAK, AND C IS OK. THE PUMP CONNECTOR ON THE OTHER HAND ALL WORK EXCEPT FOR D.

PLEASE HELP ME GUYS.
MIKE

BUICK CAR CRAZY NUT

 

[TS6]

When mine did that it was a bad accumulator ball. HTH

 

[BUICKGNX]

DID YOUR CAR HAVE THE EXACT SAME SYMPTONS WHERE THE PUMP MOTOR DID NOT WORK. IF I CHANGE THE ACCUMULATOR, WILL IT SOLVE THE PROBLEM?? COULD IT BE THE SWITCH?? I TRIED DISCONNECTING THE SWITCH CONNECTOR FROM THE SWITCH. WHEN PLUGGED IN THE BRAKE LIGHT IS ON. WHEN DISCONNECTED THE BRAKE LIGHT IS OFF

PLEASE HELP

THANKS

 

[Garycar]

If the hydro-electric motor is not operating and the fuses and pressure switch are confirmed to be good, you might want to look at the motor itself as the possible problem. The motor should cycle on and off as needed to maintain the range of pressure necessary to operate the system.

 

[MistaScott]

First, go here http://www.gnttype.org/techarea/brakes/PwrMstr.html

Your motor may have gone bad. If so you have two options:

1) remanufactured Powermaster unit
2) vacuum brake conversion

Do a search on Powermaster and the remanufactured unit part number etc. should come up. It has a lifetime warranty and is relatively inexpensive.

 

[BUICKGNX]

OK,
Just checked last night the pressure switch with a multimeter. i set the meter at 2000 hms as stated in the instructions manual. with the battery disconnected, i proned the black wire and red to pressure switch to all terminals. it read 0.002. i guess its ok and functional. I also checked the power master motor/pump and with the battery disconnected it read nothing. Please if any one can help me. Trying to figure out what the cause of my brake problem is.

Thanks guys

Mike

 

[MistaScott]

You should be reading in ohms for the motor test. I'd try to adjust the measurement so you aren't reading the thousands place (0.002).
Since the motor is not running I would pay particular attention to confirming this at the motor electrical connector:

Booster Motor (Ohmmeter)
1. Meter should show resistance between Motor "B" and "D".
2. Meter should show open circuit between Motor "A" and "C".
3. Replace motor and assembly if 1 & 2 are not true.

If the motor is shot, you would need a replacement unit, $143.00 plus $61.00 core charge at Autozone.