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Griner t/brake UPDATE #2568782
10/24/18 11:51 AM
10/24/18 11:51 AM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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My Griner LBA brake sometimes won't hold the car on the starting line. Sometimes it works OK. Always feels like it engages, but sometimes the car will roll thru the beams.
Where do I start the diagnostics?
bow


Last edited by cagebob1; 11/03/18 06:09 PM.
Re: Griner t/brake [Re: cagebob1] #2568817
10/24/18 12:35 PM
10/24/18 12:35 PM
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Lubbock,TX
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DavidDean Offline
top fuel
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Check your line pressure. My 904 is about 175. I dont remember what a 727 is off the top of my head.

Re: Griner t/brake [Re: cagebob1] #2568818
10/24/18 12:39 PM
10/24/18 12:39 PM
Joined: Jan 2011
Posts: 667
st.louis,mo.
dart games Offline
mopar
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st.louis,mo.
do you bring it up to 2000 rpm when you stage

Re: Griner t/brake [Re: cagebob1] #2568838
10/24/18 01:10 PM
10/24/18 01:10 PM
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fla
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ss/la Offline
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fla
check your rear band adjustment

Re: Griner t/brake [Re: ss/la] #2568888
10/24/18 02:22 PM
10/24/18 02:22 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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yes, I stage it at 2000 rpms or a little more. Please keep the suggestions coming.
bow

Re: Griner t/brake [Re: cagebob1] #2568902
10/24/18 02:42 PM
10/24/18 02:42 PM
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Portage,michigan
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Mine engaged just off idle (1100-1200)
Something else going if it takes 2k and still sometimes doesnt hold


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Re: Griner t/brake [Re: cagebob1] #2568912
10/24/18 02:55 PM
10/24/18 02:55 PM
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Fulton County, PA
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CMcAllister Offline
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High clutch slipping. High gear ok?


If the results don't match the theory, change the theory.
Re: Griner t/brake [Re: cagebob1] #2569095
10/24/18 08:32 PM
10/24/18 08:32 PM
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
slantzilla Offline
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I had trouble with mine once. It was shifter cable adjustment.


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Re: Griner t/brake [Re: cagebob1] #2569119
10/24/18 09:23 PM
10/24/18 09:23 PM
Joined: Mar 2011
Posts: 3,056
Michigan
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A727Tflite Offline
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Check the switch for resistance - make sure wiring is not damaged.
Had a Turbo Action unit do the same and the switch was bad.

Re: Griner t/brake [Re: CMcAllister] #2569179
10/24/18 11:51 PM
10/24/18 11:51 PM
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Phoenix, AZ
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MoparBilly Offline
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Originally Posted By CMcAllister
High clutch slipping. High gear ok?


This is correct.

How long do you have on the trans? Has this been a problem since day one?

My 904 would occasionally do this with a Griner LBA Brake. later it wouln't hold at WOT and I had to chip it down. Eventually high gear failed. We tightened up the High gear clutch pack clearance on rebuild, and added 1 1/2 turns of pressure. Never had a problem in the 5 years since.


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Re: Griner t/brake [Re: MoparBilly] #2569329
10/25/18 12:48 PM
10/25/18 12:48 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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Thanks for all of the input! looks like I have a few things to check. Any more suggestions are welcome.
bow

Re: Griner t/brake [Re: cagebob1] #2569586
10/26/18 12:13 AM
10/26/18 12:13 AM
Joined: May 2003
Posts: 13,182
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Whenever I’d get creep with my Griner I knew it was freshen time. More times than not the teflon seals I use on the reaction shaft support we’re going away. Fresh trans would lock at 1000rpm

Re: Griner t/brake UPDATE [Re: cagebob1] #2573531
11/03/18 06:12 PM
11/03/18 06:12 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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OK, Maybe I really am as dumb as a box of hair! I just tryed checking my line pressure at the center port on the pass side .... no pressure in any gear!
Where do you check line pressure with this valve body?
bow

Re: Griner t/brake UPDATE [Re: cagebob1] #2573537
11/03/18 06:23 PM
11/03/18 06:23 PM
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Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
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Most current transbrake VB's have the center pressure tap blocked off, only way to check line pressure is at the front tap with the trans in high gear.


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Re: Griner t/brake UPDATE [Re: John_Kunkel] #2573538
11/03/18 06:29 PM
11/03/18 06:29 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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I was getting ready to try that and see what happens. Thank you for your assistance.
bow

Re: Griner t/brake UPDATE [Re: cagebob1] #2575500
11/07/18 07:51 PM
11/07/18 07:51 PM
Joined: Jan 2003
Posts: 1,599
westerly, ri. usa
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440lebaron Offline
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reverse servo with brake on should be 180lbs


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Re: Griner t/brake UPDATE [Re: 440lebaron] #2575506
11/07/18 08:01 PM
11/07/18 08:01 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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Another thing to check ... good to know! Haven't had much time recently ... plumbing problems in the house. panic
bow

Re: Griner t/brake UPDATE [Re: cagebob1] #2579923
11/18/18 06:45 PM
11/18/18 06:45 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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Mesa, AZ
Finally got a chance to look at this. The pressure in the rear servo is about 135psi in low gear, then drops to about 125psi with the brake engaged. Will turning up the pressure fix this? or do I have a deeper problem that is going to require trans disassembly and inspection? As always, thank you for your assistance.
bow

Re: Griner t/brake UPDATE [Re: cagebob1] #2582368
11/24/18 02:16 PM
11/24/18 02:16 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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Thought I would update this, just in case anyone else is a nube to the transbrake world. Turned the line pressure up to 165 lbs, seemed to cure the holding problem ... but I think another problem has reared it's ugly head. engaging the transbrake causes line pressure in the rear servo to drop to 75 psi. Am I correct in assuming that there is a problem in the front drum/clutchpack? Could it be in the rear clutchpack? Guidance is always appreciated.
bow

Re: Griner t/brake UPDATE [Re: cagebob1] #2586730
12/03/18 07:37 PM
12/03/18 07:37 PM
Joined: Dec 2009
Posts: 303
Mesa, AZ
cagebob1 Offline OP
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"reverse servo with brake on should be 180lbs"
Are we still talking about a 727 ? I've seen those numbers tossed about for a glide.
Any and all input is welcome
bow







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