Technical > Dan Dishon's Transmission Den
Transbrake
wideopen231:
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.
bikeguy307:
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.
spitzerscott:
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?
bikeguy307:
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.
spitzerscott:
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!
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