wrong name --- it is not the brake buddy- that is for toads..
I guess this device is called Brake Guard ?? I will have to go find the
reference. The function is right, I just have the wrong name.
gene
>
>As I think more about this, I think the brake buddy might be an answer.
>
>The brake buddy tries to even out the pressure pulses on the brakes as the
>shoes move in and out and the temperature rises. Brake systems have high
>pressures but low volume so the brake buddy is a little pressure dash pot
>that absorbs pressure pulses to keep even pressure on the brakes. It is
>normally connected between the master cylinder and the brakes.
>
>If we put it on the output of the brake lock it should absorb the pressure
>increase caused by the heating of the brake fluid....sort of an expensive
>fix but we would get the advantage of the brake buddy on the brakes as well
>as solve this problem....
>
>gene
>
>>Earlier today I responded to a question from Jerry Lader about a problem
>>with the brake lock that I'd mentioned in my "Trip Report". I had intended
>>my response to go the whole group since I was "fishin'" for comments, but
>>didn't notice it was off net. So here's Jerry's question and my response
>>for y'all to check for faulty logic. Have at it!
>>
>>> >Hi Dave,
>>> >Did I read that you had trouble releasing your brake valve on your recent
>>> >trip? I am very interested in installing a valve like you have. Please
>tell
>>> >me what you found wrong.
>>> >Jerry Lader Cad. Powered Edgemonte(CADDYSHACK)
>>> > hot and humid today in Memphis
>>
>>Response:
>>> As I understand it, the way these things work is related to why they can
>>> also lock up. When the lock is actuated, pressure is already being applied
>>> to the wheel cylinders by having your foot on the brake pedal. The lock
>>> simply prevents that pressure from being returned to the master cylinder
>>> until pressure greater than what is being held back is applied from the
>>> master cylinder side. When that happens, the pressure is the same on both
>>> sides for an instant allowing the valve to retreat and fluid to again flow
>>> in either direction. It locks up, or won't release, when you can't
generate
>>> greater pressure with the pedal.
>>>
>>> I believe this happens when the pressure being held back increases due to
>>> radiated heat along the various brake lines. Both times it occurred, we
>>> were at elevation and set it after pulling a grade and while stopped on
hot
>>> blacktop. When it happens, you have two choices; wait until the lines cool
>>> a little (might be1/2 hour), or crawl underneath and open a bleeder valve.
>>> For us, waiting is the only option.
>>>
>>> I'm not sure anything is really wrong. Its just a circumstance that isn't
>>> present in the lock's normal application.
>>>
>>> This is admittedly theory at this point, but until someone offers a more
>>> plausible explanation, I'm going to assume it to be valid.
>>>
>>> Last, here's what I'm planning to do about it. I'll have by mechanic
>>> install a bleeder valve just after the lock and accessable from under the
>>> driver's side engine compartment door. My wife can the be taught how to
>>> release enough pressure to get us going again. Since we carry brake fluid,
>>> we can check and fill the master cylinder if necessary.
>>>
>>> I hope I haven't confused more than clarified, and that if I'm the one
>>> confused, one of the GMCnet "experts" will straighten me out.
>>>
>>> Dave (advisor/navigator) & Dege (ALL else), '76 Royale, Santa Barbara, CA
>>
>>
>>
>Genef -- 77PB/ore/ca
>GMC MOTORHOME INFORMATION
>mr.erf
>http://www.california.com/~eagle/
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
I guess this device is called Brake Guard ?? I will have to go find the
reference. The function is right, I just have the wrong name.
gene
>
>As I think more about this, I think the brake buddy might be an answer.
>
>The brake buddy tries to even out the pressure pulses on the brakes as the
>shoes move in and out and the temperature rises. Brake systems have high
>pressures but low volume so the brake buddy is a little pressure dash pot
>that absorbs pressure pulses to keep even pressure on the brakes. It is
>normally connected between the master cylinder and the brakes.
>
>If we put it on the output of the brake lock it should absorb the pressure
>increase caused by the heating of the brake fluid....sort of an expensive
>fix but we would get the advantage of the brake buddy on the brakes as well
>as solve this problem....
>
>gene
>
>>Earlier today I responded to a question from Jerry Lader about a problem
>>with the brake lock that I'd mentioned in my "Trip Report". I had intended
>>my response to go the whole group since I was "fishin'" for comments, but
>>didn't notice it was off net. So here's Jerry's question and my response
>>for y'all to check for faulty logic. Have at it!
>>
>>> >Hi Dave,
>>> >Did I read that you had trouble releasing your brake valve on your recent
>>> >trip? I am very interested in installing a valve like you have. Please
>tell
>>> >me what you found wrong.
>>> >Jerry Lader Cad. Powered Edgemonte(CADDYSHACK)
>>> > hot and humid today in Memphis
>>
>>Response:
>>> As I understand it, the way these things work is related to why they can
>>> also lock up. When the lock is actuated, pressure is already being applied
>>> to the wheel cylinders by having your foot on the brake pedal. The lock
>>> simply prevents that pressure from being returned to the master cylinder
>>> until pressure greater than what is being held back is applied from the
>>> master cylinder side. When that happens, the pressure is the same on both
>>> sides for an instant allowing the valve to retreat and fluid to again flow
>>> in either direction. It locks up, or won't release, when you can't
generate
>>> greater pressure with the pedal.
>>>
>>> I believe this happens when the pressure being held back increases due to
>>> radiated heat along the various brake lines. Both times it occurred, we
>>> were at elevation and set it after pulling a grade and while stopped on
hot
>>> blacktop. When it happens, you have two choices; wait until the lines cool
>>> a little (might be1/2 hour), or crawl underneath and open a bleeder valve.
>>> For us, waiting is the only option.
>>>
>>> I'm not sure anything is really wrong. Its just a circumstance that isn't
>>> present in the lock's normal application.
>>>
>>> This is admittedly theory at this point, but until someone offers a more
>>> plausible explanation, I'm going to assume it to be valid.
>>>
>>> Last, here's what I'm planning to do about it. I'll have by mechanic
>>> install a bleeder valve just after the lock and accessable from under the
>>> driver's side engine compartment door. My wife can the be taught how to
>>> release enough pressure to get us going again. Since we carry brake fluid,
>>> we can check and fill the master cylinder if necessary.
>>>
>>> I hope I haven't confused more than clarified, and that if I'm the one
>>> confused, one of the GMCnet "experts" will straighten me out.
>>>
>>> Dave (advisor/navigator) & Dege (ALL else), '76 Royale, Santa Barbara, CA
>>
>>
>>
>Genef -- 77PB/ore/ca
>GMC MOTORHOME INFORMATION
>mr.erf
>http://www.california.com/~eagle/
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
