| Power Brake Booster [message #81873] |
Sun, 25 April 2010 21:20  |
rscortezzo
Messages: 49
Registered: January 2007
Location: Green Valley Arizona/ Flo...
Karma: 0
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I would like to thank those who responded to my
converter and Onan starter problems. You guys are
the best.
I know the brakes are not the best on these GMC's. I have
enough brakes to lock-up the wheels but don't have much pedal.
I have adjusted the brakes, new calipers and new brake shoes
in the rear, I also flushed the brakes with new fluid.
Any ideas?
Now, I would like to know if there is any kind of test
I can perform to test the booster.
Rich Cortezzo
Green Valley AZ
1978 Eleganza II
F389018
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| Re: Power Brake Booster [message #81880 is a reply to message #81873] |
Sun, 25 April 2010 21:43  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| rscortezzo wrote on Sun, 25 April 2010 21:20 |
Now, I would like to know if there is any kind of test
I can perform to test the booster.
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Disconnect the vacuum line from the booster to the manifold and plug the opening to the manifold. Pump the brakes to bleed off any vacuum trapped in the booster, then try the brakes. Reconnect the vacuum lines. You should see a big difference in the force required to apply the brakes. If not you have a suspect booster. CAUTION - be very cautious doing this on the road.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: Power Brake Booster [message #81898 is a reply to message #81873] |
Mon, 26 April 2010 07:00 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| rscortezzo wrote on Sun, 25 April 2010 22:20 |
I would like to thank those who responded to my converter and Onan starter problems. You guys are the best.
I know the brakes are not the best on these GMC's. I have enough brakes to lock-up the wheels but don't have much pedal.
I have adjusted the brakes, new calipers and new brake shoes in the rear, I also flushed the brakes with new fluid.
Any ideas?
Now, I would like to know if there is any kind of test I can perform to test the booster.
|
Rich,
Steve's booster test is good, but in the mean time, I would like to hear what you mean by "don't have much pedal".
Because is you mean you don't have much travel left before the pedal travel is gone, that is most likely not a booster problem.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Power Brake Booster [message #81917 is a reply to message #81898] |
Mon, 26 April 2010 09:55 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| mcolie wrote on Mon, 26 April 2010 07:00 |
Rich,
Steve's booster test is good, but in the mean time, I would like to hear what you mean by "don't have much pedal".
Because is you mean you don't have much travel left before the pedal travel is gone, that is most likely not a booster problem.
Matt
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The first thing I would check if I had low pedal is the adjustment of the rear brake shoes. If the automatic adjusters are not working or have not been sufficiently activated lately (or were removed) the wheel cylinders will take more fluid and give a low pedal. The solution is to do a manual adjustment. Note this only applies if the rear brakes have not been converted to discs.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Power Brake Booster [message #82073 is a reply to message #81917] |
Tue, 27 April 2010 09:08 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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A small adjustment back there sure makes a big difference in the
amount of pedal you have in the front!
On Mon, Apr 26, 2010 at 7:55 AM, Steve Southworth <midlf@centurytel.net> wrote:
>
>
> mcolie wrote on Mon, 26 April 2010 07:00
>> Rich,
>> Steve's booster test is good, but in the mean time, I would like to hear what you mean by "don't have much pedal".
>> Because is you mean you don't have much travel left before the pedal travel is gone, that is most likely not a booster problem.
>>
>> Matt
>
>
> The first thing I would check if I had low pedal is the adjustment of the rear brake shoes. If the automatic adjusters are not working or have not been sufficiently activated lately (or were removed) the wheel cylinders will take more fluid and give a low pedal. The solution is to do a manual adjustment. Note this only applies if the rear brakes have not been converted to discs.
>
> --
> Steve Southworth
> 1974 Glacier TZE064V100150
> Palmyra WI
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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