Soft pedal

[GNRick]

I replaced the power master and now the brake pedal is too soft. There are no leaks and I bled them both at the master cylinder and at the 4 corners. I attended a seminar once at Bowling Green, where Richard Clark said if you tighten a screw somewhere on the powermaster, your brakes will throw you through the windshield. I don't remember where he said that screw is located, and I couldn't find any screws on the P/M. Mechanic said to maybe adjust the rear shoes, but they worked better before I replaced the P/M. Any suggestions? Could the new master cylinder be at fault? Also, it came with the new style accumulator. Could the old style work better? Thanks.

 

[POWERBRAKEBOB]

Hydroboost Vs Vacuum Vs Powermaster

I Have Rebuilt Many Powermasters, And I Can't Recall Any Screw In It At All. We Have Modified The Control Valve Inside To Increase The Valve Opening, Which Works Well. But The Weakness In The P/m Is The 12v Motor/pump. One Advantage Of The Hydroboost Is That Any Piston Size Master Can Be Bolted To It, From 7/8" To 1.625". It Uses Conventional Style Gm Masters. The Power Master Comes With A 1.250" Piston Diameter, But Must Use A Higher Positioned Pin On The Pedal To Gain The Leverage To Push It. That Is Why The Pedal Is So Hard To Push, When The P/m Motor Fails. The Regal Master Is 24mm Or 15/16" And The Pm Is 1.250". The Spongy Pedal Can Be Air In The Calipers., Loose Wheel Bearings, Or Rear Brake Shoe Adj. The P/m Is Will Bleed Itself, Just By Driving, The Air Bubbles Will Work Back To The Reservoir.

 

[GNRick]

The mechanic adjusted both sides in the rear and now they work great. On one side, a spring was put in wrong. He said they are supposed to be self adjusting, but rarely work that way. Do you have any master cylinders for the powermaster already rebuilt? I bought one off ebay.