I installed a PB Booster on my drum brake '68 coupe. Installation went OK, bled brakes, went OK. It feels like the booster is not functioning. Brake pedal feels OK, 15" of vacuum @ idle, good suction at vacuum port on booster. 'Stopping' effect just feels like standard braking- no power boost effect. Sound like I just got a bad (new) booster?
Neil Hoppe
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1968's: Best of the Best:
1968 GT/CS J Code
Its a "don't have to change the pedal" aftermarket unit. The pedal geometry with the included adapter is OK- Ive done this conversion before with no problem.
Neil
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1968's: Best of the Best:
1968 GT/CS J Code
GT please tell me more because i have one as well and i am highly having problems, the third one and now they are not going to honor their warranty it seems
15" of vacuum sounds low for a fairly stock motor, usually only that low if you have a massive cam. You may have a vacuum leak and the motor isn't building enough vacuum to power the booster. Try capping off the booster port from the intake and see what the vacuum is. If it's higher capped then I suppose the diaphragm in the booster is bad and leaking vacuum.
Jon
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"If it ain't broke, I haven't fixed it yet"
-Jon-
1967 Coupe 333ci CandyApple Red w/red int., AOD, 9" 3.50:1, Front PDB
'09 Warriors In Pink V6 w/glass roof - wife's Stang
Hi,
I would first check the booster to see if it will hold a vacuum. That will tell you if there are any leaks in it. I agree with JonK, your vac is a little on the low side. If it's due to your cam events, then, add a booster vac canister to supplement your booster vac supply may be in your future. Since you state, you've done this before, then, as 22GT mentioned, the hardware installation is correct?
Just my quick thoughts...God Luck!
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Ken ..
64 1/2 Poppy Red too!, Cvt. Resto-Mod
333 Cu.in. T5z, 3:55, Dual 40 mm DCOE Webers
Performer RPM, CI cam, TFS/TWs, Tri-Ys, Discs w/Shelby Drums
Severna Park, MD
I hooked up my vacuum tester directly to the booster. The booster will not hold ANY vacuum. Disconnected booster vacuum line, plugged it. Manifold pressure @ idle RPM is now 18" instead of 15" vacuum.
The good news: I called Laurel Mountain Mustang and explained my dilemna. (I had actually purchased the unit thru E-Bay in May 2011) I Fax'd them the sales invoice, and they are going to send me a new booster. That's good customer service.
Neil Hoppe
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1968's: Best of the Best:
1968 GT/CS J Code
Last edited by franklinair; 05-10-2012 at 03:26 PM.
I hooked up my vacuum tester directly to the booster. The booster will not hold ANY vacuum. Disconnected booster vacuum line, plugged it. Manifold pressure @ idle RPM is now 18" instead of 15" vacuum.
The good news: I called Laurel Mountain Mustang and explained my dilemna. (I had actually purchased the unit thru E-Bay in May 2011) I Fax'd them the sales invoice, and they are going to send me a new booster. That's good customer service.
Neil Hoppe
Hi,
I'd say, that is excellent customer service. Perhaps, have them test it before it leaves.
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Ken ..
64 1/2 Poppy Red too!, Cvt. Resto-Mod
333 Cu.in. T5z, 3:55, Dual 40 mm DCOE Webers
Performer RPM, CI cam, TFS/TWs, Tri-Ys, Discs w/Shelby Drums
Severna Park, MD
This is vhelpful. I bought (ebay,too) same unit for my 67 around same time. I won't be able to install for several months. I'll keep following this & hope for the best when I getto it!
Gimpy
Quote:
Originally Posted by franklinair
I hooked up my vacuum tester directly to the booster. The booster will not hold ANY vacuum. Disconnected booster vacuum line, plugged it. Manifold pressure @ idle RPM is now 18" instead of 15" vacuum.
The good news: I called Laurel Mountain Mustang and explained my dilemna. (I had actually purchased the unit thru E-Bay in May 2011) I Fax'd them the sales invoice, and they are going to send me a new booster. That's good customer service.
Its a "don't have to change the pedal" aftermarket unit. The pedal geometry with the included adapter is OK- Ive done this conversion before with no problem.
My experience with these is they are no good about 15% of the time. Even when they work, they are not as good as OEM.
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Amateur restorer. (Well, once in a while I have been paid for it)
Well, let me tell the other side of that great customer service at laurel mountain mustang, I purchased the kit around March 31, received Early April, item damaged in shipment, back ordered for new one, finally received end of April i believe, Installed and it was defective, sucking air leak, called and they said back order, I finally received new one end of September. Several months of phone calls and different stories. April - September long time to be back ordered. Just taken car out of storage April this year and now have a new leak on this one as well, I called and now they will not warranty, Said they will call ABS for me, I have had more problems with this kit, more headaches. I explained all problems, which feel on deaf ears. I spent over 2K with them and now need more parts on my other car, not going to spend any more with them until this gets resolved. So everyone has a good experience and so have bad.
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