| [GMCnet] Brake problem [message #206332] |
Mon, 29 April 2013 10:33  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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Hi Darrel,
In addition to all the good advice so far, also check the length of your MC push rod. I had occasion recently to check mine with a dab of clay and found it more than .200" short. It should be about .020" short. I have no idea when that rod was installed or what may have been changed since, but that much too short means my MC has not been pushing the correct amount of fluid. That can lead to all kinds of weird brake stuff. Easy to do while you have everything open. You can make a new rod the correct length from a piece of 5/16" steel rod. KenH and others show various ways of measuring rod length but a dab of Playdough, modeling clay or plumbers putty works, too.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
Http://jerrywork.com
541-592-5360
Cell 541-499-1027
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Brake problem [message #271378 is a reply to message #206332] |
Sat, 07 February 2015 21:17  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
Just as I had called Ken Frey about your brake problems to clarify what his involvement was I gave JimB a call. He noted that before
you left his shop you went for a test ride with one of Jim's guys and noted that the brakes were OK.
According to Jim you called him and advised him of your problems on the way to Tampa. He asked you to bring it back to him but you
wanted to have the shop in Tampa fix it. Jim noted that he provided the part numbers of the spring and spring kit. Jim also noted
that the brake shoes he installed were not carbon metallic.
Finally Jim noted that this incident has caused him to change his policy when he works on brakes. From this point onwards whenever
he does any work on brakes he will install a new brake spring kit and adjusters. This will be added to his current policy which is
unless a customer knows when the flexible brake lines were replaced they get changed as well.
JimB noted that the sensitized booster Ken removed from your GMC has arrived and it will be taken apart and inspected by the guy
that builds them for him.
BTW the two statements below are confusing:
"Professional brake shop did the work."
"fixing my screw ups on the rear brakes when I reinstalled them."
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Advanced Concept Energy Solutions
I live in northern NJ the most populous state in the union. Traffic is dense and many of the drivers are even more dense! I live
less than a mile from Mercedes and BMW headquarters so there are loads of vehicles that literally can stop on a dime and they do.
There is no fun driving RV's around here. I try to sneak out of the area at low traffic times. I drove this coach 1300 miles from
Tampa with a fresh brake job from Jim Bounds shop. The trip started out OK and jus thought the brakes had to break in. Had wheels
pulled and readjusted breaks along the way because TPS system installed by Jim B showed overheating of tires. Professional brake
shop did the work. By the time I got to NJ it took a quarter mile to stop coach from 60 mph. When I get the coach back from Ken, if
the snow ever stops, I will have driven 100 miles and will ride the brakes to get the most wear. The carbon metallic shoes that Jim
B installed and I replaced out of desperation showed very little wear at the middle. The new shoes are from a speed shop brake
company in California. When I get home I will see how the brakes are. Remember this coach has a two foot stretch and about 1000# of
solid steel welded like a cow catcher under the radiator. Lots of extra weight! If it doesn't stop well after I am seriously
considering a hydro boost system that Jim K shows. Thanks for all the input and thought everyone here put into this. More opinions
and input lead to better conclusions and ultimately to better results. I will post again after I drive it home. Ken also installed
the second new power booster and the third master cylinder so he wasn't happy with just fixing my screw ups on the rear brakes when
I reinstalled them.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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