Guest tv56 Posted September 3, 2005 Share Posted September 3, 2005 Hello again. Today's question is with regards to the power brakes on my56 special. Lots of pedal, but little stopping power. I checked thelinings which look to be new. I can't find any vaccum leaks, vaccumcan inside the drivers fender well looks to be in good condition, nofluid leaks i can see... Car stops, but not like it has power brakes.Pedal is hard too.Would anyone have some suggestions on where to start?Thanks!Tom V Link to comment Share on other sites More sharing options...
Guest sixpack2639 Posted September 3, 2005 Share Posted September 3, 2005 Sounds like your booster isn't working. Link to comment Share on other sites More sharing options...
Roadhog Posted September 3, 2005 Share Posted September 3, 2005 Usually the diaphram in the booster is leaking and not "assisting" in applying pressure to the hydraulic cylinder. You can detect a vacuum leak in a diaphram by hooking up a tach to the engine and with engine running shut off vacuum supply to booster. Any change in engine RPM means you have a vacuum leak in power brake unit or line, resevoir. Note: to shut off vacuum supply you need to "plumb in" a small "shut off" valve in the vacuum line.) Rebuild kits are available and not too difficult to install although I did have to make a "special Tool" to rebuild mine. Link to comment Share on other sites More sharing options...
Guest tv56 Posted September 4, 2005 Share Posted September 4, 2005 Thanks! Link to comment Share on other sites More sharing options...
Guest tv56 Posted September 4, 2005 Share Posted September 4, 2005 Thanks! I'll try that. Link to comment Share on other sites More sharing options...
Bhigdog Posted September 5, 2005 Share Posted September 5, 2005 You say the linings appear new. If they are like new and not glazed and fully contacting the drum they will feel exactly as you described. I had the same problem with a 57. I even sent the brake booster back to the rebuilder as defective. It turned out the new linings were too hard and not seating. New softer linings cured the problem after a few miles of break in.To test booster operation.....With engine off, pump brakes several times to deplete vacuum tank. Hold brake pedal down while you start engine. If booster is functioning properly you will feel the pedal move down slightly as engine vacuum builds........Bob. Link to comment Share on other sites More sharing options...
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