Powermaster brake help

[viokrome]

I have a 87 gn, the brake light comes on when i press brakes for about a second then goes off, I tried to dpresserize the system with key off 10 pumps then key on the motor runs about 12 seconds. Still get light when brakes are applied. So should I replace the accumulator ball (still original) or master cylinder next? Any ideas would be great!

 

[jcawley3]

could be the ball, could be the pressure switch on top.... that was my issue years ago.... what color is it? black or grey?

 

[GNRick]

Whatever you do, you should do it very soon. Brake light on is not good.

 

[williamsGN]

http://www.gnttype.org/techarea/brakes/PwrMstr.html

 

[BILL HAINES]

accumulator ball ,FLUSH THE SYSTEM,CLEAN THE CHECK VALVE...RELEASE PRESSURE FIRST(PUMP BRAKES 10+TIMES.. GOOD LUCK!!!!

 

[BEATAV8]

All of the above as recommended, and might as well get a fresh pressure switch too. SAVE YOUR O-RINGS. The aftermarket switch and accumulator do not include the correct O-rings.