Author Topic: Transbrake  (Read 399 times)

Offline spitzerscott

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Transbrake
« on: May 30, 2018, 02:59:01 PM »
What are some common causes of a "part time" transbrake?  TCI shorty glide in RED. 

Online opa1

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Re: Transbrake
« Reply #1 on: May 30, 2018, 03:33:47 PM »
What are the symptoms? Too low of rpm @ apply and or low pump pressure can cause a bunch of problems. Sticking modulator valve, bad solenoid, electrical? Band adjustment?
« Last Edit: May 30, 2018, 03:35:40 PM by opa1 »

Offline bikeguy307

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Re: Transbrake
« Reply #2 on: May 30, 2018, 07:27:26 PM »
If you are talking complete loss of transbrake it almost has to be valve and or solenoid related. If you have a release spring that fit in a pocket in the valve check it deformation. I have them fold over instead of going in the pocket keeping the valve from moving all the way in.

Offline spitzerscott

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Re: Transbrake
« Reply #3 on: May 31, 2018, 02:50:14 PM »
It is not a complete loss,  He can't get it to work on the starting line, but if he stops on return road and tries it works. If we press the button in the garage we hear the solenoid click and we release we can hear it click again when the timer runs out.  At what RPM should he be at when he engages it?  First car we ever had with a transbrake so don't assume I know anything about it.    Transbrake 101 for dummies.

Offline spitzerscott

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Re: Transbrake
« Reply #4 on: June 02, 2018, 08:58:58 AM »
Any Suggestions?

Offline wideopen231

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Re: Transbrake
« Reply #5 on: June 02, 2018, 02:01:51 PM »
Biring rpm up as high as fell comfortable without having car move and try brake. If it works them more than likley pump is weak, You could install a pressure gauge and see what pressure you have at what rpm. Pull trans brake,valve(pay attention to direction) look at spring and see if slides freely in valvebody.

Check band adjustment and see if correctly set.


Check cable  for shifter to transmission lever to make sure its fully in low gear.Have seen one or two where its clicks in but lever is about half in half out.
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Offline bikeguy307

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Re: Transbrake
« Reply #6 on: June 02, 2018, 04:51:17 PM »
Ok so I locks the break while tried on the return road? Are you just pushing the button and it holds at idle or are you putting it at launch rpms? If it releases, or creeps/drives throught the transbrake when going up towards launch rpm then there is some sort of leak in the reverse circuit from the transbrake valve to the piston. This could be a worn valve, a blown gasket, or a bad seal on the piston. As wideopen said make sure the shifter is adjusted correctly. If you have a reverse pressure port in your case check pressure there and compare it to the low pressure port. If it is a total release of the brake while going up to launch rpm (the brake releases before the solenoid is de-engerized) suspect a weak solenoid. Keep us up on your findings.

Offline spitzerscott

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Re: Transbrake
« Reply #7 on: June 03, 2018, 06:46:02 AM »
Thanks guys now I know more than I did. I have a guy coming over later that has knowledge about transbrakes  to try to show me some things, at least now I can ask some good questions.   By the way I did leave one small item out, this tranny set for 10 years before I started running it.  Could it just be sticky?  It looks like the solenoid just unscrews out of the case, is that true?
« Last Edit: June 03, 2018, 07:31:08 AM by spitzerscott »

Offline bikeguy307

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Re: Transbrake
« Reply #8 on: June 05, 2018, 10:39:09 AM »
Yes the solenoid unscrews. Sticking is a possibility but Im thinking it would go away after it cycles a few times.

Keep us posted, knowledge is power.

Offline spitzerscott

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Re: Transbrake
« Reply #9 on: June 07, 2018, 05:05:28 PM »
Have not tried it yet but...……when we were playing with it, it had a voltage draw when other systems were turned on.  So the delay box was not getting full 12V.  Rewired and am looking forward to try it this weekend.   Stay Tuned!