Disc Brake Conversion Problem

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Oct 15, 2009 | 05:05 PM

#16

'65 Hot Truck

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From: Carrollton, GA

Thank you PROSTOCK, I'd already wondered about the pushrod, haven't been able to get in touch w/ TSM about the master cylinder yet. But, based on my hydraulic experience never really thought the line size entered into it, the only thing that should concevibly affect would be speed of application. The more I think about it, I guess I understand how it could be the M/C. That seems to be the general consensus. Guess I'll try the pushrod and more bleeding 'till i get in touch with TSM about the M/C. If I find anythig out tonight I'll post it A.S.A.P.

Oct 15, 2009 | 07:12 PM

#17

'65 Hot Truck

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From: Carrollton, GA

Update: Got them working!!! Took the '74 pushrod chopped off 1-1/8" and they work perfectly!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

: )

Oct 16, 2009 | 05:21 AM

#18

Pro-Street/StateTK

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From: East Flat Rock NC

'65 Hot Truck

Im glad to see you got your brakes working again , and thanks for posting back and letting us know ! When you get time start a gallery so we can see your truck !

Wally Womack

Oct 16, 2009 | 05:44 AM

#19

ddavidv

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From: Elizabethtown, PA

Quote:

Originally Posted by PROSTOCK

^^^Once the system is completely full of fluid, line size has nothing to do with it....it could be a 4" line and it still wont have any negative affect.

Personal experience assures me this statement is wrong. I tried the larger diameter tubing on my conversion because it made the fittings simpler and it did not work. I could not gain any pressure regardless of bleeding procedure or duration. Changing to the smaller (correct) size tubing solved the problem. Your theory only works if the system is full with no air. If you've got air in the lines and are trying to bleed them, the pedal/pushrod/master cannot move enough volume to fully rid the system of air. You may possibly be able to get around this with a pressure bleeder but they don't really adapt to these vintage master cylinders.