| Block of wood under brake pedal? [message #62794] |
Mon, 02 November 2009 13:27  |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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I remember reading that bleeding brakes without a piece of wood under the brake pedal would casue a tear and resultant MC leak, but couldn't locate it during a search. Can anyone point me to that? Thank you in advance!
Also, why would the brake system be designed such that it results in damage to the MC that way? It would seem that someone would actually need that extra couple inches of travel in an emergency. It doesn't make sense. Mismatch of replacement parts perhaps?
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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| Re: [GMCnet] Block of wood under brake pedal? [message #62795 is a reply to message #62794] |
Mon, 02 November 2009 13:34  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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This was a comment that Jim Bounds made on bleeding brakes. It is a
good choice at you can tear up the o-rings in the master by pressing
it all the way down and especially on used one that is in the coach.
J.R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
>
> I remember reading that bleeding brakes without a piece of wood
> under the brake pedal would cause a tear and resultant MC leak, but
> couldn't locate it during a search. Can anyone point me to that?
> Thank you in advance!
>
> Also, why would the brake system be designed such that it results in
> damage to the MC that way? It would seem that someone would actually
> need that extra couple inches of travel in an emergency. It doesn't
> make sense. Mismatch of replacement parts perhaps?
> --
> Larry Engelbrecht
> '73 26' ex-Glacier
> TZE063V100319 030773
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: Block of wood under brake pedal? [message #62796 is a reply to message #62794] |
Mon, 02 November 2009 13:44 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| LarryInSanDiego wrote on Mon, 02 November 2009 13:27 |
I remember reading that bleeding brakes without a piece of wood under the brake pedal would casue a tear and resultant MC leak, but couldn't locate it during a search. Can anyone point me to that? Thank you in advance!
Also, why would the brake system be designed such that it results in damage to the MC that way? It would seem that someone would actually need that extra couple inches of travel in an emergency. It doesn't make sense. Mismatch of replacement parts perhaps?
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It's not about a design issue but a corrosion issue. Over time the areas of the MC that are not regularly stroked by the MC piston will develop deposits and corrosion that can damage the piston seals. It would probably not prevent a one time severe brake application but could result in a sinking pedal after that.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: Block of wood under brake pedal? [message #62798 is a reply to message #62796] |
Mon, 02 November 2009 13:54 |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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Ahh, thank you. That makes perfect sense.
Last weekend I had the brake pedal go almost to the floor and the red light came on. Yesterday I checked the MC to find the rear chamber on my '73 was dry. I filled it up and bled it to see if I could locate where the leak was. That's when I saw fluid dripping from the rear bottom of the MC.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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